This document discusses epigenetics and genomic imprinting in the context of assisted reproductive technologies (ART). It provides background on epigenetics and how imprinting marks on genes from sperm and egg are established and maintained. Errors in imprinting establishment or maintenance can cause developmental disorders. The document reviews evidence that ART procedures like in vitro fertilization could potentially disturb imprinting by affecting gametes, early embryo development, or the maintenance of imprints. More research is needed using animal models and new techniques to better understand any risks and their underlying mechanisms.
PGD is a state-of-the-art procedure used in conjunction with In Vitro Fertilization (IVF) in which the embryo is tested for certain conditions prior to being placed in the womb of the woman.
INTRACYTOPLASMIC MORPHOLOGICALLY SELECTED SPERM INJECTION is a technique used in IVF treatment to examine and select sperm using a high-magnification digital imaging microscope for microinjection into the egg.
PGD is a state-of-the-art procedure used in conjunction with In Vitro Fertilization (IVF) in which the embryo is tested for certain conditions prior to being placed in the womb of the woman.
INTRACYTOPLASMIC MORPHOLOGICALLY SELECTED SPERM INJECTION is a technique used in IVF treatment to examine and select sperm using a high-magnification digital imaging microscope for microinjection into the egg.
PGD combines advances in Molecular genetics and in assisted reproductive technology and is conducted before the embryo is placed inside the womb of the woman.Pre implantation genetic diagnosis was introduced to prevent the inheritance of sex linked diseases
Sperm DNA Fragmentation (Oxidative stress, DNA damage and apoptosis, Test, Techniques, Relation to other semen parameters, Relationship to leucocytes, Relation to ICSI outcomes, Clinical applications, significance and limitations)
It was while performing SUZI that a single spermatozoon accidentally penetrated into the oolemma and provided the hint that a direct sperm injection would be more efficient.
1st successful birth by ICSI took place on Jan 14, 1992.
Preimplantation Genetic Diagnosis (PGD)/Screening (PGS) With IVFKaberi Banerjee
Pre-implantation genetic Screening (PGS) or Pre-implantation genetic diagnosis (PGD) plays an important role in increasing the chances of pregnancy for infertile couples.
Preimplantation genetic diagnosis (PGD) is a procedure used to diagnose embryos for known genetic disorders that both the patients and partners.
Read more: https://www.advancefertility.in/preimplantation-genetic-diagnosis-pgd-pgs-with-ivf/
PGD combines advances in Molecular genetics and in assisted reproductive technology and is conducted before the embryo is placed inside the womb of the woman.Pre implantation genetic diagnosis was introduced to prevent the inheritance of sex linked diseases
Sperm DNA Fragmentation (Oxidative stress, DNA damage and apoptosis, Test, Techniques, Relation to other semen parameters, Relationship to leucocytes, Relation to ICSI outcomes, Clinical applications, significance and limitations)
It was while performing SUZI that a single spermatozoon accidentally penetrated into the oolemma and provided the hint that a direct sperm injection would be more efficient.
1st successful birth by ICSI took place on Jan 14, 1992.
Preimplantation Genetic Diagnosis (PGD)/Screening (PGS) With IVFKaberi Banerjee
Pre-implantation genetic Screening (PGS) or Pre-implantation genetic diagnosis (PGD) plays an important role in increasing the chances of pregnancy for infertile couples.
Preimplantation genetic diagnosis (PGD) is a procedure used to diagnose embryos for known genetic disorders that both the patients and partners.
Read more: https://www.advancefertility.in/preimplantation-genetic-diagnosis-pgd-pgs-with-ivf/
“Inheritance” in images, from Darwin’s “tree of life” to DNA’s iconic crystallography to the epigenetic dynamicsHowever, the script needs to be interpreted and receives meaning only from the interplay with the environment
'GENETICS OF MALE & FEMALE INFERTILITY.pptxRahul Sen
This presentation briefs about an important aspect of infertility which deals about genes and its occurrence in future progeny. Genetics of Male & Female infertility which is not always discussed usually until unless a couple doesn't exhibit pregnancy losses or a major cause of infertility. lets read about Genetics of male and female infertility. Happy Reading <3
EXTRA CHROMOSOMAL INHERITANCE & GENOME IMPRINTINGBiswarup Nandi
Cytoplasmic Inheritance:
Imagine genetic information passing from a mother to her child. It happens through tiny structures called organelles in the cell.
