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Molecular Biology and Evolution, Vol 9, 14-26, Copyright © 1992 by Society for Molecular Biology and Evolution

ORIGINAL ARTICLE

Exon-specific gene correction (conversion) during short evolutionary periods: homogenization in a two-gene family encoding the beta-chain constant region of the T-lymphocyte antigen receptor

S Rudikoff, WM Fitch and M Heller
Laboratory of Genetics, National Cancer Institute, National Institutes of Health, Bethesda, Maryland 20892.

The two genes encoding the beta-chain constant region of the T- lymphocyte antigen receptor appear to have undergone gene conversion in a number of species, including wild and laboratory mice. To examine the frequency of such events during short evolutionary periods, we have characterized the corresponding genes from an African pygmy mouse, Mus minutoides. Sequence analysis indicates that exon 1 regions from these genes have undergone conversion events independent of those observed in other mouse species. Furthermore, the conversion events in all murine species are limited to exon 1 sequences. One such event involves the insertion and subsequent transfer of an entire codon between the two genes. Comparisons with other murine C beta sequences suggest that gene conversion has occurred on the order of every 0.3 Myr during the evolution of a family consisting of only two genes.
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