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Biology of Reproduction, Vol 31, 595-603, Copyright © 1984 by Society for the Study of Reproduction

ARTICLES

Genetic and morphometric studies of the heterogeneity in the testicular defect of the Hre rat and the interaction between the Hre and grc genes

TJ Gill 4th, TJ Gill 3d, HW Kunz, NA Musto and CW Bardin

This study was undertaken to examine further the behavior of the Hre gene and its interaction with the growth and reproduction complex genes (grc) in the (Hre x BN)F2, Hre x (Hre x BN)F1 and (BIL/1 x Hre) F2 crosses. The blaze characteristic of rats carrying the Hre gene was linked to testicular weight but not to the body weight or to the major histocompatibility complex (MHC). The Hre defect was genetically unrelated to the testicular defect caused by the grc. The Hre gene had a variable effect on the testes of the rats in different crosses, and it could be categorized into three distinct stages of progressively greater severity. In the cross in which the parents carried the Hre/+ and grc/grc genes, respectively, there was a decreased litter size, an increased male:female ratio in the offspring and poor reproductive performance when compared to a similar cross in which the Hre/+ gene alone was segregating. There was, however, no effect on the severity of the testicular defect. Thus, the grc can interact with the Hre gene to cause embryonic death, which appears to be selective for females, but not to influence the severity of the testicular defect.




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Copyright © 1984 by the Society for the Study of Reproduction.