Book contents
- Frontmatter
- Dedication
- Contents
- List of Contributors
- Preface
- Section 1 Historical perspective
- Section 2 Life cycle
- Section 3 Developmental biology
- Section 4 Imprinting and reprogramming
- Section 5 Pathology
- 24 Gene expression in human oocytes
- 25 Omics as tools for oocyte selection
- 26 The legacy of mitochondrial DNA
- 27 Relative contribution of advanced age and reduced follicle pool size on reproductive success
- 28 Cellular origin of age-related aneuploidy in mammalian oocytes
- 29 Alterations in the gene expression of aneuploid oocytes and associated cumulus cells
- 30 Transgenerational risks by exposure in utero
- 31 Obesity and oocyte quality
- 32 Safety of ovarian stimulation
- 33 Oocyte epigenetics and the risks for imprinting disorders associated with assisted reproduction
- 34 Genetic basis for primary ovarian insufficiency
- Section 6 Technology and clinical medicine
- Index
- References
33 - Oocyte epigenetics and the risks for imprinting disorders associated with assisted reproduction
from Section 5 - Pathology
Published online by Cambridge University Press: 05 October 2013
- Frontmatter
- Dedication
- Contents
- List of Contributors
- Preface
- Section 1 Historical perspective
- Section 2 Life cycle
- Section 3 Developmental biology
- Section 4 Imprinting and reprogramming
- Section 5 Pathology
- 24 Gene expression in human oocytes
- 25 Omics as tools for oocyte selection
- 26 The legacy of mitochondrial DNA
- 27 Relative contribution of advanced age and reduced follicle pool size on reproductive success
- 28 Cellular origin of age-related aneuploidy in mammalian oocytes
- 29 Alterations in the gene expression of aneuploid oocytes and associated cumulus cells
- 30 Transgenerational risks by exposure in utero
- 31 Obesity and oocyte quality
- 32 Safety of ovarian stimulation
- 33 Oocyte epigenetics and the risks for imprinting disorders associated with assisted reproduction
- 34 Genetic basis for primary ovarian insufficiency
- Section 6 Technology and clinical medicine
- Index
- References
Summary
Introduction
As a treatment for female infertility, assisted reproductive technology (ART) commonly uses a number of treatments and manipulations, including hormonal stimulation of follicular development and ovulation, cryopreservation, in vitro maturation (IVM), in vitro fertilization (IVF)/intracytoplasmic sperm injection (ICSI) and embryo culture, all of which could adversely affect oocyte development or function during early embryogenesis. Over the last decade, concern has been raised about possible increases in the occurrence of rare genomic imprinting disorders, in particular Beckwith–Wiedemann syndrome (BWS) and Angelman syndrome (AS), in ART-conceived children. The genomic imprinting disorders seen in children conceived using ART were accompanied in many cases by a loss of maternal DNA methylation at imprinted loci. Genomic imprinting refers to the acquisition of a unique epigenetic profile in a small subset of genes during gametogenesis. This differential epigenetic mark in the gametes results in a parent-of-origin-specific expression of these imprinted genes in the offspring. Most imprinted genes exist in clusters in the genome and their allele-specific expression is regulated by sequence elements called imprinting control regions (ICRs). Genomic imprinting is under the control of epigenetic mechanisms including DNA methylation at ICRs, also known as differentially methylated domains or regions (DMDs, DMRs). One of the best studied epigenetic mechanisms, DNA methylation, is heritable and reversible and susceptible to being perturbed during development. At most ICRs, DNA methylation occurs in the female germ line and is inherited from the mother. Following fertilization, male and female gametic imprints must be maintained through preimplantation development and into adulthood. Thus any factor that affects the ability of oocytes to acquire imprints or normal epigenetic patterns during oogenesis or maintain these patterns after fertilization could potentially predispose to imprinting disorders in the offspring. This chapter reviews current data on the effects of ART on genomic imprinting in humans, along with the human and animal research that is beginning to help explain how perturbations in oocyte biology may be linked to the etiology of ART-associated epigenetic dysregulation and abnormalities in genomic imprinting.
- Type
- Chapter
- Information
- Biology and Pathology of the OocyteRole in Fertility, Medicine and Nuclear Reprograming, pp. 384 - 393Publisher: Cambridge University PressPrint publication year: 2013
References
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