Several studies have linked assisted reproductive technologies to aberrant imprinting. We previously showed that 12-day in vitro follicle culture supports normal imprinting establishment in mouse oocytes. The aim of the present study was to assess whether shortened in vitro follicle growth (8 days of culture compared with 12 days, as a model for human in vitro maturation) or preovulatory intrafollicular oocyte "aging" in culture (14 days of culture) leads to imprinting mutations in oocytes. Limiting-dilution bisulphite sequencing showed that shortened in vitro follicle growth (8 days) does not induce oocyte epimutations at the imprinted Snrpn and Mest genes. In contrast, extension of oocyte residence in large unluteinized follicles in vitro was associated with a low level (1 of 54 alleles) of epimutations for Mest but not for Snrpn. The latter condition may occur during controlled ovarian stimulation where the oocyte growth phase may be extended for several days. Furthermore, we studied the dynamics during follicle culture of transcript levels for genes previously shown to be essential for imprinting establishment in oocytes, including Dnmt3a, Dnmt3L, and Zfp57. Oocyte total mRNA levels during in vitro follicle culture showed the timely shutdown in transcription at the antral follicle stage, and total mRNA levels were comparable to those of in vivo grown equine chorionic gonadotropin-stimulated oocytes.

Download full-text PDF

Source
http://dx.doi.org/10.1095/biolreprod.113.111641DOI Listing

Publication Analysis

Top Keywords

vitro follicle
16
imprinting establishment
12
follicle culture
12
establishment mouse
8
mouse oocytes
8
shortened vitro
8
follicle growth
8
growth days
8
days culture
8
total mrna
8

Similar Publications

Background: To a large extent, the ovarian reserve determines a woman's reproductive potential. The etiological and pathological mechanisms of diminished ovarian reserve (DOR) remain unclear, and no reliable treatment is currently available for DOR. Adipokines and cytokines in follicular fluid (FF) play pivotal roles in follicular development and maturation.

View Article and Find Full Text PDF

Triggering final follicular maturation for IVF cycles.

Reprod Biol Endocrinol

January 2025

Infertility and IVF Unit, Department of Obstetrics and Gynecology, Chaim Sheba Medical Center (Tel Hashomer), Ramat Gan, 52621, Israel.

As part of a conventional controlled ovarian hyperstimulation (COH) regimen, final follicular maturation is usually triggered by a single bolus dose of human chorionic gonadotropin (hCG). COH, which combines GnRH antagonist co-treatment with GnRH agonist(GnRHa) trigger, is often used in attempts to eliminate severe early ovarian hyperstimulation syndrome and to improve oocyte/embryo yield and quality. Recently, the combination of GnRHa, with hCG trigger has also been implemented into clinical practice.

View Article and Find Full Text PDF

Polycystic ovary syndrome is one of the most common endocrine disorders in women of reproductive age, characterized by functional and structural alterations of the female reproductive organs. Due to the unknown underlying molecular mechanisms, in vivo murine models and in vitro human cellular models are developed to study the syndrome. These models are used to analyze various aspects of the pathology by replicating the conditions of the syndrome.

View Article and Find Full Text PDF

A Homozygous Variant in HSD17B1 Identified in Women With Poor Ovarian Response.

Clin Genet

January 2025

NHC Key Laboratory of Human Stem Cell and Reproductive Engineering, School of Basic Medical Sciences, Central South University, ChangSha, China.

An increasing number of patients utilizing in vitro fertilization (IVF) and assisted reproductive technology (ART) are characterized as impaired or poor ovarian responders (PORs). Owing to its unclear molecular etiology, the management of patients with age-related ovarian characteristics remains a controversial and complex clinical concern. Therefore, it is important to identify and understand the etiological causes behind POR to develop more effective and efficient management strategies for these patients.

View Article and Find Full Text PDF

Familial Mediterranean fever (FMF) is an autoinflammatory disease characterized by periodic fever, serositis, and arthritis. In women, FMF attacks can sometimes be triggered by the menstrual cycle. Once diagnosed, prophylactic treatment with colchicine is generally recommended.

View Article and Find Full Text PDF

Want AI Summaries of new PubMed Abstracts delivered to your In-box?

Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!