It is believed that HERVs are the result of ancient viral infections. A number of HERVs have maintained some functionality and still contain intact open reading frames (ORF’s) which code for fully functional proteins. HERV-W is one of these endogenous retroviruses. Over the last few years several research projects have suggested that HERV-W may be involved with multiple sclerosis, bipolar disorder, schizophrenia, autism, and various tumors. The presence of HERV-W RNAs, proteins, and virions has been detected in association with these diseases.
It is believed that HERVs are the result of ancient viral infections. A number of HERVs have maintained some functionality and still contain intact open reading frames (ORF’s) which code for fully functional proteins. HERV-W is one of these endogenous retroviruses. Over the last few years several research projects have suggested that HERV-W may be involved with multiple sclerosis, bipolar disorder, schizophrenia, autism, and various tumors. The presence of HERV-W RNAs, proteins, and virions has been detected in association with these diseases. This power point presentation was created to be used in conjunction with the associated paper.
SARS2 CoVID-19 is so far the latest endemic that has hit the humanity. This presentation is a sincere approach to understand about this class of viruses and the methods that can be used to prevent their further upgradation or genetic modification.
This document discusses the molecular biology of hepatitis C virus (HCV). It describes HCV's structure, including its genome and genes that encode structural and non-structural proteins. These proteins and their roles in HCV's lifecycle are explained. The document also discusses HCV genotypes, mutations that contribute to its genetic diversity, and molecular targets for new antiviral drugs against HCV proteins and RNA. Resistance to direct antiviral drugs is a concern, as HCV can rapidly develop mutations due to its high replication rate and lack of a DNA stage. Understanding HCV's molecular biology is important for research, treatment, and developing new antiviral therapies.
A brief exploration of the way some modern viruses act and ancient viruses have acted to benefit their hosts - particularly humans - today and through evolutionary history, by various means (such as targeted destruction of pathogenic bacteria and introduction of new genetic material).
The document discusses malaria, which is caused by Plasmodium parasites transmitted via mosquito bites. It outlines the life cycle and species of Plasmodium that cause malaria in humans. The presentation summarizes techniques used to study malaria parasites in vitro, including culturing isolates, examining blood smears, and assessing drug sensitivity. Genetic analysis of field isolates by PCR targeting msp1 and msp2 genes showed changes in alleles present over time in culture. In vitro culture allows studying parasite growth and drug resistance profiles.
Viral apoptotic mimicry is when viruses expose phosphatidylserine (PS) on their surface to mimic apoptotic cells and hijack the host cell's apoptotic clearance machinery. PS exposure allows viruses to bind to PS receptors on host cells and be endocytosed. Many viruses use classic apoptotic mimicry by directly exposing PS. Others use non-classic mimicry by mimicking PS receptors like Gas6. Targeting PS is a potential antiviral strategy, as antibodies against PS can opsonize viruses and induce immune clearance. However, more research is needed to fully understand the mechanisms and in vivo relevance of viral apoptotic mimicry.
It is believed that HERVs are the result of ancient viral infections. A number of HERVs have maintained some functionality and still contain intact open reading frames (ORF’s) which code for fully functional proteins. HERV-W is one of these endogenous retroviruses. Over the last few years several research projects have suggested that HERV-W may be involved with multiple sclerosis, bipolar disorder, schizophrenia, autism, and various tumors. The presence of HERV-W RNAs, proteins, and virions has been detected in association with these diseases. This power point presentation was created to be used in conjunction with the associated paper.
SARS2 CoVID-19 is so far the latest endemic that has hit the humanity. This presentation is a sincere approach to understand about this class of viruses and the methods that can be used to prevent their further upgradation or genetic modification.
This document discusses the molecular biology of hepatitis C virus (HCV). It describes HCV's structure, including its genome and genes that encode structural and non-structural proteins. These proteins and their roles in HCV's lifecycle are explained. The document also discusses HCV genotypes, mutations that contribute to its genetic diversity, and molecular targets for new antiviral drugs against HCV proteins and RNA. Resistance to direct antiviral drugs is a concern, as HCV can rapidly develop mutations due to its high replication rate and lack of a DNA stage. Understanding HCV's molecular biology is important for research, treatment, and developing new antiviral therapies.
A brief exploration of the way some modern viruses act and ancient viruses have acted to benefit their hosts - particularly humans - today and through evolutionary history, by various means (such as targeted destruction of pathogenic bacteria and introduction of new genetic material).
The document discusses malaria, which is caused by Plasmodium parasites transmitted via mosquito bites. It outlines the life cycle and species of Plasmodium that cause malaria in humans. The presentation summarizes techniques used to study malaria parasites in vitro, including culturing isolates, examining blood smears, and assessing drug sensitivity. Genetic analysis of field isolates by PCR targeting msp1 and msp2 genes showed changes in alleles present over time in culture. In vitro culture allows studying parasite growth and drug resistance profiles.
Viral apoptotic mimicry is when viruses expose phosphatidylserine (PS) on their surface to mimic apoptotic cells and hijack the host cell's apoptotic clearance machinery. PS exposure allows viruses to bind to PS receptors on host cells and be endocytosed. Many viruses use classic apoptotic mimicry by directly exposing PS. Others use non-classic mimicry by mimicking PS receptors like Gas6. Targeting PS is a potential antiviral strategy, as antibodies against PS can opsonize viruses and induce immune clearance. However, more research is needed to fully understand the mechanisms and in vivo relevance of viral apoptotic mimicry.
Nucleosome maps of the human Cytomegalovirus genome reveal a temporal switch ...Andres Ramirez
This study investigated the role of the human cytomegalovirus (hCMV) IE protein in nucleosome organization and chromatin structure and function during viral infection. The results showed that hCMV infection causes massive changes to nucleosome organization across the viral genome. Specifically, it was found that (1) IE1 protein expression leads to temporal changes in nucleosome organization dependent on IE1, (2) IE1 expression affects nucleosome occupancy across the hCMV genome, and (3) there is a negative correlation between IE1-dependent changes in nucleosome organization and gene expression. The study provides new insights into how hCMV manipulates chromatin structure to facilitate viral replication.
Gene therapy aims to correct genetic defects by transferring a functional copy of the gene into cells. Various viral and non-viral vectors can be used to deliver therapeutic genes, with viruses being very efficient at gene transfer due to their ability to integrate into the host cell genome. Common viral vectors include adenovirus, retrovirus, lentivirus, adeno-associated virus, and herpes simplex virus. The choice of vector depends on factors like titers achievable, ability to infect dividing and non-dividing cells, immunogenicity, and tissue tropism.
This document summarizes retroviruses and HIV. It discusses the discovery and classification of retroviruses. The structure of retroviruses includes a spherical capsid containing two copies of RNA and viral enzymes. The retrovirus lifecycle includes early reverse transcription of RNA to DNA and later integration into the host genome and assembly of new virions. HIV causes AIDS and was isolated in 1983. It is a global pandemic transmitted sexually or through blood. Treatment includes antiretroviral drugs that target reverse transcriptase, protease, entry, and integration. Prevention focuses on safe sex practices, mother-to-child transmission prevention, and pre-exposure prophylaxis.
A presentation on dengue virus structure, how the virus attacks and spreads in the body, role of heterocyclic drugs in inhibiting the virus and our experiments on the subject.
This document reviews oncogenic, or cancer-causing, viruses. It aims to highlight the distribution and epidemiology of viruses associated with cancer. Several viruses are known to or suspected of causing cancer in humans, including human papillomavirus, Epstein-Barr virus, hepatitis B and C viruses, human herpesvirus 8, human immunodeficiency virus, and human T-lymphotropic virus 1. Oncogenic viruses are divided into DNA and RNA viruses. They cause cancer through various mechanisms during viral replication, including activating oncogenes and causing mutations. The prevalence of viral infections worldwide that are associated with cancer varies by virus and region. Certain virus-induced cancers also have high rates globally, such
This document covers molecular genetics and genetic engineering, including DNA structure and replication, protein synthesis through transcription and translation, the genetic code, the human genome and its uses for diagnosis, therapy and research. It also discusses genetic engineering techniques like PCR and their uses in research, forensics and testing, as well as risks and applications in biotechnology for agriculture like GMOs and in biomedicine like gene therapy and production of human substances.
