Effects of spatially varying selection on nucleotide diversity and linkage disequilibrium: insights from deer mouse globin genes.

Genetics
Jay F Storz, John K Kelly

Abstract

An important goal of population genetics is to elucidate the effects of natural selection on patterns of DNA sequence variation. Here we report results of a study to assess the joint effects of selection, recombination, and gene flow in shaping patterns of nucleotide variation at genes involved in local adaptation. We first describe a new summary statistic, Z(g), that measures the between-sample component of linkage disequilibrium (LD). We then report results of a multilocus survey of nucleotide diversity and LD between high- and low-altitude populations of deer mice, Peromyscus maniculatus. The multilocus survey included two closely linked alpha-globin genes, HBA-T1 and HBA-T2, that underlie adaptation to different elevational zones. The primary goals were to assess whether the alpha-globin genes exhibit the hallmarks of spatially varying selection that are predicted by theory (i.e., sharply defined peaks in the between-population components of nucleotide diversity and LD) and to assess whether peaks in diversity and LD may be useful for identifying specific sites that distinguish selectively maintained alleles. Consistent with theoretical expectations, HBA-T1 and HBA-T2 were characterized by highly elevated levels of diversit...Continue Reading

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