These organelles have their own set of instructions, separate from the cell’s nucleus.
Why is this important? Because it affects how traits are inherited!
Genomic Imprinting:
Think of it like a “parental tag” on genes. Some genes behave differently depending on whether they come from the mother or the father.
Epigenetics plays a role here—it’s like a switch that can turn genes on or off.
This process affects development and can lead to certain diseases.
Remember, these concepts help scientists understand how our genes work and why we’re unique! 🧬
Introduction
Maternal Inheritance
Organellar inheritance
Mitochondrial inheritance
Chloroplast inheritance
Inheritance involving kappa particle
INTRODUCTION
DNA or RNA is the Genetic materials carrying information from
one generation to another.
Besides these two nucleic acids the cytoplasm also
contributes to the inheritance of some characters in some
organisms.
Extra chromosomal inheritance is also defined as nonmendelian inheritance
Inheritance due to genes located in cytoplasm plasmagenes.
The genes are located in DNA present in mitochondria and in chloroplasts these
are called organellar genes. This type of inheritance is also called as
cytoplasmic inheritance.
The evidence of cytoplasmic inheritance was first presented by Carl Correns in
mirabilis jalapa.
In 1943, Sonnenborn discovered Kappa Particles in Paramecium and they are
inherited through cytoplasm.
In cytoplasmic inheritance the character of female parent is only transmitted to
the progeny
MATERNAL INHERITANCE
The character of only one of the two parents (usually female parent) is
transmitted to their progeny.
It is usually referred to as extra-chromosomal or maternal or uniparental
inheritance.
The transmission of cytoplasm differs between sex cells:
Sperm or pollen transfer little or no cytoplasm to the zygote, but Egg
Contributes almost all of the cytoplasm to the zygote
This pattern of mtDNA inheritance is well known as "maternal
inheritance.
ORGANELLAR INHERITANCE
The cytoplasmic organelles like plastids (chloroplast) and
mitochondria are involved.
The cytoplasmic inheritance is governed by the genes of
mitochondria and chloroplast.
The genes which involve in cytoplasmic inheritance are called
plasma genes or cytoplasmic genes or extra nuclear genes.
EXMAPLES FOR NON-MENDELIAN INHERITANCE
Plastid inheritance in Mirabilis
Kappa particles in Paramecium
Shell coiling in Snail
Cytoplasmic male sterility in Maize
Milk factor in mice
CHLOROPLAST INHERITANCE
LEAF VARIEGATION IN MIRABILIS JALAPA
The evidence for cytoplasmic inheritance was first presented by Carl
Correns in Mirabilis jalapa (Four ‘O’ clock plant).
He observed a strange pattern of inheritance and studied inheritance
of leaf variegation
In M. jalapa, leaves may be g
Human Genome Engineering, Recent discoveries, Types of Designer babies, Methods used for Designer Babies, CRISPR, ETHICAL CONSIDERATION OF HUMAN GENOME ENGINEERING
ARTIFICIAL INTELLIGENCE IN HEALTHCARE.pdfAnujkumaranit
Artificial intelligence (AI) refers to the simulation of human intelligence processes by machines, especially computer systems. It encompasses tasks such as learning, reasoning, problem-solving, perception, and language understanding. AI technologies are revolutionizing various fields, from healthcare to finance, by enabling machines to perform tasks that typically require human intelligence.
- Video recording of this lecture in English language: https://youtu.be/lK81BzxMqdo
- Video recording of this lecture in Arabic language: https://youtu.be/Ve4P0COk9OI
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Ethanol (CH3CH2OH), or beverage alcohol, is a two-carbon alcohol
that is rapidly distributed in the body and brain. Ethanol alters many
neurochemical systems and has rewarding and addictive properties. It
is the oldest recreational drug and likely contributes to more morbidity,
mortality, and public health costs than all illicit drugs combined. The
5th edition of the Diagnostic and Statistical Manual of Mental Disorders
(DSM-5) integrates alcohol abuse and alcohol dependence into a single
disorder called alcohol use disorder (AUD), with mild, moderate,
and severe subclassifications (American Psychiatric Association, 2013).