The document discusses severe combined immunodeficiency (SCID) caused by adenosine deaminase (ADA) deficiency. It notes that ADA deficiency accounts for 20% of SCID cases and is the most severe form, affecting both cell-mediated and humoral immunity. Without treatment, ADA-deficient individuals die from infections within the first year of life. The most successful treatments are bone marrow transplantation or enzyme replacement therapy with polyethylene glycol-modified bovine ADA.
This document provides a summary of Cecilia Frecha's education and professional experience. It lists her PhD in European PhD from the University of Granada in Spain, as well as a Diploma of Advanced Studies from Instituto de Parasitologia y Biomedicina in Granada. Frecha has held several research positions including as a Scientific Researcher at CONICET in Argentina and has received fellowships from the International Agency for Research on Cancer and Ecole Normale Superieure de Lyon. She has over 15 publications in scientific journals and a book chapter focusing on in vivo gene delivery.
This document discusses research on the mechanism of translation initiation on the genomic RNA of Cadicivirus A, a naturally occurring dicistronic picornavirus. Cadicivirus A has a dicistronic genome containing two open reading frames separated by an intergenic region that functions as an internal ribosomal entry site (IRES). The researchers investigated the structure of the 5'UTR IRES using SHAPE analysis, finding it closely resembled the structure of the poliovirus IRES. They showed the 5'UTR IRES could drive translation in rabbit reticulocyte lysate and required the canonical initiation factor eIF4A. Toeprinting analysis was used to study 48S complex formation on the IRES
This document discusses the history and science of organ transplantation. It begins with a brief history, highlighting Nobel Prize-winning discoveries such as the first successful organ transplant between twins in 1954. It then covers key topics like the major histocompatibility complex and mechanisms of graft rejection, such as acute cellular rejection mediated by T cells. The types of transplantation are defined, from autologous to xenogeneic grafts. Prevention of rejection involves tissue typing, immunosuppression, and vaccination. Complications like graft-versus-host disease are also summarized.
In the past 10 years, there has been tremendous progress made in the field of gene therapy. Effective
treatments of Leber congenital amaurosis, hemophilia, and spinal muscular atrophy have been largely based on
the efficiency and safety of adeno-associated vectors. Myocardial gene therapy has been tested in patients with
heart failure using adeno-associated vectors with no safety concerns but lacking clinical improvements. Cardiac
gene therapy is adapting to the new developments in vectors, delivery systems, targets, and clinical end points and
is poised for success in the near future
Severe combined immunodeficiency (SCID) is a genetic disorder characterized by the absence of functional T lymphocytes and B lymphocytes, resulting in impaired adaptive immune system. There are several known types of SCID caused by mutations in different genes. The most common treatment is bone marrow transplantation, with success seen in transplants done in early infancy. Gene therapy is also being explored as a potential treatment through inserting missing genes into hematopoietic stem cells, though past trials increased leukemia risk and more research is still needed.
The mechani smof t ransl at i on i ni t i at i on on t he genomi c RNA of Cadi ci vi rus A: a nat ural l y occurri ng di ci st roni c pi cornavi rus and t ype member of t he novel genus Di ci pi vi rus. The document discusses the discovery of Canine dicistronic picornavirus (Cadicivirus A, CDV-A) and aims to characterize the mechanism of translation initiation on its genomic RNA through predicting the secondary structure of its 5'UTR using SHAPE analysis and studying its activity in rabbit reticulocyte lysate using various constructs. Toe-printing
1) The study characterized the internal ribosomal entry site (IRES) of Canine dicistronic picornavirus (Cadicivirus A), a naturally occurring dicistronic picornavirus.
2) Predictive modeling and SHAPE analysis were used to predict the secondary structure of the 5'UTR IRES and confirm its predicted folding.
3) Comparisons showed similarities between domains of the Cadicivirus IRES and domains of the poliovirus IRES, but also differences that may influence structure and function.
4) IRESs can be studied in vitro using rabbit reticulocyte lysate to determine their ability to independently initiate translation of a downstream cistron.
This study investigates the mechanisms underlying the serotype-specific differences in interferon induction between reovirus serotypes 1 (T1) and 3 (T3). T3 potently induces interferon responses through phosphorylation of interferon regulatory factor 3 (IRF3), whereas T1 is a poor inducer. The researchers generated single gene reassortant viruses between strains rsT1L and rsT3D to identify which viral genes are responsible for the differential IRF3 phosphorylation. Preliminary results indicate that IRF3 phosphorylation correlates with the L3, S1, and S3 gene segments from the rsT3D strain.
"Gene Therapy" is a technique used to treat a disease or disorder by inducing the therapeutic gene into the vector, and the vector into the affected organism. So that, the therapeutic proteins expressed will vanish the affected proteins.
This document describes the development of reporter Dengue virus (DENV) strains that express green fluorescent protein (GFP) or firefly luciferase (Fluc). The reporter DENV strains were characterized in vitro and in vivo. In vitro, the reporter DENV strains were infectious, sensitive to antiviral compounds and interferons, and allowed screening of a library of interferon-stimulated genes. In vivo bioluminescence imaging in mice revealed that DENV localized predominantly to lymphoid and gut tissues. A mutation (NS4B L52F) was required to confer virulence of the reporter DENV strain in mice. The reporter DENV strains provide a platform for applications such as antiviral discovery and vaccine validation.
This document provides information on adenosine deaminase (ADA) deficiency and gene therapy as a treatment. ADA is an enzyme involved in purine metabolism and immune system development. ADA deficiency causes severe combined immunodeficiency (SCID) due to immune defects and other issues. Current treatments include bone marrow transplantation, enzyme replacement therapy with PEG-ADA, and gene therapy. Gene therapy for ADA-SCID aims to transfer the ADA gene to hematopoietic stem cells or T lymphocytes using retroviral vectors to restore ADA expression and immune function. Preclinical studies explored these cell-based gene therapy approaches as a potential cure for ADA-SCID.
Human T-Cell Leukemia Virus Type 1 (HTLV-1) is a retrovirus that causes leukemia by interfering with tumor suppressor genes. It was the first human retrovirus discovered. HTLV-1 infects T-cells and causes cancer by changing the action of the TP53 tumor suppressor gene, leading to uncontrolled cell growth. The virus can also cause a severe form of leukemia called Adult T-Cell Leukemia. Additionally, HTLV-1 weakens the immune system by decreasing T-lymphocyte numbers, making the body vulnerable to other diseases.
The document discusses dengue virus (DENV), which is transmitted through mosquitoes and causes dengue fever (DF) and the more severe dengue hemorrhagic fever/dengue shock syndrome (DHF/DSS). It summarizes three major hypotheses for the pathogenesis of DHF/DSS: antibody-dependent enhancement, inappropriate T cell response, and viral virulence. It also discusses potential targets for dengue diagnosis, treatment and vaccines.
Lombardi et al: XMRV/CFS Inflammatory Signaturedegarden
This document summarizes a study that identified a signature of 10 cytokines and chemokines that can correctly identify patients with chronic fatigue syndrome (CFS) associated with xenotropic murine leukemia virus-related virus (XMRV) infection. The study used Luminex multi-analyte profiling to measure cytokine and chemokine levels in the plasma of 118 CFS patients who tested positive for XMRV, compared to 138 healthy controls. Analysis identified a cytokine/chemokine signature that diagnosed XMRV-associated CFS with 93% specificity and 96% sensitivity. This signature provides immunological evidence for the role of XMRV in CFS pathology and the associated inflammatory response.
Natural history of human papillomavirus infections, cytologic and histologic ...Eliana Cordero
This document summarizes the natural history of human papillomavirus (HPV) infections and their relationship to abnormal cervical cytology and histology. It discusses that most HPV infections are transient and asymptomatic, but persistent infection with high-risk HPV types can sometimes lead to precancerous lesions and cervical cancer over many years. HPV type 16 is the most common high-risk type associated with cervical cancer. Screening programs have reduced cervical cancer rates in many countries, but it remains a health issue.
