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J Biol Chem. 2010 Nov 5;285(45):34469-76. doi: 10.1074/jbc.M110.157552. Epub 2010 Aug 27.

Heat shock transcription factor 1 localizes to sex chromatin during meiotic repression.

Author information

1
Department of Biosciences, Åbo Akademi University, FI-20521 Turku, Finland.

Abstract

Heat shock factor 1 (HSF1) is an important transcription factor in cellular stress responses, cancer, aging, and developmental processes including gametogenesis. Disruption of Hsf1, together with another HSF family member, Hsf2, causes male sterility and complete lack of mature sperm in mice, but the specific role of HSF1 in spermatogenesis has remained unclear. Here, we show that HSF1 is transiently expressed in meiotic spermatocytes and haploid round spermatids in mouse testis. The Hsf1(-/-) male mice displayed regions of seminiferous tubules containing only spermatogonia and increased morphological abnormalities in sperm heads. In search for HSF1 target genes, we identified 742 putative promoters in mouse testis. Among them, the sex chromosomal multicopy genes that are expressed in postmeiotic cells were occupied by HSF1. Given that the sex chromatin mostly is repressed during and after meiosis, it is remarkable that HSF1 directly regulates the transcription of sex-linked multicopy genes during postmeiotic repression. In addition, our results show that HSF1 localizes to the sex body prior to the meiotic divisions and to the sex chromocenter after completed meiosis. To the best of our knowledge, HSF1 is the first known transcription factor found at the repressed sex chromatin during meiosis.

PMID:
20802198
PMCID:
PMC2966061
DOI:
10.1074/jbc.M110.157552
[Indexed for MEDLINE]
Free PMC Article

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