ONCOGENE AND PROTOONCOGENE
P53 GENE AND ITS APPLICATION IN CANCER ETIOLOGY
TUMOUR SUPPRESSOR GENE AND BCA AND BAC GENE AND ITS APPLICATION ON THE APOPTOSIS AND DEATH RECEPTORS
An oncogene is a gene that has the potential to cause cancer. In tumor cells, they are mutated or expressed at high levels. Most normal cells undergo a programmed form of rapid cell death (apoptosis) when critical functions are altered.
An oncogene is a gene that has the potential to cause cancer. In tumor cells, they are mutated or expressed at high levels. Most normal cells undergo a programmed form of rapid cell death (apoptosis) when critical functions are altered.
Introduction
History
Tumor suppressor gene- pRB
- RB gene
- Role of RB in regulation of cell cycle
- Tumor associated with RB gene mutation
Tumor suppressor gene- p53
- What is p53 gene?
- Function of p53 gene
- How it regulates cell cycle
- What happen if p53 gene inactivated
- Cancer associated with p53 mutation
- Conclusion
- References
p53 has been described as “GUARDIAN ANGEL OF THE GENOME”
because it performs following mechanism:
DNA Repair
Cell growth arrest
Apoptosis (programmed cell death)
P53 is also known as cellular tumour antigen Ag, phosphoprotein
P53 or tumour suppressor p53.
P53 protein is encoded by TP53.
This presentation is about the transcription machinery that is required for the transcription in eukaryotes. The comparison between the transcription factors involved in prokaryotes and eukaryotes. The initiation of transcription and how it helps in producing a mRNA.
Introduction
History
Tumor suppressor gene- pRB
- RB gene
- Role of RB in regulation of cell cycle
- Tumor associated with RB gene mutation
Tumor suppressor gene- p53
- What is p53 gene?
- Function of p53 gene
- How it regulates cell cycle
- What happen if p53 gene inactivated
- Cancer associated with p53 mutation
- Conclusion
- References
p53 has been described as “GUARDIAN ANGEL OF THE GENOME”
because it performs following mechanism:
DNA Repair
Cell growth arrest
Apoptosis (programmed cell death)
P53 is also known as cellular tumour antigen Ag, phosphoprotein
P53 or tumour suppressor p53.
P53 protein is encoded by TP53.
This presentation is about the transcription machinery that is required for the transcription in eukaryotes. The comparison between the transcription factors involved in prokaryotes and eukaryotes. The initiation of transcription and how it helps in producing a mRNA.
Cancer (Concept of oncogenes and tumor suppressor genes with special referenc...RubinSahu5
Cancer (Concept of oncogenes and tumor suppressor genes with special referencetop53, Retinoblastoma and Ras and APC)
Cancer is a non-infectious disease. It starts at the molecular level of the cell and, ultimately affects the cellular behavior.
It can be defined as uncontrolled proliferation of cells without any differentiation.
Cancer is a genetic disease because it can be traced to alterations within specific genes.
Most cancer cells experience a breakdown in all of these regulatory influences that protect the body from chaos and self‐destruction.
Cancer cells proliferate uncontrollably, producing Malignant tumors that invade surrounding healthy tissue.
Malignant tumors tend to metastasize, that is, to spawn renegade cells that break away from the parent mass, enter the lymphatic or vascular circulation, and spread to distant sites in the body where they establish lethal secondary tumors that are no longer amenable to surgical removal.
All types of cancer can result from uncontrolled Cell Growth And Division of any of the different kinds of cells in the body.
The uncontrolled cell growth produces a mass of cells which are called tumors or neoplasm tumors may be Benign or Malignant.
Oncogenes encode proteins that promote the loss of growth control and the conversion of a cell to a malignant state and Cell Proliferation.
Oncogenes may lead to genetic instability, prevent a cell from becoming a victim of apoptosis, or promote metastasis.
Tumor‐suppressor genes act as a cell’s brakes; they encode proteins that restrain cell growth and prevent cells from becoming malignant.
The first tumor suppressor gene to be studied and eventually cloned is associated with a rare childhood cancer of the retina of the eye, called Retinoblastoma.
The gene responsible for this disorder is named RB .
RAS refers to a family of genes that encode proteins involved in cell signaling pathways regulating cell growth and differentiation.
APC stands for Adenomatous Polyposis Coli.
