Abstract
Steroidogenic factor I (SF-I), a transcriptional factor essential for estrogen biosynthesis, is undetectable in endometrial stromal cells and aberrantly expressed in endometriotic stromal cells. Objective: We tried to gain further insight into the mechanism for differential SF-I expression in endometrial and endometriotic stromal cells. Design: We had previously identified a novel CpG island in SF-I, which is located in the downstream intron I region. Here, we evaluated the methylation status of this CpG island. Patients: We obtained the eutopic endometrium from disease-free participants (n = 8) and the walls of cystic endometriosis lesions of the ovaries from another group of participants (n = 8). None of the patients had received any preoperative hormonal therapy. Interventions: Stromal cells were isolated from these 2 types of tissues and subjected to DNA bisulfite treatment and sequence analysis. Results: The SF-1 messenger RNA (mRNA) levels in endometriotic stromal cells were significantly higher than those in endometrial stromal cells. Bisulfite sequencing showed strikingly increased methylation of a l-kbp region around the previously identified CpG island in endometriotic cells compared with endometrial cells (P <.001). A strong correlation between SF-I mRNA levels and percentage methylation of the intron I region of the SF-I gene was observed in endometriotic cells (Spearman correlation coefficient,.96; P <.001). Conclusions: Methylation of the intron I region of the SF-I gene is associated with its expression in endometriotic cells. This CpG island therefore plays an important role in regulating SF-I expression.
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Xue, Q., Xu, Y., Yang, H. et al. Methylation of a Novel CpG Island of Intron I Is Associated With Steroidogenic Factor I Expression in Endometriotic Stromal Cells. Reprod. Sci. 21, 395–400 (2014). https://doi.org/10.1177/1933719113497283
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DOI: https://doi.org/10.1177/1933719113497283