The evolutionary history of the two karyotypic groups of the common shrew, Sorex araneus, in Poland

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Abstract

Genetic variability within and among two karyotypic groups and five chromosome races of the common shrew (Sorex araneus) in Poland was assayed by sequencing a 1023 bp part of the cytochrome b gene (mtDNA) from 28 individuals. Thirty-four variable positions defined 21 distinct haplotypes with a maximum sequence divergence of 0.88%. No significant differentiation in the cytochrome b gene between Western and Eastern Karyotypic groups was found. Haplotype diversity estimates within the races and groups sampled were high (h = 0.800-0.928), while nucleotide diversity estimates were low (π = 0.0034-0.0053). The distribution of pairwise nucleotide differences fits well with expectations of a 'sudden expansion' model. High haplotype diversity was accompanied by relatively high expected heterozygosity (HE) values in nuclear genes (calculated over 47 enzyme loci: HE = 0.031 - 0.049), giving no evidence for a recent bottleneck after the process of post-Pleistocene recolonization of Poland by the shrews. Thus, for S. araneus chromosome races in Poland, the data on the cytochrome b gene variability support the hypothesis assuming the Robertsonian fusions having spread into an ancestral acrocentric distribution.

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Ratkiewicz, M., Fedyk, S., Banaszek, A., Gielly, L., Chętnicki, W., Jadwiszczak, K., & Taberlet, P. (2002). The evolutionary history of the two karyotypic groups of the common shrew, Sorex araneus, in Poland. Heredity, 88(4), 235–242. https://doi.org/10.1038/sj.hdy.6800032

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