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The genetic basis of adaptation: lessons from concealing coloration in pocket mice

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Abstract

Recent studies on the genetics of adaptive coat-color variation in pocket mice (Chaetodipus intermedius) are reviewed in the context of several on-going debates about the genetics of adaptation. Association mapping with candidate genes was used to identify mutations responsible for melanism in four different populations of C. intermedius. Here, I review four main results (i) a single gene, the melanocortin-1-receptor (Mc1r), appears to be responsible for most of the phenotypic variation in color in one population, the Pinacate site; (ii) four or fewer nucleotide changes at Mc1r appear to be responsible for the difference in receptor function; (iii) studies of migration-selection balance suggest that the selection coefficient associated with the dark Mc1r allele at the Pinacate site is large; and (iv) different (unknown) genes underlie the evolution of melanism on three other lava flows. These findings are discussed in light of the evolution of convergent phenotypes, the average size of phenotypic effects underlying adaptation, the evolution of dominance, and the distinction between adaptations caused by changes in gene dosage versus gene structure.

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  1. Department of Ecology and Evolutionary Biology, University of Arizona, Tucson, AZ, 85721, USA

    Michael W. Nachman

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Nachman, M.W. The genetic basis of adaptation: lessons from concealing coloration in pocket mice. Genetica 123, 125–136 (2005). https://doi.org/10.1007/s10709-004-2723-y

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