Comparative analysis of evolutionary modes in Mc1r coat color gene in wild mice and mustelids

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概要

• 論文の詳細を見る

• Sequences from ten species of Mus (Rodentia, Muridae) of the melanocortin-1 receptor (Mc1r) gene (945 bp), which plays a key role in coat color determination, were compared with an existing Mc1r dataset (ca. 498 bp) from 12 species of Mustela and Martes (Carnivora, Mustelidae). The dN/dS ratio (ω) was estimated at 0.19 for Mus and 0.35 for the mustelids, using a likelihood-based one-ratio model with empirical codon frequencies. Running the model with equal codon frequencies gave a dramatic increase in ω for the mustelids (1.02) but not for Mus (0.31), indicating stronger codon usage bias in Mc1r among mustelids. When ω was estimated with the free-ratio model, significantly accelerated rates of amino acid replacement (nearly 1 in ω) were seen in several regions of the Mus phylogeny, such as in the ancestral subgeneric lineages, possibly associated with ecological niche shifting. Our results suggest that both functional constraints on coat color variation and selective constraints on codon usage bias have participated in structuring Mc1r gene sequences. Furthermore, they suggest that these contrasting influences have acted differentially in Mus and the mustelid lineages, and also differentially during the course of evolution within the genus Mus.

• 日本遺伝学会の論文
• 2009-06-25

著者

• 鈴木 仁

  北海道大学大学院地球環境科学研究院

• 鈴木 仁

  東京慈恵会医科大学

• 鈴木 仁

  北大院・地球環境

• 鈴木 仁

  北大・院地球環境

• Suzuki Hitoshi

  Division of Bioscience, Graduate School of Environmental Earth Science, Hokkaido University

• Suzuki H

  Laboratory Of Ecology And Genetics Graduate School Of Environmental Earth Science Hokkaido Universit

• SATO Jun

  Laboratory of Animal Cell Technology, Faculty of Life Science and Technology, Fukuyama University

• 鈴木 仁

  分子遺伝

• Aplin Ken

  Australian National Wildlife Collection Csiro Sustainable Ecosystems

• Sato Jun

  Laboratory Of Animal Cell Technology Faculty Of Life Science And Technology Fukuyama University

• SHIMADA Tomofumi

  Division of Bioscience, Graduate School of Environmental Earth Science, Hokkaido University

• Suzuki H

  Laboratory Of Ecology And Genetics Graduate School Of Environmental Earth Science Hokkaido Universit

• 鈴木 仁

  北海道大学

• Suzuki Hitoshi

  Division Of Bioscience Graduate School Of Environmental Earth Science Hokkaido University

• Suzuki Hitoshi

  Laboratory of Ecology and Genetics, Graduate School of Environmental Earth Science, Hokkaido University

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