期刊
GENESIS
卷 34, 期 4, 页码 257-266出版社
WILEY
DOI: 10.1002/gene.10163
关键词
X inactivation; meiosis; testis; gene regulation
资金
- NCI NIH HHS [CA84198] Funding Source: Medline
- NICHD NIH HHS [HD23126, HD36512] Funding Source: Medline
Transcriptional inactivation of the single X chromosome occurs in spermatogenic cells during male meiosis in mammals and has been shown to be coincident with expression of the Xist gene in spermatogonia and spermatocytes in mice. However, male mice carrying an ablated Xist gene show normal fertility. Here we examined expression from the Xist locus during spermatogenesis in wild-type mice and detected sense (Kist), but not antisense (Tsix) transcripts. In addition, we examined expression and chromatin conformation of X-linked structural genes in meiotic and postmeiotic spermatogenic cells from wildtype and Xist- mice and found no differences associated with the absence of a functional Xist gene. These results, along with the formation of a morphologically normal XY body in primary spermatocytes in Xist(-) mice, indicate that a functional Xist gene is not required for X-chromosome inactivation during spermatogenesis and that this process is therefore regulated by a different mechanism than that which regulates X-chromosome inactivation in female embryonic cells. (C) 2002 Wiley-Liss, Inc.
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