Mutation and recombination in cattle satellite DNA: a feedback model for the evolution of satellite DNA repeats

Journal of Molecular Evolution
I J Nijman, J A Lenstra

Abstract

The cattle genome contains several distinct centromeric satellites with interrelated evolutionary histories. We compared these satellites in Bovini species that diverged 0.2 to about 5 Myr ago. Quantification of hybridization signals by phosphor imaging revealed a large variation in the relative amounts of the major satellites. In the genome of water buffalo this has led to the complete deletion of satellite III. Comparative sequencing and PCR-RFLP analysis of satellites IV, 1.711a, and 1.711b from the related Bos and Bison species revealed heterogeneities in 0.5 to 2% of the positions, again with variations in the relative amounts of sequence variants. Restriction patterns generated by double digestions suggested a recombination of sequence variants. Our results are compatible with a model of the life history of satellites during which homogeneity of interacting repeat units is both cause and consequence of the rapid turnover of satellite DNA. Initially, a positive feedback loop leads to a rapid saltatory amplification of homogeneous repeat units. In the second phase, mutations inhibit the interaction of repeat units and coexisting sequence variants amplify independently. Homogenization by the spreading of one of the variants ...Continue Reading

Citations

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