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Gene dosage effects on transmission ratio distortion and fertility in mice that carry t haplotypes

Published online by Cambridge University Press:  14 April 2009

Lee M. Silver
Lee M. Silver
Affiliation:
Department of Biology, Princeton University, Princeton, NJ 08544-1014
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Summary

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Complete t haplotypes can be transmitted at distorted ratios from heterozygous +/t male mice as a consequence of t-specific alleles at a series of t complex distorter loci (Tcd-1t through Tcd-4t) and a t complex responder locus. Partial t haplotypes that lack the Tcd-2t allele cannot be transmitted at the very high ratios characteristic of complete t haplotypes. The breeding studies reported here tested the possibility that the absence of Tcd-2t could be compensated for by the presence of double doses of other Tcdt alleles. The results indicate that a double dose of Tcd-4t alone will not work, but that a double dose of both Tcd-1t and Tcd-4t can promote a very high transmission ratio in the absence of Tcd-2t. These results suggest that the extent to which transmission ratios are distorted is dependent upon the absolute level of expression of the individual Tcd genes. Further studies of genotypic effects on transmission ratio distortion, as well as fertility, lead to the suggestion of a fifth t complex distorter (Tcd-5) locus within t haplotypes.

Type
Research Article
Information
Genetics Research , Volume 54 , Issue 3 , December 1989 , pp. 221 - 225
Copyright
Copyright © Cambridge University Press 1989

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