Nucleosome maps of the human Cytomegalovirus genome reveal a temporal switch ...Andres Ramirez
This study investigated the role of the human cytomegalovirus (hCMV) IE protein in nucleosome organization and chromatin structure and function during viral infection. The results showed that hCMV infection causes massive changes to nucleosome organization across the viral genome. Specifically, it was found that (1) IE1 protein expression leads to temporal changes in nucleosome organization dependent on IE1, (2) IE1 expression affects nucleosome occupancy across the hCMV genome, and (3) there is a negative correlation between IE1-dependent changes in nucleosome organization and gene expression. The study provides new insights into how hCMV manipulates chromatin structure to facilitate viral replication.
Gene therapy aims to correct genetic defects by transferring a functional copy of the gene into cells. Various viral and non-viral vectors can be used to deliver therapeutic genes, with viruses being very efficient at gene transfer due to their ability to integrate into the host cell genome. Common viral vectors include adenovirus, retrovirus, lentivirus, adeno-associated virus, and herpes simplex virus. The choice of vector depends on factors like titers achievable, ability to infect dividing and non-dividing cells, immunogenicity, and tissue tropism.
This document summarizes retroviruses and HIV. It discusses the discovery and classification of retroviruses. The structure of retroviruses includes a spherical capsid containing two copies of RNA and viral enzymes. The retrovirus lifecycle includes early reverse transcription of RNA to DNA and later integration into the host genome and assembly of new virions. HIV causes AIDS and was isolated in 1983. It is a global pandemic transmitted sexually or through blood. Treatment includes antiretroviral drugs that target reverse transcriptase, protease, entry, and integration. Prevention focuses on safe sex practices, mother-to-child transmission prevention, and pre-exposure prophylaxis.
A presentation on dengue virus structure, how the virus attacks and spreads in the body, role of heterocyclic drugs in inhibiting the virus and our experiments on the subject.
This document reviews oncogenic, or cancer-causing, viruses. It aims to highlight the distribution and epidemiology of viruses associated with cancer. Several viruses are known to or suspected of causing cancer in humans, including human papillomavirus, Epstein-Barr virus, hepatitis B and C viruses, human herpesvirus 8, human immunodeficiency virus, and human T-lymphotropic virus 1. Oncogenic viruses are divided into DNA and RNA viruses. They cause cancer through various mechanisms during viral replication, including activating oncogenes and causing mutations. The prevalence of viral infections worldwide that are associated with cancer varies by virus and region. Certain virus-induced cancers also have high rates globally, such
This document covers molecular genetics and genetic engineering, including DNA structure and replication, protein synthesis through transcription and translation, the genetic code, the human genome and its uses for diagnosis, therapy and research. It also discusses genetic engineering techniques like PCR and their uses in research, forensics and testing, as well as risks and applications in biotechnology for agriculture like GMOs and in biomedicine like gene therapy and production of human substances.
The document discusses severe combined immunodeficiency (SCID) caused by adenosine deaminase (ADA) deficiency. It notes that ADA deficiency accounts for 20% of SCID cases and is the most severe form, affecting both cell-mediated and humoral immunity. Without treatment, ADA-deficient individuals die from infections within the first year of life. The most successful treatments are bone marrow transplantation or enzyme replacement therapy with polyethylene glycol-modified bovine ADA.
This document provides a summary of Cecilia Frecha's education and professional experience. It lists her PhD in European PhD from the University of Granada in Spain, as well as a Diploma of Advanced Studies from Instituto de Parasitologia y Biomedicina in Granada. Frecha has held several research positions including as a Scientific Researcher at CONICET in Argentina and has received fellowships from the International Agency for Research on Cancer and Ecole Normale Superieure de Lyon. She has over 15 publications in scientific journals and a book chapter focusing on in vivo gene delivery.
This document discusses research on the mechanism of translation initiation on the genomic RNA of Cadicivirus A, a naturally occurring dicistronic picornavirus. Cadicivirus A has a dicistronic genome containing two open reading frames separated by an intergenic region that functions as an internal ribosomal entry site (IRES). The researchers investigated the structure of the 5'UTR IRES using SHAPE analysis, finding it closely resembled the structure of the poliovirus IRES. They showed the 5'UTR IRES could drive translation in rabbit reticulocyte lysate and required the canonical initiation factor eIF4A. Toeprinting analysis was used to study 48S complex formation on the IRES
This document discusses the history and science of organ transplantation. It begins with a brief history, highlighting Nobel Prize-winning discoveries such as the first successful organ transplant between twins in 1954. It then covers key topics like the major histocompatibility complex and mechanisms of graft rejection, such as acute cellular rejection mediated by T cells. The types of transplantation are defined, from autologous to xenogeneic grafts. Prevention of rejection involves tissue typing, immunosuppression, and vaccination. Complications like graft-versus-host disease are also summarized.
In the past 10 years, there has been tremendous progress made in the field of gene therapy. Effective
treatments of Leber congenital amaurosis, hemophilia, and spinal muscular atrophy have been largely based on
the efficiency and safety of adeno-associated vectors. Myocardial gene therapy has been tested in patients with
heart failure using adeno-associated vectors with no safety concerns but lacking clinical improvements. Cardiac
gene therapy is adapting to the new developments in vectors, delivery systems, targets, and clinical end points and
is poised for success in the near future
Severe combined immunodeficiency (SCID) is a genetic disorder characterized by the absence of functional T lymphocytes and B lymphocytes, resulting in impaired adaptive immune system. There are several known types of SCID caused by mutations in different genes. The most common treatment is bone marrow transplantation, with success seen in transplants done in early infancy. Gene therapy is also being explored as a potential treatment through inserting missing genes into hematopoietic stem cells, though past trials increased leukemia risk and more research is still needed.
The mechani smof t ransl at i on i ni t i at i on on t he genomi c RNA of Cadi ci vi rus A: a nat ural l y occurri ng di ci st roni c pi cornavi rus and t ype member of t he novel genus Di ci pi vi rus. The document discusses the discovery of Canine dicistronic picornavirus (Cadicivirus A, CDV-A) and aims to characterize the mechanism of translation initiation on its genomic RNA through predicting the secondary structure of its 5'UTR using SHAPE analysis and studying its activity in rabbit reticulocyte lysate using various constructs. Toe-printing
1) The study characterized the internal ribosomal entry site (IRES) of Canine dicistronic picornavirus (Cadicivirus A), a naturally occurring dicistronic picornavirus.
2) Predictive modeling and SHAPE analysis were used to predict the secondary structure of the 5'UTR IRES and confirm its predicted folding.
3) Comparisons showed similarities between domains of the Cadicivirus IRES and domains of the poliovirus IRES, but also differences that may influence structure and function.
4) IRESs can be studied in vitro using rabbit reticulocyte lysate to determine their ability to independently initiate translation of a downstream cistron.
This study investigates the mechanisms underlying the serotype-specific differences in interferon induction between reovirus serotypes 1 (T1) and 3 (T3). T3 potently induces interferon responses through phosphorylation of interferon regulatory factor 3 (IRF3), whereas T1 is a poor inducer. The researchers generated single gene reassortant viruses between strains rsT1L and rsT3D to identify which viral genes are responsible for the differential IRF3 phosphorylation. Preliminary results indicate that IRF3 phosphorylation correlates with the L3, S1, and S3 gene segments from the rsT3D strain.
"Gene Therapy" is a technique used to treat a disease or disorder by inducing the therapeutic gene into the vector, and the vector into the affected organism. So that, the therapeutic proteins expressed will vanish the affected proteins.
This document describes the development of reporter Dengue virus (DENV) strains that express green fluorescent protein (GFP) or firefly luciferase (Fluc). The reporter DENV strains were characterized in vitro and in vivo. In vitro, the reporter DENV strains were infectious, sensitive to antiviral compounds and interferons, and allowed screening of a library of interferon-stimulated genes. In vivo bioluminescence imaging in mice revealed that DENV localized predominantly to lymphoid and gut tissues. A mutation (NS4B L52F) was required to confer virulence of the reporter DENV strain in mice. The reporter DENV strains provide a platform for applications such as antiviral discovery and vaccine validation.
