The relationship between allozyme and chromosomal polymorphism inferred from nucleotide variation at the Acph-1 gene region of Drosophila subobscura

被引:0
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作者
Navarro-Sabaté, A [1 ]
Aguadé, M [1 ]
Segarra, C [1 ]
机构
[1] Univ Barcelona, Fac Biol, Dept Genet, E-08071 Barcelona, Spain
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中图分类号
Q3 [遗传学];
学科分类号
071007 ; 090102 ;
摘要
The Acph-1 gene region was sequenced in 51 lines of Drosophila subobscura. Lines differ in their chromosomal arrangement for segment I of the O chromosome (O-st and O3+4) and in the Acph-1 electrophoretic allele (Acph-1(100), Acph-1(054), and Acph-1(>100)). The ACPH-1 protein exhibits much more variation than previously detected by electrophoresis. The amino acid replacements responsible for the Acph-1(054) and Acph-1(>100) electrophoretic variants are different within O-st and within O3+4, which invalidates all previous studies on linkage disequilibrium between chromosomal and allozyme polymorphisms at this locus. The Acph-1(>100) allele within O3+4 has a recent origin, while both Acph-1(054) alleles are rather old. Levels of nucleotide variation are higher within the O3+4 than within the O-st arrangement except for nonsynonymous sites. The McDonald and Kreitman test shows a significant excess of nonsynonymous polymorphisms within O-st when D. guanche is used as the outgroup. According to the nearly neutral model of molecular evolution, this excess is consistent with a smaller effective size of O-st relative to O3+4 arrangements. A smaller population size, a lower recombination, and a more recent bottleneck might be contributing to the smaller effective size of O-st.
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页码:871 / 889
页数:19
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