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Molecular Biology and Evolution, Vol 4, 473-482, Copyright © 1987 by Society for Molecular Biology and Evolution

ORIGINAL ARTICLE

Molecular evidence for the rapid propagation of mouse t haplotypes from a single, recent, ancestral chromosome

LM Silver, M Hammer, H Fox, J Garrels, M Bucan, B Herrmann, AM Frischauf, H Lehrach, H Winking and F Figueroa
Department of Molecular Biology, Princeton University, New Jersey 08544.

Mouse t haplotypes are variant forms of chromosome 17 that exist at high frequencies in worldwide populations of two species of commensal mice. To determine both the relationship of t haplotypes to each other and the species within which they exist, 35 representative t haplotypes were analyzed by means of 10 independent molecular probes, including five DNA clones and five polypeptide spots identified by means of two- dimensional gel electrophoresis. All of the tested haplotypes were found to share restriction fragments and polypeptide spots that are absent in mice carrying wild-type forms of chromosome 17. This observation provides the first direct evidence that all of the known t haplotypes are descendents of a single ancestral chromosome. The absence of variation among t haplotypes could mean that this ancestral chromosome existed relatively recently, in which case it would be necessary to postulate introgressions of t haplotypes across species lines to explain their presence in both Mus domesticus and M. musculus. Alternatively, it is possible that the ancestral chromosome existed prior to the split between M. domesticus and M. musculus and that, by chance, our probes fail to detect polymorphisms that exist among the t haplotypes. A further result of our analysis is the characterization of a partial t haplotype in a wild population of Israeli mice.
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[Abstract] [Full Text]


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