This document provides information on adenosine deaminase (ADA) deficiency and gene therapy as a treatment. ADA is an enzyme involved in purine metabolism and immune system development. ADA deficiency causes severe combined immunodeficiency (SCID) due to immune defects and other issues. Current treatments include bone marrow transplantation, enzyme replacement therapy with PEG-ADA, and gene therapy. Gene therapy for ADA-SCID aims to transfer the ADA gene to hematopoietic stem cells or T lymphocytes using retroviral vectors to restore ADA expression and immune function. Preclinical studies explored these cell-based gene therapy approaches as a potential cure for ADA-SCID.
Human T-Cell Leukemia Virus Type 1 (HTLV-1) is a retrovirus that causes leukemia by interfering with tumor suppressor genes. It was the first human retrovirus discovered. HTLV-1 infects T-cells and causes cancer by changing the action of the TP53 tumor suppressor gene, leading to uncontrolled cell growth. The virus can also cause a severe form of leukemia called Adult T-Cell Leukemia. Additionally, HTLV-1 weakens the immune system by decreasing T-lymphocyte numbers, making the body vulnerable to other diseases.
The document discusses dengue virus (DENV), which is transmitted through mosquitoes and causes dengue fever (DF) and the more severe dengue hemorrhagic fever/dengue shock syndrome (DHF/DSS). It summarizes three major hypotheses for the pathogenesis of DHF/DSS: antibody-dependent enhancement, inappropriate T cell response, and viral virulence. It also discusses potential targets for dengue diagnosis, treatment and vaccines.
Lombardi et al: XMRV/CFS Inflammatory Signaturedegarden
This document summarizes a study that identified a signature of 10 cytokines and chemokines that can correctly identify patients with chronic fatigue syndrome (CFS) associated with xenotropic murine leukemia virus-related virus (XMRV) infection. The study used Luminex multi-analyte profiling to measure cytokine and chemokine levels in the plasma of 118 CFS patients who tested positive for XMRV, compared to 138 healthy controls. Analysis identified a cytokine/chemokine signature that diagnosed XMRV-associated CFS with 93% specificity and 96% sensitivity. This signature provides immunological evidence for the role of XMRV in CFS pathology and the associated inflammatory response.
Natural history of human papillomavirus infections, cytologic and histologic ...Eliana Cordero
This document summarizes the natural history of human papillomavirus (HPV) infections and their relationship to abnormal cervical cytology and histology. It discusses that most HPV infections are transient and asymptomatic, but persistent infection with high-risk HPV types can sometimes lead to precancerous lesions and cervical cancer over many years. HPV type 16 is the most common high-risk type associated with cervical cancer. Screening programs have reduced cervical cancer rates in many countries, but it remains a health issue.
Human Endogenous Retroviruses As Etiologic Factors In Lupus.pptxTysonDawson
This study analyzed RNA sequencing data from two datasets of lupus patients and healthy controls to identify differentially expressed human endogenous retroviruses (HERVs) in lupus. The researchers identified 471 HERVs differentially expressed between lupus patients and controls, including 69 HERVs differentially expressed in both datasets. Gene expression analysis revealed upregulation of interferon-stimulated genes in lupus patients. Biological pathways analysis showed dysregulation of immune pathways. The results suggest HERVs may drive immune pathways by regulating nearby genes or simulating cytoplasmic virus sensing mechanisms, and warrant further investigation into HERV-gene networks and incorporating HERV data into machine learning models for lupus subtyping and classification.
1) The document discusses two positions on HIV that are not fully compatible with scientific evidence: that HIV exists but is harmless, and that HIV does not exist.
2) It suggests that human endogenous retroviruses (HERVs) heavily interfere with AIDS research findings and may offer an alternative explanation for published data.
3) It argues that if a virus was responsible for AIDS, retroviral particles should be visible in electron micrographs of patient samples, but that no one has succeeded in visualizing retroviral particles in blood from AIDS patients.
potassium, chloride, bicarbonate, blood urea nitrogen (BUN), magnesium, creatinine, glucose, and sometimes calcium. Tests that focus on cholesterol levels can determine LDL and HDL cholesterol levels, as well as triglyceride levels.[6]
IFN- b and multiple sclerosis: From etiology to therapy and backMutiple Sclerosis
1) The document discusses the hypothesis that viral infections, such as Epstein-Barr virus (EBV) and human endogenous retroviruses (HERVs), may play a role in the etiology of multiple sclerosis (MS).
2) Interferon-beta (IFN-β) was the first disease-modifying therapy approved for relapsing-remitting MS based on its ability to reduce clinical relapses and magnetic resonance imaging (MRI) lesions in clinical trials.
3) IFN-β formulations target the proposed viral triggers of MS through the drug's antiviral properties, providing a potential link between the etiology and treatment of the disease.
HHV-6 is a common human herpesvirus that infects 90% of the population in childhood. It can remain dormant and reactivate, attacking immune cells. HHV-6 has been linked to chronic fatigue syndrome, fibromyalgia, chronic Lyme disease, and some cancers. It may contribute to neurological conditions like Alzheimer's and Parkinson's. Treatment involves modulating the immune system and targeting co-infections like HHV-6.
The document discusses human papillomavirus (HPV) and its role in cervical cancer. It provides a history of HPV research and establishes a causal link between high-risk HPV types and cervical cancer through large epidemiological studies. The document also examines HPV genome structure and how the E6 and E7 oncoproteins interact with host cell proteins to promote oncogenesis and immortalization, ultimately leading to cervical cancer if a persistent infection occurs.
fact sheet human herpes virus mod 7 updated.docxSoniaShandil
Human herpesvirus 4, also known as Epstein-Barr virus (EBV), is one of the most common human viruses that infects B cells and epithelial cells. It was first discovered in 1964 in cultured tumor cells from a patient with Burkitt's lymphoma in Uganda. EBV has a double-stranded DNA genome enclosed in proteins and enters host cells via glycoproteins in its envelope. The virus can cause either a lytic infection, actively replicating and producing new virus particles, or establish a latent infection that can last a lifetime with only limited gene expression. There is no vaccine to protect against EBV infection, so prevention focuses on avoiding contact with saliva and practicing good hand hygiene.
This document discusses viruses that can cause cancer in humans. It describes how certain DNA viruses, like HPV and HBV, integrate into the host cell's genome and influence cell cycle progression by encoding proteins that alter normal cell cycle control genes. This leads to cellular transformation and the potential for tumor development. It provides details on specific human cancer-causing viruses, their viral oncoproteins that subvert the cell cycle, and the cellular targets and cancers they are associated with, such as HPV's role in cervical cancer through the actions of the E6 and E7 proteins.
Chronic Lyme disease is really complex multi-system, multi-neuroendocrine, multi-infectious disease that mimics over 350 different inflammatory diseases.
Herpes viruses have been implicated in the pathogenesis of periodontal disease. Several studies have found associations between herpes simplex virus (HSV), Epstein-Barr virus (EBV), human cytomegalovirus (HCMV), and human herpesvirus types 6, 7, and 8 with periodontitis. These viruses have been detected in gingival crevicular fluid and gingival tissue samples from patients with periodontitis at higher rates than in healthy patients. The presence of herpes viruses appears to be correlated with increased severity of periodontal inflammation and attachment loss. Co-infection with multiple herpes viruses and periodontal pathogens may also influence disease progression.
Kaposi's sarcoma is a type of cancer that forms in blood and lymph vessels. It is caused by infection with the human herpesvirus 8 (HHV-8). Kaposi's sarcoma lesions often appear as purplish spots on the legs, feet, and mouth. HHV-8 is the cause of Kaposi's sarcoma in HIV-positive patients due to their immunosuppression. Staphylococcus aureus is a bacterium that commonly infects the skin and can spread between people or on objects. It is associated with periodontitis in HIV-positive patients. The study aimed to understand how S. aureus and its components affect Kaposi's sarcoma-associated herpesvirus re
The document summarizes two scientific studies. The first study from Lund University found that retroviruses establish themselves in our genome and allow for expression of retroviral genes by acting as docking platforms for proteins. This may be connected to neurological diseases. The second study from Van Andel Research Institute described the mechanism of how the helicase enzyme works during DNA replication. Understanding retroviruses and helicase could lead to new therapies for diseases linked to issues with replication and retroviral expression.
