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Journal of Assisted Reproduction and Genetics

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11.05.2016 | Epigenetics

Epigenetic alterations of CYP19A1 gene in Cumulus cells and its relevance to infertility in endometriosis

verfasst von: Elham Hosseini, Fereshteh Mehraein, Maryam Shahhoseini, Leili Karimian, Fatemeh Nikmard, Mahnaz Ashrafi, Parvaneh Afsharian, Reza Aflatoonian

Erschienen in: Journal of Assisted Reproduction and Genetics | Ausgabe 8/2016

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Abstract

Purpose

The purpose of the present study was to investigate the epigenetic mechanisms responsible for the aberrant aromatase expression (CYP19A1) in Cumulus Cells (CCs) of infertile endometriosis patients.

Method

Cumulus cells were obtained from 24 infertile patients with and without endometriosis who underwent ovarian stimulation for intracytoplasmic sperm injection. Expression of CYP19A1 gene was quantified using Reverse Transcription Q-PCR. DNA methylation, histone modifications, and binding of Estrogen Receptor, ERβ to regulatory DNA sequences of CYP19A1 gene were evaluated by Chromatin ImmunoPrecipitation (ChIP) assay.

Results

CYP19A1 gene expression in CCs of endometriosis patients was significantly lower than the control group (P = 0.04). Higher incorporation of MeCP2 (as a marker of DNA methylation) on PII and PI.4 promoters, and hypoacetylation at H3K9 in PII and hypermethylation at H3K9 in PI.4 were observed in CYP19A1 gene in endometriosis patients (P < 0.05). Moreover, a decreased level of ERβ binding to PII and an increased level of its binding to PI.3 and PI.4 promoters of CYP19A1 were observed in endometriosis patients when compared to control.

Conclusion

Significant reduction of CYP19A1 gene expression in CCs of endometriosis patients may be the result of epigenetic alterations in its regulatory regions, either by DNA methylation or histone modifications. These epigenetic changes along with differential binding of ERβ (as a transcription factor) in CYP19A1 promoters may impair follicular steroidogenesis, leading to poor Oocyte and embryo condition in endometriosis patients.

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Titel: Epigenetic alterations of CYP19A1 gene in Cumulus cells and its relevance to infertility in endometriosis
verfasst von: Elham Hosseini
Fereshteh Mehraein
Maryam Shahhoseini
Leili Karimian
Fatemeh Nikmard
Mahnaz Ashrafi
Parvaneh Afsharian
Reza Aflatoonian
Publikationsdatum: 11.05.2016
Verlag: Springer US
Erschienen in: Journal of Assisted Reproduction and Genetics / Ausgabe 8/2016
Print ISSN: 1058-0468
Elektronische ISSN: 1573-7330
DOI: https://doi.org/10.1007/s10815-016-0727-z

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Epigenetic alterations of CYP19A1 gene in Cumulus cells and its relevance to infertility in endometriosis