Major Histocompatibility Complex Class II Genes Allele Diversity in Landlocked Seals.

Autor:	Meschersky IG; A.N. Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, Moscow., Meschersky SI; A.N. Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, Moscow., Kryukova NV; A.N. Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, Moscow., Solovyeva MA; A.N. Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, Moscow., Boltnev EA; Russian Federal Research Institute of Fisheries and Oceanography, Moscow., Klimov FV; 'Kazakhstan Agency of Applied Ecology' LLP., Rozhnov VV; A.N. Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, Moscow.
Jazyk:	angličtina
Zdroj:	The Journal of heredity [J Hered] 2024 Nov 02. Date of Electronic Publication: 2024 Nov 02.
DOI:	10.1093/jhered/esae064
Abstrakt:	The allelic diversity of exon 2 (DQB gene) and exon 3 (DRB gene) of major histocompatibility complex class II was studied for the first time in two species of the landlocked pinnipeds, Baikal (N = 79) and Caspian (N = 32) seals, and these were in compared with the widespread Arctic species, the ringed seal (N = 13). The analysis of the second exon comprising the antigen-binding region revealed high allelic diversity in all three species but the pattern of the diversity was the most specific for the Baikal seal. This species differs from the other two by the smallest number of alleles in the population, yet they have the largest number of alleles per individual and by the maximum similarity of individual genotypes. Presumably, this specificity is a consequence of the spatial and temporal homogeneity of the Lake Baikal environment. Analysis of the third exon encoding the conserved β2-domain showed that the Baikal seal differs by the greatest number of amino acid sequences per individual, while the Caspian seal has the lowest number of variants. A single variant of the β2-domain, the same as in the ringed seal, predominates in the Caspian seal, whereas in the Baikal seal the two other variants predominate. At the same time, three species-specific amino acid sequences were observed among minor variants in the Caspian seal, while only one was found in the Baikal seal. This fact may suggest a longer period of independent evolution in the Caspian seal compared to the Baikal seal. (© The Author(s) 2024. Published by Oxford University Press on behalf of The American Genetic Association. All rights reserved. For commercial re-use, please contact reprints@oup.com for reprints and translation rights for reprints. All other permissions can be obtained through our RightsLink service via the Permissions link on the article page on our site—for further information please contact journals.permissions@oup.com.)
Databáze:	MEDLINE
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