DNA methylation and mRNA expression of imprinted genes in blastocysts derived from an improved in vitro maturation method for oocytes from small antral follicles in polycystic ovary syndrome patients

AbstractSTUDY QUESTIONDoes imprinted DNA methylation or imprinted gene expression differ between human blastocysts from conventional ovarian stimulation (COS) and an optimized two-step IVM method (CAPA-IVM) in age-matched polycystic ovary syndrome (PCOS) patients?SUMMARY ANSWERNo significant differences in imprinted DNA methylation and gene expression were detected between COS and CAPA-IVM blastocysts.WHAT IS KNOWN ALREADYAnimal models have revealed alterations in DNA methylation maintenance at imprinted germline differentially methylated regions (gDMRs) after use of ARTs. This effect increases as more ART interventions are applied to oocytes or embryos. IVM is a minimal-stimulation ART with reduced hormone-related side effects and risks for patients. CAPA-IVM is an improved IVM system that includes a pre-maturation step (CAPA), followed by an IVM step, both in the presence of physiological compounds that promote oocyte developmental capacity.STUDY DESIGN, SIZE, DURATIONFor DNA methylation analysis 20 CAPA-IVM blastocysts were compared to 12 COS blastocysts. For RNA-Seq analysis a separate set of 15 CAPA-IVM blastocysts were compared to 5 COS blastocysts.PARTICIPANTS/MATERIALS, SETTING, METHODSCOS embryos originated from 12 patients with PCOS (according to Rotterdam criteria) who underwent conventional ovarian stimulation. For CAPA-IVM 23 women were treated for 3 –5 days with highly purified hMG (HP-hMG) and no hCG trigger was given before oocyte retrieval. Oocytes...
Source: Human Reproduction - Category: Reproduction Medicine Source Type: research

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AbstractWhile childbearing protects against risk of epithelial ovarian cancer (EOC), few studies have explored the impact on maternal EOC risk of sex of offspring, which may affect the maternal environment during pregnancy. We performed a pooled analysis among parous participants from 12 case –controls studies comprising 6872 EOC patients and 9101 controls. Odds ratios (ORs) and 95% confidence intervals (CIs) were calculated using multivariable logistic regression for case–control associations and polytomous logistic regression for histotype-specific associations, all adjusted for po tential confounders. In gen...
Source: European Journal of Epidemiology - Category: Epidemiology Source Type: research
AbstractSTUDY QUESTIONDo young women with early ovarian ageing (EOA), defined as unexplained, and repeatedly few oocytes harvested in ART have an increased risk of age-related events?SUMMARY ANSWERAt follow-up, women with idiopathic EOA had an increased risk of age-related events compared to women with normal ovarian ageing (NOA).WHAT IS KNOWN ALREADYEarly and premature menopause is associated with an increased risk of cardiovascular diseases (CVDs), osteoporosis and death. In young women, repeated harvest of few oocytes in well-stimulated ART cycles is a likely predictor of advanced menopausal age and may thus serve as an...
Source: Human Reproduction - Category: Reproduction Medicine Source Type: research
Abstract Ephrins are ligands of Eph receptors (Ephs); both of which are sorted into two classes, A and B. There are five types of ephrin-As (ephrin-A1-5) and three types of ephrin-Bs (ephrin-B1-3). Also, there are ten types of EphAs (EphA1-10) and six types of EphBs (EphB1-6). Binding of ephrins to the Eph receptors activates signaling cascades that regulate several biological processes such as cellular proliferation, differentiation, migration, angiogenesis and vascular remodeling. Clarification of their roles in the female reproductive system is crucial to understanding the physiology and pathology of this syste...
Source: Biology of Reproduction - Category: Reproduction Medicine Authors: Tags: Biol Reprod Source Type: research
AbstractAnti-M üllerian Hormone (AMH) is critical for physiologic involution of the Mullerian ducts during sexual differentiation in the male fetus. In women, AMH is a product of the small antral follicles in the ovaries and serves to function as an autocrine and paracrine regulator of follicular maturation. As t he size of the residual follicular pool depends on the quantity of small antral follicles and declines over time, the serum AMH level in women follows a characteristic trajectory: a gradual decline throughout the reproductive years and a precipitous drop at menopause, becoming undetectable soon afte r. Thus, ...
Source: The Journal of Obstetrics and Gynecology of India - Category: OBGYN Source Type: research
ConclusionsThis study confirms recent investigations demonstrating that conventional HKGs, such as GAPDH and beta-actin, are not suitable reference genes for specific pathological conditions, emphasizing the importance of determining the best HKGs on a case-by-case basis and according to tissue type. Our results have identified reliable HKGs for studies of normal human ovaries and those affected by OEA, OMA, OSPC, or PCOS, as well as combined studies of control subjects vs. each cancer or PCOS group.
Source: Journal of Assisted Reproduction and Genetics - Category: Reproduction Medicine Source Type: research
Conclusion: There was no difference in the ovarian protective effect according to the difference in the timing of administration of GnRHa. PMID: 32595989 [PubMed]
Source: Journal of Breast Cancer - Category: Cancer & Oncology Tags: J Breast Cancer Source Type: research
The objective of this review is to summarize our knowledge about the contribution of vitamin D3 to physiological and pathological processes within the ovary. PMID: 32469224 [PubMed - as supplied by publisher]
Source: Physiological Research - Category: Physiology Authors: Tags: Physiol Res Source Type: research
Polycystic ovary syndrome (PCOS) is a metabolic and hormonal disorder characterized by hyperandrogenism, oligoanovulation, and polycystic ovarian morphology. Women with PCOS are at a higher risk for health issues, ranging from endocrine conditions and reproductive comorbidities to cardiovascular complications. Regarding its effect on breast cancer, which is the most common female cancer, androgen excess has been postulated to play a part in carcinogenesis, especially in estrogen receptor (ER) –positive breast cancer.
Source: American Journal of Obstetrics and Gynecology - Category: OBGYN Authors: Tags: Research Letter Source Type: research
In this study, we found that Lnc-OC1 was significantly higher in PCOS granulosa cells (GCs) compared to non-PCOS GCs. Lnc-OC1 knockdown inhibited cell viability and promoted cell apoptosis, expression of aromatase mRNA and production of estradiol in KGN cells. In PCOS mice, Lnc-OC1 promoted the serum insulin release, production of angiogenesis-related factors and IκBα phosphorylation, which could be partially restored by Lnc-OC1 shRNA. These results suggest that Lnc-OC1 plays an important part in the pathogenesis of PCOS.
Source: Molecular and Cellular Endocrinology - Category: Endocrinology Source Type: research
Conclusions: Environmental toxin exposure in PCOS women could favour neoplastic transformation by exacerbating and potentiating some PCOS features. Further research, although difficult, is needed in order to prevent further diffusion of these substances in the environment, or at least to provide adequate information to the population considered at risk. PMID: 32046531 [PubMed - as supplied by publisher]
Source: Current Medical Research and Opinion - Category: Research Tags: Curr Med Res Opin Source Type: research
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