Ten-Eleven Translocation Genes are Downregulated in Endometriosis

Area of Science:

• Epigenetics
• Reproductive Biology
• Genomics

Background:

• Endometriosis is associated with dysregulation of ten-eleven translocation (TET) genes, which are crucial for DNA demethylation.
• TET genes convert 5-methylcytosine to 5-hydroxymethylcytosine (5-hmC), a key epigenetic modification.

Purpose of the Study:

• To validate TET gene expression in ectopic and eutopic endometrium.
• To assess TET gene expression in human endometrial stromal fibroblasts (HESF) during in vitro decidualization.
• To quantify 5-hmC levels in patients with endometriosis.

Main Methods:

• Collected blood, eutopic endometrium, and endometriotic tissues.
• Established HESF cultures from women with and without endometriosis (HESF-ENDO, HESF-CONTROL).
• Quantified global 5-hmC levels using ELISA and analyzed TET gene expression (TET1, TET2, TET3).

Main Results:

• TET gene expression was decreased in endometriosis tissues compared to controls.
• Ectopic endometrium showed higher global 5-hmC levels than eutopic endometrium.
• Blood DNA from women with endometriosis had significantly lower 5-hmC levels than controls.
• TET gene expression was reduced in non-decidualized HESF-ENDO; decidualization affected TET3 expression in HESF-CONTROL but not HESF-ENDO.

Conclusions:

• TET genes are downregulated in ectopic endometrium and HESF-ENDO, indicating their involvement in endometriosis.
• Elevated 5-hmC in endometriotic tissues suggests unique epigenetic alterations in endometriosis.
• These findings highlight a potential role for TET-mediated epigenetic regulation in the pathogenesis of endometriosis.