It's a tumor suppressor gene that plays a critical role in regulating cell proliferation and maintaining the integrity of the epithelial lining of the colon and rectum.
Mutations in the APC gene are associated with familial adenomatous polyposis (FAP), an inherited condition characterized by the development of numerous polyps in the colon and rectum, leading to a significantly increased risk of colorectal cancer.
The cells of patients with this condition were found to contain a deletion of a small portion of chromosome 5, which was subsequently identified as the site of a tumor‐suppressor gene called Adenomatous Polyposis Coli, or APC .
APC is known to suppress the Wnt pathway, which activates the transcription of genes, that promote cell proliferation.
Loss of APC function could therefore lead directly to abnormal chromosome segregation and aneuploidy.
describe the tumor suppressor genes and examples for downloading the presentation, more presentations , infographics and blogs visit :
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Introduction to Cancer
Stem cells and cancer cells
major pathways that lead to formation of tumors.
Tumor Supressors
Colon cancer to prove Knudson hypothesis.
The modern treatments available to treat cancer.
This presentation is targeted for MBBS, MD and BDS students that describes briefly about aetiopathogenesis, tumour markers, anti cancer agents, apoptosis
Respiratory stimulants: types, complete discussion on indications, contraindications, assessment, patient notes and examples of stimulants both central and respiratory
Expectorants and Antitussives: types, complete discussion on indications, contraindications, assessment, patient notes and examples of expectorants and antitussives
Complete pharmacology of Non steroidal Anti inflammatory Drugs, classification, Mechanism of action, Pharmacological actions, Indications, Contraindications, Adverse effects
Pharmacology laboratory experiment, both invivo and invitro includes interpolation, matching , bracketing, three point, four point bioassays with a note on hypoglycemic activity, acute skin irritation, acute eye irritaiton, pyrogen test, gastrointestinal motility test, physiological salt solutions
Tom Selleck Health: A Comprehensive Look at the Iconic Actor’s Wellness Journeygreendigital
Tom Selleck, an enduring figure in Hollywood. has captivated audiences for decades with his rugged charm, iconic moustache. and memorable roles in television and film. From his breakout role as Thomas Magnum in Magnum P.I. to his current portrayal of Frank Reagan in Blue Bloods. Selleck's career has spanned over 50 years. But beyond his professional achievements. fans have often been curious about Tom Selleck Health. especially as he has aged in the public eye.
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Introduction
Many have been interested in Tom Selleck health. not only because of his enduring presence on screen but also because of the challenges. and lifestyle choices he has faced and made over the years. This article delves into the various aspects of Tom Selleck health. exploring his fitness regimen, diet, mental health. and the challenges he has encountered as he ages. We'll look at how he maintains his well-being. the health issues he has faced, and his approach to ageing .
Early Life and Career
Childhood and Athletic Beginnings
Tom Selleck was born on January 29, 1945, in Detroit, Michigan, and grew up in Sherman Oaks, California. From an early age, he was involved in sports, particularly basketball. which played a significant role in his physical development. His athletic pursuits continued into college. where he attended the University of Southern California (USC) on a basketball scholarship. This early involvement in sports laid a strong foundation for his physical health and disciplined lifestyle.
Transition to Acting
Selleck's transition from an athlete to an actor came with its physical demands. His first significant role in "Magnum P.I." required him to perform various stunts and maintain a fit appearance. This role, which he played from 1980 to 1988. necessitated a rigorous fitness routine to meet the show's demands. setting the stage for his long-term commitment to health and wellness.
Fitness Regimen
Workout Routine
Tom Selleck health and fitness regimen has evolved. adapting to his changing roles and age. During his "Magnum, P.I." days. Selleck's workouts were intense and focused on building and maintaining muscle mass. His routine included weightlifting, cardiovascular exercises. and specific training for the stunts he performed on the show.
Selleck adjusted his fitness routine as he aged to suit his body's needs. Today, his workouts focus on maintaining flexibility, strength, and cardiovascular health. He incorporates low-impact exercises such as swimming, walking, and light weightlifting. This balanced approach helps him stay fit without putting undue strain on his joints and muscles.