- The document discusses a case study of a female patient who developed generalized seizures postpartum due to Herpes simplex virus type 1 (HSV-1) encephalitis without typical symptoms of fever or headache.
- Clinicians used various clinical tests and methods to identify the cause, determining it was HSV-1 encephalitis through MRI, EEG, and cerebral spinal fluid tests.
- The paper examines how HSV-1 infections can occur in the postpartum period due to physiological immunosuppression during pregnancy, increasing risk without common symptoms.
This document summarizes several diagnostic techniques used in virology laboratories, including direct staining for viral antigens, enzyme immunoassays, molecular amplification methods, and viral cell culture. It describes specific techniques for detecting viruses such as herpes simplex, varicella zoster, cytomegalovirus, adenovirus, parvovirus, papillomavirus, and polyomavirus. Key diagnostic methods are highlighted for each virus family, along with brief descriptions of associated diseases.
The document discusses shingles, which is caused by the varicella zoster virus (VZV) that also causes chickenpox. After a chickenpox infection, the VZV virus remains dormant in the body's nerves. Approximately 30% of people who had chickenpox will later develop shingles. The VZV replicates within cells and can be classified as a varicellovirus within the Herpesviridae family. While related to herpes simplex viruses 1 and 2, VZV is thought to have diverged from a common ancestral virus. Genomic sequencing has identified nine genotypes of VZV that are globally distributed.
HHV-6 is a common human herpes virus that infects 90% of children. It can remain dormant and reactivate, potentially causing chronic fatigue syndrome, fibromyalgia, and neurological issues. HHV-6 attacks immune cells and can activate other viruses. It is commonly found in patients with chronic Lyme disease. By damaging the tumor suppressor protein p53, HHV-6 may also contribute to cancers. Advanced testing is needed to determine HHV-6's role in chronic diseases and the best therapies to modulate the immune system.
Similar to Human Endogenous Retrovirus (paper) (20)
Kevin Hugins research paper.
Meriam-Webster defines endocrinology as “a branch of medicine concerned with the structure, function, and disorders of the endocrine glands.” When considering the human endocrine system, most people think of endocrine glands such as the hypothalamus, pituitary, gonads, adrenals, and pancreas. No one would deny that hormones released from endocrine glands have a powerful effect on cell function throughout the human body. A relatively new field of study called Microbial Endocrinology suggests that the interactions and effects of the human endocrine system involve more organisms than just the human.
Power Point for research paper presentation by Kevin Hugins.
Through microbial endocrinology other treatments may be developed. As this paper has discussed, application of these techniques may one day provide a treatment for pathogens other than the traditional antibiotics. It may lead to techniques for dealing with auto-immune diseases. Considering the sheer numbers of microorganisms in our microbiota and all we have yet to learn on the molecular level, this field of research may answer questions we do not even know we have yet.
PSA Poster: Antibiotic Resistant GonorrheaKevin B Hugins
This project was done in BIOL 453, Immunology. The CDC has classified antibiotic resistant gonorrhea as an "urgent threat" in its 2013 antibiotic resistance threat report. Education for at risk groups is essential to slow the threat of this disease.
Evolution in the news (BIOL415) Spring 2014Kevin B Hugins
Mini presentation on current news stories for BIOL 415
This news article was about a journal article published in Nature Communications on April 15, 2014. The article is the result of research that was led by scientists from the Max Planck Institute for Evolutionary Anthropology. The purpose of the research was to study the co-evolution of humans and gut microbiota and examine adaptation that resulted in groups that had different diets. The primary group of interest was a hunter-gatherer group located in Tanzania known as Hadza. This is one of the few remaining true foraging populations in the world. The Hadza diet consists of baobab, game meat, honey, berries and tubers. Hadza do not consume any agricultural crops or livestock.
Evolution in the news: Power point presentation (BIOL415) Spring 2014Kevin B Hugins
Mini presentation on current news stories for BIOL 415
This news article was about a journal article published in Nature Communications on April 15, 2014. The article is the result of research that was led by scientists from the Max Planck Institute for Evolutionary Anthropology. The purpose of the research was to study the co-evolution of humans and gut microbiota and examine adaptation that resulted in groups that had different diets. The primary group of interest was a hunter-gatherer group located in Tanzania known as Hadza. This is one of the few remaining true foraging populations in the world. The Hadza diet consists of baobab, game meat, honey, berries and tubers. Hadza do not consume any agricultural crops or livestock.
Cathinone (power-point to accompany report) Kevin B Hugins
Cathinone is a naturally occurring monoamine alkaloid found in the leaves of the Catha edulis tree. The ingestion of cathinone causes stimulation and euphoria. Use of Catha edulis, or “khat” by man can be traced back to ancient Egypt. Current use of khat is primarily in Africa and the Middle East. Cathinone exerts its effects by mimicking monoamine neurotransmitters. An entire class of substituted cathinones has been synthesized. The effect and reasons for use of these can be medicinal, recreational, or detrimental. This paper will address the biology of Catha edulis, its history and use by humans, and the biological activity cathinone exerts upon them. Next it will explain the biosynthesis of cathinone within Catha edulis followed by the chemical synthesis of cathinone and substituted cathinones in the lab. Finally it will discuss some of the chemical applications and consequences of the use of substituted cathinones in recent years.
Cathinone history, synthesis, and human applicationsKevin B Hugins
Cathinone is a naturally occurring monoamine alkaloid found in the leaves of the Catha edulis tree. The ingestion of cathinone causes stimulation and euphoria. Use of Catha edulis, or “khat” by man can be traced back to ancient Egypt. Current use of khat is primarily in Africa and the Middle East. Cathinone exerts its effects by mimicking monoamine neurotransmitters. An entire class of substituted cathinones has been synthesized. The effect and reasons for use of these can be medicinal, recreational, or detrimental. This paper will address the biology of Catha edulis, its history and use by humans, and the biological activity cathinone exerts upon them. Next it will explain the biosynthesis of cathinone within Catha edulis followed by the chemical synthesis of cathinone and substituted cathinones in the lab. Finally it will discuss some of the chemical applications and consequences of the use of substituted cathinones in recent years.
Bacterial antibiotic resistance is a topic that is causing increasing concern in the health community. Antibiotics are a necessary drug to help protect and heal us from pathogenic infections that our immune system is unable to successfully combat on its own. However, bacteria are very adept at utilizing evolutionary processes to develop antibiotic resistance in order to promote their own survival, reproduction and persistence. The development of antibiotic resistant bacteria is occurring at an alarming rate. Researchers are investigating the mechanisms that confer resistance on bacteria. With techniques for genomic sequencing now readily available, understanding of genetic mechanisms of resistance and evolution as a whole has been advancing rapidly. Researchers have found that bacteria are very adept at gene mutation and horizontal gene transfer. New insights regarding pleiotrophy and epistasis have been provided through these techniques. A possible result of this research will be the discovery of new antibiotic therapies. However, as the research is demonstrating, even if we develop new antibiotics, bacteria will develop resistance to them. Thus, important considerations to be taken from the research include finding ways to slow the development of resistance as we will most likely never be able to stop it entirely.
Chimeric Antigen Receptors (paper with corresponding power point)Kevin B Hugins
Gene therapy was first conceptualized to alter debilitating fates of genetic diseases. Gene therapy technology can help introduce new functional DNA to replace mutated genes. The idea first arose in 1972 when Friedmann and Roblin authored a paper, “Gene therapy for human genetic disease?”, demonstrating that exogenous DNA can be taken up by mammalian cells (1). They proposed that the same procedure could be done on humans to correct genetic defects by introducing therapeutic DNA. Currently, genetic modification of T lymphocytes has been the major area of research for treating malignant tumors. This technique seeks to create chimeric antigen receptor (CAR) in T cells by genetically modifying them in vitro and reintroduce them back into blood circulation. The T cells are unique to every patient and the chimeric antigen receptors are unique to the tumor that it is targeting.
