Abstract
THE Abdominal B (AbdB) genes constitute a distinct subfamily of homeobox genes that exhibit posterior domains of expression1,2, including the genital imaginal disc in Drosophila and the develop-ing urogenital system in vertebrates3,4. We have mutated the AbdB gene Hoxal0 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 steril-ity 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 Hoxal0 in distal oviductal and uterine epithelium. These results indicate a role for AbdB Hox genes in male and female fertility and suggest that maternal Hoxal0 is required to regulate the expression of a factor that affects the viability of preimplantation embryos.
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Satokata, I., Benson, G. & Maas, R. Sexually dimorphic sterility phenotypes in HoxalO-deficient mice. Nature 374, 460–463 (1995). https://doi.org/10.1038/374460a0
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DOI: https://doi.org/10.1038/374460a0
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