In the DSM-5, all types of substance abuse and dependence have been
combined into a single substance use disorder (SUD) on a continuum
from mild to severe. A diagnosis of AUD requires that at least two of
the 11 DSM-5 behaviors be present within a 12-month period (mild
AUD: 2–3 criteria; moderate AUD: 4–5 criteria; severe AUD: 6–11 criteria).
The four main behavioral effects of AUD are impaired control over
drinking, negative social consequences, risky use, and altered physiological
effects (tolerance, withdrawal). This chapter presents an overview
of the prevalence and harmful consequences of AUD in the U.S.,
the systemic nature of the disease, neurocircuitry and stages of AUD,
comorbidities, fetal alcohol spectrum disorders, genetic risk factors, and
pharmacotherapies for AUD.
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.
TEST BANK for Operations Management, 14th Edition by William J. Stevenson, Ve...kevinkariuki227
TEST BANK for Operations Management, 14th Edition by William J. Stevenson, Verified Chapters 1 - 19, Complete Newest Version.pdf
TEST BANK for Operations Management, 14th Edition by William J. Stevenson, Verified Chapters 1 - 19, Complete Newest Version.pdf
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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!
Acute scrotum is a general term referring to an emergency condition affecting the contents or the wall of the scrotum.
There are a number of conditions that present acutely, predominantly with pain and/or swelling
A careful and detailed history and examination, and in some cases, investigations allow differentiation between these diagnoses. A prompt diagnosis is essential as the patient may require urgent surgical intervention
Testicular torsion refers to twisting of the spermatic cord, causing ischaemia of the testicle.
Testicular torsion results from inadequate fixation of the testis to the tunica vaginalis producing ischemia from reduced arterial inflow and venous outflow obstruction.
The prevalence of testicular torsion in adult patients hospitalized with acute scrotal pain is approximately 25 to 50 percent
Knee anatomy and clinical tests 2024.pdfvimalpl1234
This includes all relevant anatomy and clinical tests compiled from standard textbooks, Campbell,netter etc..It is comprehensive and best suited for orthopaedicians and orthopaedic residents.
These lecture slides, by Dr Sidra Arshad, offer a quick overview of physiological basis of a normal electrocardiogram.
Learning objectives:
1. Define an electrocardiogram (ECG) and electrocardiography
2. Describe how dipoles generated by the heart produce the waveforms of the ECG
3. Describe the components of a normal electrocardiogram of a typical bipolar leads (limb II)
4. Differentiate between intervals and segments
5. Enlist some common indications for obtaining an ECG
Study Resources:
1. Chapter 11, Guyton and Hall Textbook of Medical Physiology, 14th edition
2. Chapter 9, Human Physiology - From Cells to Systems, Lauralee Sherwood, 9th edition
3. Chapter 29, Ganong’s Review of Medical Physiology, 26th edition
4. Electrocardiogram, StatPearls - https://www.ncbi.nlm.nih.gov/books/NBK549803/
5. ECG in Medical Practice by ABM Abdullah, 4th edition
6. ECG Basics, http://www.nataliescasebook.com/tag/e-c-g-basics
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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.
2. Epigenetics
• ‘Epigenetics’ refers to a process that regulates
gene activity without affecting the genetic
(DNA) code and is heritable through cell
division.
• DNA-Gene- Genetic code- aminoacidprotein(gene expression)
3. • Functional asymmetry of mammalian parental
genomes.
• Non‐viability of uniparental embryo
development.
• A subset of our genes, ∼60 to date, is known
to be subject to genomic imprinting.
• The allele‐specific expression of a gene where
the allele that is expressed depends on
whether it is maternal or paternal in origin.
4. • The monoallelic expression of imprinted genes
results from the two parental alleles
maintaining different epigenetic profiles.
• Germ cell development and early
embryogenesis are crucial windows in the
erasure, acquisition and maintenance of
genomic imprints.
