Abstract：
:The interaction between rapidly evolving centromere sequences and conserved kinetochore machinery appears to be mediated by centromere-binding proteins. A recent theory proposes that the independent evolution of centromere-binding proteins in isolated populations may be a universal cause of speciation among eukaryotes. In Drosophila the centromere-specific histone, Cid (centromere identifier), shows extensive sequence divergence between D. melanogaster and the D. simulans clade, indicating that centromere machinery incompatibilities may indeed be involved in reproductive isolation and speciation. However, it is presently unclear whether the adaptive evolution of Cid was a cause of the divergence between these species, or merely a product of postspeciation adaptation in the separate lineages. Furthermore, the extent to which divergent centromere identifier proteins provide a barrier to reproduction remains unknown. Interestingly, a small number of rescue lines from both D. melanogaster and D. simulans can restore hybrid fitness. Through comparisons of cid sequence between nonrescue and rescue strains, we show that cid is not involved in restoring hybrid viability or female fertility. Further, we demonstrate that divergent cid alleles are not sufficient to cause inviability or female sterility in hybrid crosses. Our data do not dispute the rapid divergence of cid or the coevolution of centromeric components in Drosophila; however, they do suggest that cid underwent adaptive evolution after D. melanogaster and D. simulans diverged and, consequently, is not a speciation gene.
journal_name
Heredity (Edinb)journal_title
Heredityauthors
Sainz A,Wilder JA,Wolf M,Hollocher Hdoi
10.1038/sj.hdy.6800275keywords:
subject
Has Abstractpub_date
2003-07-01 00:00:00pages
28-35issue
1eissn
0018-067Xissn
1365-2540pii
6800275journal_volume
91pub_type
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