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Genetic markers of adaptive processes in the Far Eastern pink salmon Oncorhynchus gorbuscha: Allelic diversity at the locus of major histocompatibility complex MHC I-A1

  • Animal Genetics
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Abstract

To clarify allelic diversity at the locus of major histocompatibility complex MHC class I-A1 in the Far Eastern pink salmon Oncorhynchus gorbuscha, sequencing of the electrophoretic alleles isolated from the gel (DGGE alleles) was performed. In 47 individuals, the genotypes of which consisted of ten DGGE alleles, 18 MHC I-A1 nucleotide sequences were revealed, and thus, eight cryptic alleles not detected by electrophoresis were identified. Eleven of these alleles were identified earlier in pink salmon from Hokkaido, Alaska, and British Columbia, and seven, possibly, were unique to the populations from some Far Eastern regions. Six of the previously determined DGGE alleles corresponded to more than one nucleotide sequence. However, the sequences attributed to the same DGGE allele differed on average by less than 1 nucleotide. These findings point to sufficient sensitivity of the DGGE method, although the genetic diversity and differentiation estimates obtained with it will obviously be somewhat underestimated. Considerable predominance of nonsynonymous substitutions over the synonymous ones in the codons of the MHC I-A1 antigen-binding site confirms the presence of positive selection aimed at providing the population resistance to local spectrum of pathogens. Refinement of the allelic composition of the adaptively important MHC genetic marker will contribute to more complete understanding of the adaptive genetic structure of pink salmon as an important element of the overall population structure of the species.

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Authors and Affiliations

  1. Vavilov Institute of General Genetics, Russian Academy of Sciences, Moscow, 11999, Russia

    N. V. Gordeeva & E. A. Salmenkova

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  1. N. V. Gordeeva
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  2. E. A. Salmenkova
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Correspondence to N. V. Gordeeva.

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Original Russian Text © N.V. Gordeeva, E.A. Salmenkova, 2017, published in Genetika, 2017, Vol. 53, No. 11, pp. 1311–1319.

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Gordeeva, N.V., Salmenkova, E.A. Genetic markers of adaptive processes in the Far Eastern pink salmon Oncorhynchus gorbuscha: Allelic diversity at the locus of major histocompatibility complex MHC I-A1. Russ J Genet 53, 1234–1242 (2017). https://doi.org/10.1134/S1022795417110035

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