5. • A number of genes regulated by imprinting
have been shown to be essential to fetal
growth and placental function.
• Increasing attention has recently focused on
potential epigenetic disturbances resulting
from IVF/ICSI and embryo culture.
6. • Angelman syndrome (AS)
• Beckwith–Wiedemann syndrome (BWS) have
been documented in children conceived via
IVF and/or ICSI
7. Genomic Imprinting
• The functional and sex‐specific
non‐equivalence of imprinted alleles explains
the developmental failure of uniparental
embryos and confirms the requirement of
both parental genomes for normal
development .
8. • Genes expressed by the paternal genome are
directed towards the development of
extraembryonic tissues essential to support
the growth of the embryo, while the maternal
genome appears to be geared towards
expressing genes that contribute to proper
embryo development.
9. • The opposing tendencies of the male and
female genomes led to the development of
the most widely recognized theory of
imprinting, the ‘parental conflict’ hypothesis.
10. • This theory proposes that the paternal
genome has evolved to express genes that
favour the extensive use of maternal
resources and lead to optimal fetal
development and growth, thus ensuring
transmission of the father’s genes to the next
generation.
11. • On the other hand, genes expressed by the
maternal genome serve to counteract the
effort made by paternally expressed genes,
and limit investments in embryo development
and growth in favour of salvaging resources
for future pregnancies.
12. • Genomic imprinting is thought to be restricted
to mammals.
• Imprinting is an epigenetically controlled
phenomenon because something other than
DNA sequence must distinguish the parental
alleles and determine sex‐specific gene
expression.
13. • The role of DNA methylation in genomic
imprinting has been extensively investigated.
• In general, the two parental alleles have
different levels of DNA methylation.
• DNA methylation is a heritable yet reversible
epigenetic mark that can be stably propagated
after DNA replication and influence gene
expression
14. • Evidence suggests suggest co‐operation
between DNA methylation, histone
modifications, and overall chromatin state in
the regulation of imprinted gene
allele‐specific expression.
15. • Imprinted genes share common characteristic
features such as genomic clustering.
• A cluster on human chromosome 11p15 is
linked to the pathogenesis of BWS, and a
cluster on 15q11–13 is linked to the
AS/Prader–Willi syndromes (AS/PWS)
16. Imprint dynamics and timing during
gametogenesis and early embryogenesis
• Paternal imprints are complete by the haploid
phase of spermatogenesis.
• In the female germ line, imprint acquisition
occurs in the postnatal growth phase while
oocytes are arrested at the diplotene stage of
prophase I
17. • The overall methylation status of
non‐imprinted genes reaches a minimum at
the blastocyst stage of development after
which de novo methylation begins.
18. • During this wave of genome‐wide methylation
loss in the preimplantation embryo, imprinted
genes maintain the marks inherited from the
gametes, which finally translate into
monoallelic sex‐specific gene expression.
19. Mechanisms of genomic imprinting
• Enzyme involved in gene imprinting- DNA
methyl transferase.
• Erasure of imprints
• Erasure may take place over a very short time,
in as little as 24 h, at about the time when the
germ cells initially enter the gonad.
20. •
•
•
•
•
Acquisition of imprints
DNMT in male
Other mech in female
Maintenance of imprints
. Gene‐targeting studies indicate that DNMT1
is required for the maintenance of DNA
methylation patterns on imprinted and
non‐imprinted genes in the postimplantation
period
21. Errors in erasure, acquisition or
maintenance of imprints
• Defects at any of these stages may arise
because of problems with the machinery
(enzymes) responsible for erasing, setting
down, or maintaining imprints. Alternatively,
epigenetic insults may cause changes in the
methylation status or chromatin conformation
within imprinted genes, leading to abnormal
(i.e. other than monoallelic) expression
patterns.
22. • Evidence suggests that imprinting defects may
occur sporadically in normal embryos and that
the processes of imprint erasure,
establishment and maintenance are
vulnerable to errors.
• It is difficult to envisage a mechanism that
would allow damaged imprints to be repaired
post‐zygotically in the embryo.
