Hickey D A, Bally-Cuif L, Abukashawa S, Payant V, Benkel B F
Department of Biology, University of Ottawa, ONT, Canada.
Proc Natl Acad Sci U S A. 1991 Mar 1;88(5):1611-5. doi: 10.1073/pnas.88.5.1611.
Very rapid rates of gene conversion were observed between duplicated alpha-amylase-coding sequences in Drosophila melanogaster. This gene conversion process was also seen in the related species Drosophila erecta. Specifically, there is virtual sequence identity between the coding regions of the two genes within each species, while the sequence divergence between species is close to that expected based on their phylogenetic relationship. The flanking, noncoding regions are much more highly diverged and do not appear to be subject to gene conversion. Comparison of amylase sequences between the two species provides a clear demonstration that recurrent gene conversion does indeed lead to the concerted evolution of the gene pair.
在黑腹果蝇中,观察到重复的α-淀粉酶编码序列之间存在非常快速的基因转换率。在相关物种 erecta 果蝇中也发现了这种基因转换过程。具体而言,每个物种内两个基因的编码区域之间几乎存在序列同一性,而物种之间的序列差异接近基于它们的系统发育关系所预期的差异。侧翼的非编码区域差异要大得多,似乎不受基因转换的影响。两个物种之间淀粉酶序列的比较清楚地表明,反复的基因转换确实导致了这对基因的协同进化。