Importance of Flexibility and Mobility
In recent years, Selleck has emphasized the importance of flexibility and mobility in his fitness regimen. Understanding the natural decline in muscle mass and joint flexibility with age. he includes stretching and yoga in his routine. These practices help prevent injuries, improve posture, and maintain mobilit
Flu Vaccine Alert in Bangalore Karnatakaaddon Scans
As flu season approaches, health officials in Bangalore, Karnataka, are urging residents to get their flu vaccinations. The seasonal flu, while common, can lead to severe health complications, particularly for vulnerable populations such as young children, the elderly, and those with underlying health conditions.
Dr. Vidisha Kumari, a leading epidemiologist in Bangalore, emphasizes the importance of getting vaccinated. "The flu vaccine is our best defense against the influenza virus. It not only protects individuals but also helps prevent the spread of the virus in our communities," he says.
This year, the flu season is expected to coincide with a potential increase in other respiratory illnesses. The Karnataka Health Department has launched an awareness campaign highlighting the significance of flu vaccinations. They have set up multiple vaccination centers across Bangalore, making it convenient for residents to receive their shots.
To encourage widespread vaccination, the government is also collaborating with local schools, workplaces, and community centers to facilitate vaccination drives. Special attention is being given to ensuring that the vaccine is accessible to all, including marginalized communities who may have limited access to healthcare.
Residents are reminded that the flu vaccine is safe and effective. Common side effects are mild and may include soreness at the injection site, mild fever, or muscle aches. These side effects are generally short-lived and far less severe than the flu itself.
Healthcare providers are also stressing the importance of continuing COVID-19 precautions. Wearing masks, practicing good hand hygiene, and maintaining social distancing are still crucial, especially in crowded places.
Protect yourself and your loved ones by getting vaccinated. Together, we can help keep Bangalore healthy and safe this flu season. For more information on vaccination centers and schedules, residents can visit the Karnataka Health Department’s official website or follow their social media pages.
Stay informed, stay safe, and get your flu shot today!
Ozempic: Preoperative Management of Patients on GLP-1 Receptor Agonists Saeid Safari
Preoperative Management of Patients on GLP-1 Receptor Agonists like Ozempic and Semiglutide
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New Directions in Targeted Therapeutic Approaches for Older Adults With Mantl...i3 Health
i3 Health is pleased to make the speaker slides from this activity available for use as a non-accredited self-study or teaching resource.
This slide deck presented by Dr. Kami Maddocks, Professor-Clinical in the Division of Hematology and
Associate Division Director for Ambulatory Operations
The Ohio State University Comprehensive Cancer Center, will provide insight into new directions in targeted therapeutic approaches for older adults with mantle cell lymphoma.
STATEMENT OF NEED
Mantle cell lymphoma (MCL) is a rare, aggressive B-cell non-Hodgkin lymphoma (NHL) accounting for 5% to 7% of all lymphomas. Its prognosis ranges from indolent disease that does not require treatment for years to very aggressive disease, which is associated with poor survival (Silkenstedt et al, 2021). Typically, MCL is diagnosed at advanced stage and in older patients who cannot tolerate intensive therapy (NCCN, 2022). Although recent advances have slightly increased remission rates, recurrence and relapse remain very common, leading to a median overall survival between 3 and 6 years (LLS, 2021). Though there are several effective options, progress is still needed towards establishing an accepted frontline approach for MCL (Castellino et al, 2022). Treatment selection and management of MCL are complicated by the heterogeneity of prognosis, advanced age and comorbidities of patients, and lack of an established standard approach for treatment, making it vital that clinicians be familiar with the latest research and advances in this area. In this activity chaired by Michael Wang, MD, Professor in the Department of Lymphoma & Myeloma at MD Anderson Cancer Center, expert faculty will discuss prognostic factors informing treatment, the promising results of recent trials in new therapeutic approaches, and the implications of treatment resistance in therapeutic selection for MCL.
Target Audience
Hematology/oncology fellows, attending faculty, and other health care professionals involved in the treatment of patients with mantle cell lymphoma (MCL).
Learning Objectives
1.) Identify clinical and biological prognostic factors that can guide treatment decision making for older adults with MCL
2.) Evaluate emerging data on targeted therapeutic approaches for treatment-naive and relapsed/refractory MCL and their applicability to older adults
3.) Assess mechanisms of resistance to targeted therapies for MCL and their implications for treatment selection
Pulmonary Thromboembolism - etilogy, types, medical- Surgical and nursing man...VarunMahajani
Disruption of blood supply to lung alveoli due to blockage of one or more pulmonary blood vessels is called as Pulmonary thromboembolism. In this presentation we will discuss its causes, types and its management in depth.