The document discusses the development of chimeric antigen receptor (CAR) gene therapy for cancer treatment. It describes how early T-cell receptor modification efforts were unsuccessful due to immune rejection, leading to the creation of entirely new CAR receptors. CAR therapy generates antibodies to target antigens on cancer cells. The CAR is constructed through multiple steps and generations have improved effects. CAR therapy activates T-cells to attack cancer cells and has shown promising results in clinical trials.
ESA/ACT Science Coffee: Diego Blas - Gravitational wave detection with orbita...Advanced-Concepts-Team
Presentation in the Science Coffee of the Advanced Concepts Team of the European Space Agency on the 07.06.2024.
Speaker: Diego Blas (IFAE/ICREA)
Title: Gravitational wave detection with orbital motion of Moon and artificial
Abstract:
In this talk I will describe some recent ideas to find gravitational waves from supermassive black holes or of primordial origin by studying their secular effect on the orbital motion of the Moon or satellites that are laser ranged.
Mending Clothing to Support Sustainable Fashion_CIMaR 2024.pdfSelcen Ozturkcan
Ozturkcan, S., Berndt, A., & Angelakis, A. (2024). Mending clothing to support sustainable fashion. Presented at the 31st Annual Conference by the Consortium for International Marketing Research (CIMaR), 10-13 Jun 2024, University of Gävle, Sweden.
CLASS 12th CHEMISTRY SOLID STATE ppt (Animated)eitps1506
Description:
Dive into the fascinating realm of solid-state physics with our meticulously crafted online PowerPoint presentation. This immersive educational resource offers a comprehensive exploration of the fundamental concepts, theories, and applications within the realm of solid-state physics.
From crystalline structures to semiconductor devices, this presentation delves into the intricate principles governing the behavior of solids, providing clear explanations and illustrative examples to enhance understanding. Whether you're a student delving into the subject for the first time or a seasoned researcher seeking to deepen your knowledge, our presentation offers valuable insights and in-depth analyses to cater to various levels of expertise.
Key topics covered include:
Crystal Structures: Unravel the mysteries of crystalline arrangements and their significance in determining material properties.
Band Theory: Explore the electronic band structure of solids and understand how it influences their conductive properties.
Semiconductor Physics: Delve into the behavior of semiconductors, including doping, carrier transport, and device applications.
Magnetic Properties: Investigate the magnetic behavior of solids, including ferromagnetism, antiferromagnetism, and ferrimagnetism.
Optical Properties: Examine the interaction of light with solids, including absorption, reflection, and transmission phenomena.
With visually engaging slides, informative content, and interactive elements, our online PowerPoint presentation serves as a valuable resource for students, educators, and enthusiasts alike, facilitating a deeper understanding of the captivating world of solid-state physics. Explore the intricacies of solid-state materials and unlock the secrets behind their remarkable properties with our comprehensive presentation.
Immersive Learning That Works: Research Grounding and Paths ForwardLeonel Morgado
We will metaverse into the essence of immersive learning, into its three dimensions and conceptual models. This approach encompasses elements from teaching methodologies to social involvement, through organizational concerns and technologies. Challenging the perception of learning as knowledge transfer, we introduce a 'Uses, Practices & Strategies' model operationalized by the 'Immersive Learning Brain' and ‘Immersion Cube’ frameworks. This approach offers a comprehensive guide through the intricacies of immersive educational experiences and spotlighting research frontiers, along the immersion dimensions of system, narrative, and agency. Our discourse extends to stakeholders beyond the academic sphere, addressing the interests of technologists, instructional designers, and policymakers. We span various contexts, from formal education to organizational transformation to the new horizon of an AI-pervasive society. This keynote aims to unite the iLRN community in a collaborative journey towards a future where immersive learning research and practice coalesce, paving the way for innovative educational research and practice landscapes.
Microbial interaction
Microorganisms interacts with each other and can be physically associated with another organisms in a variety of ways.
One organism can be located on the surface of another organism as an ectobiont or located within another organism as endobiont.
Microbial interaction may be positive such as mutualism, proto-cooperation, commensalism or may be negative such as parasitism, predation or competition
Types of microbial interaction
Positive interaction: mutualism, proto-cooperation, commensalism
Negative interaction: Ammensalism (antagonism), parasitism, predation, competition
I. Mutualism:
It is defined as the relationship in which each organism in interaction gets benefits from association. It is an obligatory relationship in which mutualist and host are metabolically dependent on each other.
Mutualistic relationship is very specific where one member of association cannot be replaced by another species.
Mutualism require close physical contact between interacting organisms.
Relationship of mutualism allows organisms to exist in habitat that could not occupied by either species alone.
Mutualistic relationship between organisms allows them to act as a single organism.
Examples of mutualism:
i. Lichens:
Lichens are excellent example of mutualism.
They are the association of specific fungi and certain genus of algae. In lichen, fungal partner is called mycobiont and algal partner is called
II. Syntrophism:
It is an association in which the growth of one organism either depends on or improved by the substrate provided by another organism.
In syntrophism both organism in association gets benefits.
Compound A
Utilized by population 1
Compound B
Utilized by population 2
Compound C
utilized by both Population 1+2
Products
In this theoretical example of syntrophism, population 1 is able to utilize and metabolize compound A, forming compound B but cannot metabolize beyond compound B without co-operation of population 2. Population 2is unable to utilize compound A but it can metabolize compound B forming compound C. Then both population 1 and 2 are able to carry out metabolic reaction which leads to formation of end product that neither population could produce alone.
Examples of syntrophism:
i. Methanogenic ecosystem in sludge digester
Methane produced by methanogenic bacteria depends upon interspecies hydrogen transfer by other fermentative bacteria.
Anaerobic fermentative bacteria generate CO2 and H2 utilizing carbohydrates which is then utilized by methanogenic bacteria (Methanobacter) to produce methane.
ii. Lactobacillus arobinosus and Enterococcus faecalis:
In the minimal media, Lactobacillus arobinosus and Enterococcus faecalis are able to grow together but not alone.
The synergistic relationship between E. faecalis and L. arobinosus occurs in which E. faecalis require folic acid
JAMES WEBB STUDY THE MASSIVE BLACK HOLE SEEDSSérgio Sacani
The pathway(s) to seeding the massive black holes (MBHs) that exist at the heart of galaxies in the present and distant Universe remains an unsolved problem. Here we categorise, describe and quantitatively discuss the formation pathways of both light and heavy seeds. We emphasise that the most recent computational models suggest that rather than a bimodal-like mass spectrum between light and heavy seeds with light at one end and heavy at the other that instead a continuum exists. Light seeds being more ubiquitous and the heavier seeds becoming less and less abundant due the rarer environmental conditions required for their formation. We therefore examine the different mechanisms that give rise to different seed mass spectrums. We show how and why the mechanisms that produce the heaviest seeds are also among the rarest events in the Universe and are hence extremely unlikely to be the seeds for the vast majority of the MBH population. We quantify, within the limits of the current large uncertainties in the seeding processes, the expected number densities of the seed mass spectrum. We argue that light seeds must be at least 103 to 105 times more numerous than heavy seeds to explain the MBH population as a whole. Based on our current understanding of the seed population this makes heavy seeds (Mseed > 103 M⊙) a significantly more likely pathway given that heavy seeds have an abundance pattern than is close to and likely in excess of 10−4 compared to light seeds. Finally, we examine the current state-of-the-art in numerical calculations and recent observations and plot a path forward for near-future advances in both domains.
Anti-Universe And Emergent Gravity and the Dark UniverseSérgio Sacani
Recent theoretical progress indicates that spacetime and gravity emerge together from the entanglement structure of an underlying microscopic theory. These ideas are best understood in Anti-de Sitter space, where they rely on the area law for entanglement entropy. The extension to de Sitter space requires taking into account the entropy and temperature associated with the cosmological horizon. Using insights from string theory, black hole physics and quantum information theory we argue that the positive dark energy leads to a thermal volume law contribution to the entropy that overtakes the area law precisely at the cosmological horizon. Due to the competition between area and volume law entanglement the microscopic de Sitter states do not thermalise at sub-Hubble scales: they exhibit memory effects in the form of an entropy displacement caused by matter. The emergent laws of gravity contain an additional ‘dark’ gravitational force describing the ‘elastic’ response due to the entropy displacement. We derive an estimate of the strength of this extra force in terms of the baryonic mass, Newton’s constant and the Hubble acceleration scale a0 = cH0, and provide evidence for the fact that this additional ‘dark gravity force’ explains the observed phenomena in galaxies and clusters currently attributed to dark matter.
