Stage-specific expression of B cell translocation gene 1 in rat testis - PubMed (original) (raw)
Stage-specific expression of B cell translocation gene 1 in rat testis
D J Raburn et al. Endocrinology. 1995 Dec.
Abstract
B Cell translocation gene 1 (BTG1) is a member of a new family of putative antiproliferative factors. They are characterized by their rapid, but transient, expression in response to factors that induce growth arrest and subsequent differentiation. In immature rat Sertoli cell cultures, BTG1 messenger RNA (mRNA) increases rapidly after FSH stimulation. We obtained the full-length coding sequence of rat BTG1 complementary DNA for Northern blot analysis and in situ hybridization to determine the temporal expression and spatial distribution of BTG1 mRNA in the rat testis. Northern analysis of isolated adult germ cells and in situ hybridization analysis of adult seminiferous epithelium demonstrated that BTG1 expression was first evident in late primary spermatocytes. The level of BTG1 mRNA was also elevated in secondary spermatocytes, but was maximal in postmeiotic round spermatids where levels were 5 times the background. BTG1 mRNA was not detectable in cells in the M phase of meiosis or spermatids undergoing nuclear elongation and condensation. The oscillation of BTG1 expression from the late prophase of the first meiotic division through spermatozoa release suggests BTG1 involvement in spermatogenesis. High levels of BTG1 mRNA at entry into terminal spermatid differentiation suggests a role consistent with that proposed for the BTG1 family of antiproliferative factors.
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