Couples presenting to the infertility clinic- Do they really have infertility...Sujoy Dasgupta
Dr Sujoy Dasgupta presented the study on "Couples presenting to the infertility clinic- Do they really have infertility? – The unexplored stories of non-consummation" in the 13th Congress of the Asia Pacific Initiative on Reproduction (ASPIRE 2024) at Manila on 24 May, 2024.
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MANAGEMENT OF ATRIOVENTRICULAR CONDUCTION BLOCK.pdfJim Jacob Roy
Cardiac conduction defects can occur due to various causes.
Atrioventricular conduction blocks ( AV blocks ) are classified into 3 types.
This document describes the acute management of AV block.
2. ONCOGENE AND TUMOR SUPPRESSOR GENES
Cancer is a genetic disease and is mostly caused by somatic mutations.
The characteristic properties of cancer cells - consequences of genetic changes in the
tumor cells - Genomic instability
Self-sufficient proliferation of growth
Refractory to inhibitory signals
Survival without survival signals
Unlimited replicative potential
Recruitment of blood supply
Invasion and metastasis
Cancer cells contain multiple alterations in the number and structure of genes and
chromosomes, mainly acquired by mutations in somatic cells.
Individual genes display point mutations such as base changes, insertions and deletions,
or can be affected by chromosomal translocations or inversions.
These changes lead to the
expression of altered gene products,
decreased or increased gene expression
novel gene products like fusion proteins.
Two classes of genes affected by genetic and epigenetic alterations in cancer cells are
oncogenes and tumor suppressor genes.
Oncogenes contribute to tumor development by increased or misdirected activity.
Tumor suppressors - insufficient or lost function supports tumor development.
Typically, in human cancers activation of oncogenes and inactivation of tumor
suppressor genes - both are observed.
3. Oncogenes are cellular or viral (i.e., inserted into the cell by a virus) genes; their
expression can cause the development of cancer.
Proto-oncogenes are normal cellular genes - conversion to oncogenes occur via several
mechanisms. Gain-of-function mutations of protooncogenes stimulate cells to multiply.
Tumor suppressors (anti-oncogenes) are cellular genes; their inactivation increases the
probability of tumor formation. Loss-offunction mutations – relieve cells of control in
replication.
About one hundred potential oncogenes (cellular and viral) and thirty tumor suppressors
have been recognized.
Tumor suppressors are guardians against DNA damage.
Slows or inhibits cell proliferation and prevents damaged or abnormal cells from
becoming malignant.
Monitor DNA damage and help repair the damage before cells divide.
Induce growth arrest at two DNA damage checkpoints: the first gap phase (G1) and the
second gap phase (G2) of the cell cycle. This enables cells to check the integrity of the
chromosomes before proceeding into DNA replication (S phase) or division (M phase).
4. FUNCTIONS OF TUMOR-SUPPRESSOR PROTEINS
Repression of genes that are essential for the continuing of the cell cycle,
effectively inhibiting cell division.
Coupling the cell cycle to DNA damage. Cell should not divide with damaged DNA
- the cell cycle continue once it is repaired.
If the damage cannot be repaired, the cell should initiate apoptosis (programmed cell
death) to remove the threat it poses for the greater good of the organism.
Metastasis suppressors prevent tumor cells from dispersing, block loss of contact
inhibition, and inhibit metastasis.
DNA repair proteins are usually classified as tumor suppressors. HNPCC, MEN1 and
BRCA.
The functional inactivation of tumor suppressors by Genetic (gene mutation or
deletion, mutations in the promoter of genes) or epigenetic alterations (promoter
methylation, mutations in the promoter of genes) – creates imbalance between
proliferation, cell death, and differentiation programs that facilitates tumorigenesis.
Individuals born with mutations in tumor-suppressor genes are predisposed to cancer.
Tumor suppressors represent about 0.001% of the total number of genes (around
30,000) that make up the entire mammalian genome. About 30 tumor suppressors are
known.
THE “TWO HITS” HYPOTHESIS: LOSS OF HETEROZYGOSITY
The Knudson hypothesis - cancer is the result of accumulated mutations to a cell's
DNA.
