Molecular characterization of major histocompatibility complex class II alleles in the common frog, Rana temporaria

Zeisset, I and Beebee, T J C (2009) Molecular characterization of major histocompatibility complex class II alleles in the common frog, Rana temporaria. Molecular Ecology Resources, 9 (3). pp. 738-745. ISSN 1755-098X

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Abstract

Major histocompatibility complex (MHC) class II genes, which play a major role in the immune system response, are some of the most polymorphic genes in vertebrates. We developed polymerase chain reaction primers for part of the second exon of an expressed MHC class II gene in the common frog, Rana temporaria. We genotyped this locus in five frog populations in southeast England and detected eight alleles in 215 individuals. Five or six alleles were detected in each population with a maximum of two alleles per individual, indicating that only a single locus was amplified. We also inferred the possible existence of a null allele. There were 23 variable nucleotide sites (out of 136) and 13 variable amino acid sites (out of 44), many of which corresponded to amino acids involved in antigen recognition. We detected a significant excess of nonsynonymous substitutions at antigen binding sites, indicating that this gene is under positive selection. The level of variation we found was similar to that in other amphibian MHC class II loci, such as those in Bombina bombina, Xenopus laevis and Ambystoma tigrinum.

Item Type: Article
Schools and Departments: School of Life Sciences > Evolution, Behaviour and Environment
Depositing User: Inga Zeisset
Date Deposited: 06 Feb 2012 18:14
Last Modified: 20 Mar 2012 09:42
URI: http://sro.sussex.ac.uk/id/eprint/15351
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