23. Roles of imprinted genes in fetal development,
placental function and human disease
•
•
•
•
Fetal development
IGF2
Placental function
Imprinted genes play essential roles in
controlling the placental supply of maternal
nutrients to the fetus, by regulating the
growth of the placenta. For eg. Tssc3
24. • Imprinted genes play important roles in the
placenta to control the balance between
supply and demand for nutrients, suggesting
that defects in imprinted genes expressed in
the placenta may be associated with clinical
syndromes such as intrauterine growth
retardation (IUGR).
25. • Human disease
• Angelman syndrome
• Prader willi Syndrome Chromosome 15 long
arm.
• Beckwith Weidman syndrome(overgrowth
disorder+ childhood cancer)
• Numner of imprinted genes are expressed in
extra embryonic tissues and the nervous
system.
26. Imprinting defects in uniparental and
molar pregnancies
• Spontaneous uniparental development has
been well documented in humans
• Ovarian teratomas are the product of
gynogenetic development derived from the
parthenogenetic activation of an unfertilized
oocyte within the ovary.
• No evidence of extraembryonically derived
tissues.
27. • Human androgenetic conceptuses exhibit
hyperplasia of extraembryonic trophoblastic
tissues with a lack of embryo developmentComplete mole
28. Evidence of imprinting defects associated with
assisted reproductive technology procedures
• Animal studies
• lambs and calves , overgrowth abnormalities,
‘large offspring syndrome’.
• Human studies
• AS, BWS- IVF/ICSI children.
29. • Imprinting defects in humans potentially
brought about by embryo culture and other
manipulations may be more likely to perturb
imprinted genes regulated by maternal
methylation.
30. • To address underlying mechanisms, one would
like to know whether specific techniques used
in human ART predispose embryos to
epigenetic defects.
• To date, the numbers of cases of assisted
reproductive technology‐conceived children
with imprinting defects are too small to allow
such an analysis.
31. • Possible effects of assisted reproductive
technology on male germ cells
• It is unlikely that assisted reproductive
technology involving male gametes (e.g. the use
of surgically obtained elongated spermatids or
immature sperm) interferes with either the
erasure or acquisition of imprints, as both
processes appear to be complete by the
spermatid phase of spermatogenesis
32. • Freezing of mature sperm- Chromatin
damage.
• ICSI could include disruption of the oocyte
cytoskeleton, the introduction of exogenous
material into the early embryo or the leakage
of cytoplasm, events that could lead to loss or
inability of enzymes, i.e. DNMT, to maintain
imprints during preimplantation development
33. • Possible effects of assisted reproductive
technology on female germ cells
• The two important processes associated with
imprinting that occur during oocyte growth
are the acquisition of maternal methylation
imprints and the protection of imprinted
genes that are normally unmethylated in the
female germ line (e.g. H19) from becoming
methylated
34. • Gonadotropins could cause the premature
release of oocytes that had not completed the
imprinting process.
• Genes that acquire their imprints late in
oocyte development would be predicted to be
the most sensitive to hormone‐induced
perturbations
35. Possible effects of assisted reproductive
technology on early embryogenesis
• Preimplantation embryo development
coincides with the time when gametic
methylation imprints must be maintained,
while most of the remainder of the genome is
being stripped of its methylation.
36. • Possible adverse effects of embryo
manipulation, cryopreservation or culture
include the lack of maintenance of imprints
that were acquired during gametogenesis, a
perturbation of existing imprints, and a lack of
protection of the normally unmethylated
allele
37. • Although it has not been examined
experimentally, embryo cryopreservation
could potentially affect the cytoskeleton and
the availability of enzymes associated with
methylation and demethylation of the
genome during preimplantation development.
38. Studies required
• There is clearly a need for more basic research
on animal gametes and embryos to model
procedures (e.g. ICSI, cryopreservation,
superovulation, embryo culture) used in
human assisted reproductive technology and
test for effects on imprinted gene expression
and methylation
39. • The mouse is an excellent model but other
models where early embryo development may
be more similar to human, such as bovine or
non‐human primate, should also be examined.
40. • Techniques such as bisulphite genomic
sequencing and PCR‐based expression assays
now permit imprinting abnormalities to be
assessed in single blastocysts.
• These advances may allow critical human
studies to be performed using single embryos.