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RFX1 maintains testis cord integrity by regulating the expression of Itga6 in male mouse embryos
Author(s) -
Wang Bo,
Qi Tao,
Chen ShiQin,
Ye Lei,
Huang ZhanSen,
Li Hao
Publication year - 2016
Publication title -
molecular reproduction and development
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.745
H-Index - 105
eISSN - 1098-2795
pISSN - 1040-452X
DOI - 10.1002/mrd.22660
Subject(s) - biology , sertoli cell , andrology , chromatin immunoprecipitation , spermatogenesis , microbiology and biotechnology , medicine , endocrinology , gene expression , genetics , promoter , gene
SUMMARY Formation and maintenance of testis cords during embryogenesis are essential for establishing testicular structure and function in adults. At least five genes ( Wt1 , Dhh , Sox8 / Sox9 , and Dax1 ) appear to be required for the maintenance of testis cord integrity in mice. Here, we report that RFX1 is specifically expressed in fetal Sertoli cells. Mouse embryos conditionally deficient in Rfx1 ( Rfx1 flox/flox , Amh ‐Cre) possessed disrupted testis cords, as the basal lamina lining was fragmented or completely absent in some areas of the testes. Spermatogenesis was blocked, leading to complete infertility. Expression of integrin alpha‐6 was significantly decreased in Rfx1 ‐deficient testes compared to control testes; indeed, luciferase and chromatin immunoprecipitation assays indicated that RFX1 directly activates transcription of Itga6 (the gene coding for integrin alpha‐6). Taken together, RFX1 transcriptionally targets Itga6 in Sertoli cells, thereby, helping maintain the integrity of the basal lamina during testis cord development. Mol. Reprod. Dev. 83: 606–614, 2016. © 2016 Wiley Periodicals, Inc .