Two mutations are required for the development of retinoblastoma
Familial retinoblastoma
Mutated allele from one parent (the first hit) in retinoblastoma (RB) gene -
Heterozygosity - not sufficient to cause tumor - child is initially asymptomatic.
A second mutation or deletion on the other RB allele (second hit) – loss of function of
both alleles –loss of heterozygosity (LOH) –development of tumor.
Nonfamilial or “sporadic” retinoblastoma
Somatic mutations on both alleles (two hits) in retinal cells - disease is not transmitted
to the next generation.
5. HAPLOINSUFFICIENCY IN CANCER
Appearance of a phenotype in cells or an organism when only one of the two gene copies
(alleles) is inactivated.
For some tumor suppressor genes, the loss of a single allele is sufficient to induce
susceptibility to tumor formation - these are haploinsufficient tumor-suppressor
genes.
Inactivation of one allele can be achieved by genetic (i.e. mutation or deletion) or
epigenetic (transcriptional silencing by methylation, repressor complexes, or mutations
in the promoter
region) events.
EPIGENETIC EVENTS
Epigenetic regulation of genes - methylation, repressor complexes, or mutations of the
promoter regions – reduce messenger RNA transcription - reduction or loss of protein
expression.
Methylation occurs on the cytosine nucleotide of CpG pairs usually located in promoter
regions, resulting in transcriptional silencing.
Mutations in the promoter region can affect binding of transcription factors to specific
DNA binding domains.
6. Repressor protein complexes bind to the promoter regions of affected genes -
Transcriptional repression .
Epigenetic events are linked to cancer development and are equally important in the
process of carcinogenesis.
Eg. tumor suppressor p16INK4A or p14ARF - silenced by methylation of their
promoters or by active transcriptional repression by repressor protein complexes.
RETINOBLASTOMA PROTEIN is important in the control of proliferation and
development of not only retinal cells, but also other tissues.
Retinoblastoma - large deletions of coding exons or point mutations - loss of the
messenger RNA or the expression of a nonfunctional pRb protein.
Children with germ-line RB mutations are at higher risk of developing osteosarcomas
later in adolescence.
Certain sporadic human tumors with RB mutations - carcinomas of the bladder, breast,
and in particular small-cell lung carcinomas.
The retinoblastoma protein plays a critical role in the control of neoplasia in a variety
of tissues.
p53/TP53
“The guardian of the genome” - a transcription factor – its loss leads to genomic
instability and increased mutagenesis.
Restrains uncontrolled cell growth – block cell cycle and induce apoptosis.
Sense multiple cellular stresses (genotoxic stress e.g., UV, X-ray, carcinogens, and
cytotoxic drugs) or oncogenic stresses (hyperproliferative signals from oncogenes ).
7. In response to stress, the p53 protein is stabilized and activated - induce a set of genes
involved in cell cycle arrest, DNA repair, or apoptosis.
p53 is inactivated in most human cancers (50% of tumors) as a result of mutations in
the TP53 gene, or through binding to viral proteins.
Tumor suppressor activity of p53 is due to its ability to induce Apoptosis
The phosphatase PTEN (phosphatase and Tensin homolog) negatively regulates cell
proliferation.
Loss of PTEN function is common in several cancer types.
Somatic inactivating mutations in PTEN are frequently found in glioblastoma,
endometrial carcinoma, and prostate adenocarcinoma, in sporadic cancers of the
breast, thyroid, lung, stomach, and blood.
BRCA1 and BRCA2 are tumor suppressor genes and are involved in DNA repair of double-
strand breaks.
Mutations in BRCA1 (chromosome 17) and/or BRCA2 (chromosome 13) cause
decreased stability of the human genome and result in dangerous gene rearrangements
that can lead
to hematologic cancers.
A BRCA mutation is a mutation in either of the genes, BRCA1 and BRCA2.
8.
9. Heterozygous germline mutations in either the BRCA1 or BRCA2 genes - high risk
for breast and ovarian cancer phenotypes - exhibit loss of heterozygosity (LOH).
REGRESSING TUMORS BY ACTIVATING TUMOR SUPPRESSOR GENES – A
THERAPEUTIC TARGET
Preclinical studies both in vitro and in vivo have shown that restoring p53 function can
induce apoptosis in cancer cells.
P53 gene therapy for lung cancer, hepatocellular carcinoma using viral delivery
system.
However, resistance develops in many patients, suggesting that combination of such
gene-targeted therapies may be required.