Copy number variation and genetic diversity of MHC Class IIb alleles in an alien population of Xenopus laevis

Immunogenetics
Barbara K MableRichard C Tinsley

Abstract

Xenopus laevis (the African clawed frog), which originated through hybridisation and whole genome duplication, has been used as a model for genetics and development for many years, but surprisingly little is known about immune gene variation in natural populations. The purpose of this study was to use an isolated population of X. laevis that was introduced to Wales, UK in the past 50 years to investigate how variation at the MHC compares to that at other loci, following a severe population bottleneck. Among 18 individuals, we found nine alleles based on exon 2 sequences of the Class IIb region (which includes the peptide binding region). Individuals carried from one to three of the loci identified from previous laboratory studies. Genetic variation was an order of magnitude higher at the MHC compared with three single-copy nuclear genes, but all loci showed high levels of heterozygosity and nucleotide diversity and there was not an excess of homozygosity or decrease in diversity over time that would suggest extensive inbreeding in the introduced population. Tajima's D was positive for all loci, which is consistent with a bottleneck. Moreover, comparison with published sequences identified the source of the introduced population...Continue Reading

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Citations

Dec 7, 2016·Evolution; International Journal of Organic Evolution·Piotr MiniasPeter O Dunn

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Datasets Mentioned

BETA
EF535964
KP745469–77

Methods Mentioned

BETA
pregnancy tests
PCR

Software Mentioned

Arlequin
MEME
IFEL ( Likelihood )
DNAsp
HyPhy
ModelTest
SAS
BLAST
CodonTest
Sequencher

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