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Sexually dimorphic sterility phenotypes in Hoxa10-deficient mice.

机译:Hoxa10缺陷小鼠中的性双态不育表型。

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摘要

The Abdominal B (AbdB) genes constitute a distinct subfamily of homeobox genes that exhibit posterior domains of expression, including the genital imaginal disc in Drosophila and the developing urogenital system in vertebrates. We have mutated the AbdB gene Hoxa10 in mice. We report here that homozygotes are fully viable and show an anterior homeotic transformation of lumbar vertebrae. All male homozygotes manifest bilateral cryptorchidism resulting in severe defects in spermatogenesis and increasing sterility with age. Female homozygotes ovulate normally, but about 80% are sterile because of death of embryos between days 2.5 and 3.5 post coitum. This coincides spatially and temporally with expression of maternal Hoxa10 in distal oviductal and uterine epithelium. These results indicate a role for AbdB Hox genes in male and female fertility and suggest that maternal Hoxa10 is required to regulate the expression of a factor that affects the viability of preimplantation embryos.
机译:腹部B(AbdB)基因构成了一个同源异型盒基因的独特亚家族,它们具有表达的后域,包括果蝇中的生殖器假想盘和脊椎动物中发育中的泌尿生殖系统。我们已经在小鼠中突变了AbdB基因Hoxa10。我们在这里报告纯合子是完全可行的,并且显示出腰椎的前同种异体转化。所有男性纯合子均表现出双侧隐睾症,导致精子发生严重缺陷并随着年龄的增长而增加不育性。雌性纯合子正常排卵,但由于在死后2.5至3.5天之间胚胎死亡,约80%是不育的。这在空间上和时间上与母体Hoxa10在输卵管远端和子宫上皮中的表达相吻合。这些结果表明AbdB Hox基因在雄性和雌性育性中的作用,并暗示母体Hoxa10需要调节影响植入前胚胎活力的因子的表达。

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