The debris of the ‘last major merger’ is dynamically youngSérgio Sacani
The Milky Way’s (MW) inner stellar halo contains an [Fe/H]-rich component with highly eccentric orbits, often referred to as the
‘last major merger.’ Hypotheses for the origin of this component include Gaia-Sausage/Enceladus (GSE), where the progenitor
collided with the MW proto-disc 8–11 Gyr ago, and the Virgo Radial Merger (VRM), where the progenitor collided with the
MW disc within the last 3 Gyr. These two scenarios make different predictions about observable structure in local phase space,
because the morphology of debris depends on how long it has had to phase mix. The recently identified phase-space folds in Gaia
DR3 have positive caustic velocities, making them fundamentally different than the phase-mixed chevrons found in simulations
at late times. Roughly 20 per cent of the stars in the prograde local stellar halo are associated with the observed caustics. Based
on a simple phase-mixing model, the observed number of caustics are consistent with a merger that occurred 1–2 Gyr ago.
We also compare the observed phase-space distribution to FIRE-2 Latte simulations of GSE-like mergers, using a quantitative
measurement of phase mixing (2D causticality). The observed local phase-space distribution best matches the simulated data
1–2 Gyr after collision, and certainly not later than 3 Gyr. This is further evidence that the progenitor of the ‘last major merger’
did not collide with the MW proto-disc at early times, as is thought for the GSE, but instead collided with the MW disc within
the last few Gyr, consistent with the body of work surrounding the VRM.
Evidence of Jet Activity from the Secondary Black Hole in the OJ 287 Binary S...Sérgio Sacani
Wereport the study of a huge optical intraday flare on 2021 November 12 at 2 a.m. UT in the blazar OJ287. In the binary black hole model, it is associated with an impact of the secondary black hole on the accretion disk of the primary. Our multifrequency observing campaign was set up to search for such a signature of the impact based on a prediction made 8 yr earlier. The first I-band results of the flare have already been reported by Kishore et al. (2024). Here we combine these data with our monitoring in the R-band. There is a big change in the R–I spectral index by 1.0 ±0.1 between the normal background and the flare, suggesting a new component of radiation. The polarization variation during the rise of the flare suggests the same. The limits on the source size place it most reasonably in the jet of the secondary BH. We then ask why we have not seen this phenomenon before. We show that OJ287 was never before observed with sufficient sensitivity on the night when the flare should have happened according to the binary model. We also study the probability that this flare is just an oversized example of intraday variability using the Krakow data set of intense monitoring between 2015 and 2023. We find that the occurrence of a flare of this size and rapidity is unlikely. In machine-readable Tables 1 and 2, we give the full orbit-linked historical light curve of OJ287 as well as the dense monitoring sample of Krakow.
PPT on Direct Seeded Rice presented at the three-day 'Training and Validation Workshop on Modules of Climate Smart Agriculture (CSA) Technologies in South Asia' workshop on April 22, 2024.
Travis Hills of MN is Making Clean Water Accessible to All Through High Flux ...Travis Hills MN
By harnessing the power of High Flux Vacuum Membrane Distillation, Travis Hills from MN envisions a future where clean and safe drinking water is accessible to all, regardless of geographical location or economic status.
EWOCS-I: The catalog of X-ray sources in Westerlund 1 from the Extended Weste...Sérgio Sacani
Context. With a mass exceeding several 104 M⊙ and a rich and dense population of massive stars, supermassive young star clusters
represent the most massive star-forming environment that is dominated by the feedback from massive stars and gravitational interactions
among stars.
Aims. In this paper we present the Extended Westerlund 1 and 2 Open Clusters Survey (EWOCS) project, which aims to investigate
the influence of the starburst environment on the formation of stars and planets, and on the evolution of both low and high mass stars.
The primary targets of this project are Westerlund 1 and 2, the closest supermassive star clusters to the Sun.
Methods. The project is based primarily on recent observations conducted with the Chandra and JWST observatories. Specifically,
the Chandra survey of Westerlund 1 consists of 36 new ACIS-I observations, nearly co-pointed, for a total exposure time of 1 Msec.
Additionally, we included 8 archival Chandra/ACIS-S observations. This paper presents the resulting catalog of X-ray sources within
and around Westerlund 1. Sources were detected by combining various existing methods, and photon extraction and source validation
were carried out using the ACIS-Extract software.
Results. The EWOCS X-ray catalog comprises 5963 validated sources out of the 9420 initially provided to ACIS-Extract, reaching a
photon flux threshold of approximately 2 × 10−8 photons cm−2
s
−1
. The X-ray sources exhibit a highly concentrated spatial distribution,
with 1075 sources located within the central 1 arcmin. We have successfully detected X-ray emissions from 126 out of the 166 known
massive stars of the cluster, and we have collected over 71 000 photons from the magnetar CXO J164710.20-455217.
2. Viruses have been indirectly implicated in many complex human diseases. These include
cancers such as cutaneous T-cell lymphoma (CTCL), neurological disorders such as
schizophrenia (SZ) and bipolar disorder (BP), and autoimmune diseases such as multiple
sclerosis (MS). Research has shown that viruses including cytomegalovirus (CMV), Epstein-
Barr virus (EBV), and influenza viruses show a positive correlation with many of these diseases.
However, in many instances, researchers were unable to understand the precise relationship these
common viruses had with more complex diseases. For example, even though multiple studies
had suggested that EBV played a role in the onset of MS, researchers had been unable to prove
exactly how the two are connected.
When one thinks of viruses, the image that is generally conjured is infectious microscopic
particles that closely resemble the lunar lander that cause diseases such as herpes, AIDS,
hepatitis, or colds. Very few people would imagine viruses that exist persistently in their very
own chromosomes which they will pass down to future generations. Human Endogenous
Retroviruses (HERVs) are precisely that. Approximately 8% of DNA in the human genome is
viral DNA. These elements of human chromosomes include env, pol, and gag genes like those
found in exogenous retroviruses such as human immunodeficiency virus (HIV) and human T-cell
leukemia virus (HTLV).5
Env codes for retroviral coat proteins, pol for reverse transcriptase,
protease, and integrase, and gag codes for group specific antigens which include the structural
proteins of the virus. The human genome is littered with these viral genes.
It is believed that HERVs are the result of ancient viral infections. Retroviruses found
their way into germ cells of our ancestors and ultimately incorporated their DNA into egg or
sperm cells. The viral DNA was then able to replicate and transpose repeatedly in the human
genome, resulting in multiple copies of the virus’s genes spread throughout our chromosomes.
3. As evolution has progressed, most of these HERVs have mutated to the point that they are
unable to function or replicate properly due to nonsense mutations or major deletions. This has
not rendered HERVs benign however. HERVs that are not fully functional can still have
deleterious effects if they are integrated close to promoters or enhancers of functional genes.2
A number of HERVs have maintained some functionality and still contain intact open
reading frames (ORF’s) which code for fully functional proteins.8
HERV-W is one of these
endogenous retroviruses. Over the last few years several research projects have suggested that
HERV-W may be involved with multiple sclerosis, bipolar disorder, schizophrenia, autism, and
various tumors. The presence of HERV-W RNAs, proteins, and virions has been detected in
association with these diseases.5
Typically, HERV genes that code for functional proteins are
kept methylated and tightly bound up around histones to prevent their transcription and
translation. However, research has shown that these genes can become activated resulting in the
production of viral DNA/RNA and proteins which can be detected in our bodies just like the
DNA/RNA and proteins of “traditional” viruses can be.
