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Hypermethylation of the CpG Island Spanning From Exon II to Intron III is Associated With Steroidogenic Factor 1 Expression in Stromal Cells of Endometriosis

Abstract

Endometriosis is an estrogen-dependent disease. Steroidogenic factor 1 (SF-1), a transcription factor, is essential for the activation of multiple steroidogenic genes for estrogen biosynthesis in endometriosis-derived stromal cells.

Objective

Unravel the mechanism for differential SF-1 expression in endometrial and endometriotic stromal cells. DESIGN: We identified a novel CpG island in the SF-1 gene, which spans from exon II to intron III. We evaluated the methylation status of this CpG island. PATIENTS: Eutopic endometrium from disease-free participants (n = 8) and the walls of cystic endometriosis lesions of the ovaries (n = 8). None of the patients had received any preoperative hormonal therapy. Stromal cells were isolated from these 2 types of tissues.

Results

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 in endometriotic cells compared with endometrial cells (P < .001). A strong correlation between mRNA levels and percentage methylation of the exon II/intron III are observed. Specifically, the Pearson correlation coefficient was .98 (P < .001) for this association.

Conclusions

We demonstrated that methylation of a coding exon/intron sequence in the SF-1 gene positively regulated its expression in endometriosis, whereas its hypomethylation in normal endometrium was associated with drastically lower SF-1 levels.

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Correspondence to Serdar E. Bulun MD.

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Xue, Q., Zhou, Y.F., Zhu, S.N. et al. Hypermethylation of the CpG Island Spanning From Exon II to Intron III is Associated With Steroidogenic Factor 1 Expression in Stromal Cells of Endometriosis. Reprod. Sci. 18, 1080–1084 (2011). https://doi.org/10.1177/1933719111404614

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Keywords

  • SF-1
  • endometriosis
  • DNA methylation
  • intron
  • CpG island