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Genetics. Mar 2001; 157(3): 1293–1298.
PMCID: PMC1461554

Adaptive evolution of Cid, a centromere-specific histone in Drosophila.

Abstract

Centromeric DNA is generally composed of large blocks of tandem satellite repeats that change rapidly due to loss of old arrays and expansion of new repeat classes. This extreme heterogeneity of centromeric DNA is difficult to reconcile with the conservation of the eukaryotic chromosome segregation machinery. Histone H3-like proteins, including Cid in Drosophila melanogaster, are a unique chromatin component of centromeres. In comparisons between closely related species of Drosophila, we find an excess of replacement changes that have been fixed since the separation of D. melanogaster and D. simulans, suggesting adaptive evolution. The last adaptive changes appear to have occurred recently, as evident from a reduction in polymorphism in the melanogaster lineage. Adaptive evolution has occurred both in the long N-terminal tail as well as in the histone fold of Cid. In the histone fold, the replacement changes have occurred in the region proposed to mediate binding to DNA. We propose that this rapid evolution of Cid is driven by a response to the changing satellite repeats at centromeres. Thus, centromeric H3-like proteins may act as adaptors between evolutionarily labile centromeric DNA and the conserved kinetochore machinery.

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Selected References

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