HERV-W’s role in MS is the most studied and best understood. In 1987, Herve Perron, a
graduate student at Grenoble University in France, decided to take a new approach in
investigating the causes of MS. At that time, scientists felt that a virus was responsible for the
disease. Researchers had investigated EBV, CMV, HTLV and herpes hoping to identify the
virus that causes brain lesions associated with the MS. All those studies had left researchers
empty handed. Perron extracted cerebral spinal fluid from the spinal columns of multiple
sclerosis patients. Then, rather than try to track down a specific virus, Perron tested the spinal
fluid for the presence of reverse transcriptase in an attempt to work backward to ultimately
identify the cause of the disease. After 10 years of exhaustive research, Perron located and
4. identified the retrovirus responsible for MS. That virus was not one that invaded the patient
from the outside. That virus was HERV-W, a retrovirus that each of us has dozens of copies of
within our own genome.4
Now that Perron had shown that MS was caused by a virus that all of us have inside us,
researchers next had to discover what activated HERV-W. At that time EBV was thought to
play a role in MS. A history of late infectious mononucleosis and high levels of anti-EBV
antibodies are factors that increase the risk of MS onset. However, EBV could be latent in the
patient and anti-EVB levels could fall to levels similar to that of non-MS subjects while the
patient’s MS continued to progress. Mameli et al. have since shown that HERV-W env proteins
and RNA are consistently present in high levels in MS patients and fluctuations in HERV-W
protein and RNA levels have been shown to parallel disease behavior of progressing MS stages
and active or remission phases of the disease.10
During their research, Mameli et al. discovered how HERV-W linked EBV to MS. They
found that HERV-W is activated in blood mononuclear cells of infectious mononucleosis
patients.10
EBV was necessary to activate HERV-W. EBV was a factor in the onset of MS but
was not required to remain active for the condition to progress.
The understanding of HERV-W’s involvement in MS has potentially answered another
question about the development of the disease. MS strikes women at a rate of 2:1 over men. A
complete copy of HERV-W is located on chromosome 7. That copy is generally the one
implicated in HERV-W activation. However, a copy of HERV-W with an almost complete open
reading frame resides on the X chromosome, at Xq22.3. Garcia-Montojo et al. found that there
are 3 polymorphisms of that HERV-W copy. Their research showed that one of those
5. polymorphisms was associated with higher susceptibility and severity of MS in women in their
study.5
This suggests that even an incomplete gene sequence of HERV-W can exert a biological
effect.
Around the same time Perron was investigating MS, Fuller Torrey at The National
Institute of Mental Health in Washington DC, and Robert Yolken at John Hopkins University,
began to investigate possible viral causes for schizophrenia.4
As was the case with MS, Torrey
and Yolken found that most schizophrenics had antibodies against EBV and CMV but did not
have active infections. They began to approach their research the same way Perron did,
searching for reverse transcriptase rather than trying to prove certain viruses were responsible for
the condition. In 2001 they found HERV-W was the culprit.
Huang et al. found that HERV-W retroviral pol genes and DNA/RNA were found in the
plasma and cerebral spinal fluid in just over 1/3 of subjects with recent-onset schizophrenia. No
HERV-W associated genes or proteins were detected in the plasma or CSF of the control
subjects. Their study also suggested that HERV-W increased promoter activation of genes
BDNF, NTRK2 and DRD3. Increased expression of these genes contributes to the onset of
schizophrenia.7
Recent studies by Perron et al. show a correlation between HERV-W and
schizophrenia as well as bipolar disorder. They also found that HERV-W can be activated by T.
gondii and influenza virus.11
Dysfunction of GABA receptors has been implicated in schizophrenia. Hegyi et al.
found that in postmortem studies of the brains of schizophrenics and autistic patients, GABBR1
on chromosome 6 was down regulated. An HERV-W gene is located in the regulatory region of
GABBR1. It is hypothesized that hyper methylation of the HERV-W region in response to halt
6. its expression also affected GABBR1 expression, resulting in down regulation of that gene also.6
Balestrieri et al. also found a correlation between HERV-W and autism spectrum disorders.2
They too suggested that DNA methylation associated with HERV-W genes may contribute to the
development of autism spectrum disorders.
Maliniemi et al. investigated the correlation between mycosis fungoides (MF) and
HERV-W. MF is the most common type of primary cutaneous T-cell lymphoma (CTCL).
Biopsies were taken from the lesions of patients with MF, unaffected regions of skin from those
same patients, and the same locations from unaffected control subjects. The MF biopsies
showed significantly increased HERV-W transcription over the other two types of samples in all
patients. The transcribed HERV-W loci were found in chromosomes 6q21 and 7q21.2, regions
typically altered in CTCL.9
Assinger et al. found that human cytomegalovirus (HCMV) and
HERV-W are present together in many cancers including glioblastoma, neuroblastoma, and
breast and prostate cancer.1
Their research showed a direct correlation between levels of HCMV
and HERV-W in tumors. If HCMV levels went up, HERV-W did as well.
Study after study has shown that HERV-W is implicated in multiple human diseases and
disorders. In each instance, an inflammatory immune response resulting from a viral or bacterial
co-infection has been responsible for activating HERV-W. However, as is the case with most
viruses, HERV-W has some unexpected tricks up its sleeve.
Liu et al. found that caffeine and aspirin could increase the expression of HERV-W env
and gag in human neuroblastoma cells and caffeine could even activate the HERV-W env
promoter.8
Diem et al. found that valproic acid, which is typically prescribed for seizures and
mood disorders, significantly increased HERV-W transcription.3
7. In spite of HERV-W’s role in so many diseases, without it, humans would not exist.
HERV-W env glycoprotein gene codes for syncytin-1. Syncytin-1 is vital in fetal cellular
differentiation creating syncytiotrophoblasts which are responsible for anchoring fetal cells to
maternal cells in the placenta.13
HERV-W env also has an immunosuppressive region. It is
believed that this plays a role in preventing the rejection of fetal cells by the mother’s immune
system.12
When the human genome was first mapped and studied, due to characteristics like long
terminal repeats, genes such as HERV-W were considered junk DNA. As research techniques
have advanced, scientists have progressively found more and more functions, some positive,
some pathogenic, of HERV-W. As research continues to move forward and our understanding
of genetics advances, researchers will most certainly find that other areas of endogenous viral
DNA which play a role in human health and development.
8. Works Cited
1. Assinger, A., Yaiw, K., Göttesdorfer, I., Leib-Mösch, C., & Söderberg-Nauclér, C. (2013). Human
Cytomegalovirus (HCMV) Induces Human Endogenous Retrovirus (HERV) Transcription.
Retrovirology, 10(1), 132. Doi: 10.1186/1742-4690-10-132
2. Balestrieri, E., Arpino, C., Matteucci, C., Sorrentino, R., Pica, F., Alessandrelli, R., ... Sinibaldi-
Vallebona, P. (2012). HERVs Expression in Autism Spectrum Disorders (G. M. Mcalonan,
Ed.). PLoS ONE, 7(11), E48831. Doi: 10.1371/journal.pone.0048831
3. Diem, O., Schäffner, M., Seifarth, W., & Leib-Mösch, C. (2012). Influence of Antipsychotic Drugs on
Human Endogenous Retrovirus (HERV) Transcription in Brain Cells (K. Hashimoto, Ed.).
PLoS ONE, 7(1), E30054. Doi: 10.1371/journal.pone.0030054
4. Fox, D. (2010, June). The Insanity Virus. Discover. Retrieved from
Http://discovermagazine.com/2010/jun/03-the-insanity-virus
5. García-Montojo, M., Hera, B. D., Varadé, J., Encarnación, A. D., Camacho, I., Domínguez-Mozo, M.,
... Alvarez-Lafuente, R. (2014). HERV-W Polymorphism in Chromosome X Is Associated
with Multiple Sclerosis Risk and with Differential Expression of MSRV. Retrovirology, 11(1),
2. Doi: 10.1186/1742-4690-11-2
6. Hegyi, H. (2013). GABBR1 Has a HERV-W LTR in Its Regulatory Region – a Possible Implication
for Schizophrenia. Biology Direct, 8(1), 5. Doi: 10.1186/1745-6150-8-5
7. Huang, W., Li, S., Hu, Y., Yu, H., Luo, F., Zhang, Q., & Zhu, F. (2011). Implication of the Env Gene
of the Human Endogenous Retrovirus W Family in the Expression of BDNF and DRD3 and
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