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8 results for “DQB”
Borrelia infection in bank voles Myodes glareolus is associated with specific DQB haplotypes which affect allelic divergence within individuals
<p>The high polymorphism of Major Histocompatibility Complex (MHC) genes is generally considered to be a result of pathogen-mediated balancing selection. Such selection may operate in the form of heterozygote advantage, and/or through specific MHC allele–pathogen interactions. Specific MHC allele–pathogen interactions may promote polymorphism via negative frequency-dependent selection (NFDS), or selection that varies in time and/or space because of variability in the composition of the pathogen community (fluctuating selection; FS). In addition, divergent allele advantage (DAA) may act on top of these forms of balancing selection, explaining the high sequence divergence between MHC alleles. DAA has primarily been thought of as an extension of heterozygote advantage. However, DAA could also work in concert with NFDS though this is yet to be tested explicitly. To evaluate the importance of DAA in pathogen-mediated balancing selection, we surveyed allelic polymorphism of MHC class II DQB genes in wild bank voles (<i>Myodes glareolus</i>) and tested for associations between DQB haplotypes and infection by <i>Borrelia afzelii</i>, a tick-transmitted bacterium causing Lyme disease in humans. We found two significant associations between DQB haplotypes and infection status: one haplotype was associated with lower risk of infection (resistance), while another was associated with higher risk of infection (susceptibility). Interestingly, allelic divergence within individuals was higher for voles with the resistance haplotype compared to other voles. In contrast, allelic divergence was lower for voles with the susceptibility haplotype than other voles. The pattern of higher allelic divergence in individuals with the resistance haplotype is consistent with NFDS favouring divergent alleles in a natural population, hence selection where DAA works in concert with NFDS. </p>
Borrelia infection in bank voles Myodes glareolus is associated with specific DQB haplotypes which affect allelic divergence within individuals
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Data from: Evolution of the MHC-DQB exon 2 in marine and terrestrial mammals
On the basis of a general low polymorphism, several studies suggest that balancing selection in the class II major histocompatibility complex (MHC) is weaker in marine mammals as compared with terrestrial mammals. We investigated such differential selection among Cetacea, Artiodactyla, and Primates at exon 2 of MHC-DQB gene by contrasting indicators of molecular evolution such as occurrence of transpecific polymorphisms, patterns of phylogenetic branch lengths by codon position, rates of nonsynonymous and synonymous substitutions as well as accumulation of variable sites on the sampling of alleles. These indicators were compared between the DQB and the mitochondrial cytochrome b gene (cytb) as a reference of neutral expectations and differences between molecular clocks resulting from life history and historical demography. All indicators showed that the influence of balancing selection on the DQB is more variable and overall weaker for cetaceans. In our sampling, ziphiids, the sperm whale, monodontids and the finless porpoise formed a group with lower DQB polymorphism, while mysticetes exhibited a higher DQB variation similar to that of terrestrial mammals as well as higher occurrence of transpecific polymorphisms. Different dolphins appeared in the two groups. Larger variation of selection on the cetacean DQB could be related to greater stochasticity in their historical demography and thus, to a greater complexity of the general ecology and disease processes of these animals.
Data from: The influence of selection on MHC DQA and DQB haplotypes in the endemic New Zealand Hector's and Māui dolphins
Strong balancing selection on the Major Histocompatibility Complex (MHC) can lead to different patterns in gene frequencies and neutral genomic variation within species. We investigated diversity and geographic structure of MHC genes DQA and DQB, as well as their inferred functional haplotypes, from two regional populations (East and West Coast) of the endangered Hector's dolphin (Cephalorhynchus hectori hectori) and the critically endangered Māui dolphin (Cephalorhynchus hectori maui) (West Coast, North Island), and contrasted these results with patterns from neutral microsatellites. The Māui had the lowest number of alleles for DQA (2) and DQB (3), consistent with strong genetic drift acting on this remnant population. However, the two retained DQA alleles are amongst the most divergent combinations of all four alleles found across the Hector's metapopulation, potentially reflecting the retention of divergent alleles due to balancing selection. The high frequency of the divergent DQB04 allele also gave this population the highest nucleotide diversity for DQB. Strong differentiation was evident for DQA, DQB, and DQA-DQB haplotypes between the regional populations of Hector's dolphins (FST>0.213) and both subspecies (FST>0.311). Differentiation was generally greater than observed at neutral microsatellite loci, suggesting the influence of selection between geographically proximate East and West Coast populations. This might be the result of spatial differences in directional selection on those opposite coastlines. Additionally, measures of the ratio of non-synonymous to synonymous substitutions (dN/dS) were consistent with balancing selection over evolutionary time. Together, these results suggest a complex interplay of balancing selection, directional selection, local fidelity, and genetic drift.
Data from: The influence of selection on MHC DQA and DQB haplotypes in the endemic New Zealand Hector’s and Māui dolphins
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Data from: Evolution of the MHC-DQB exon 2 in marine and terrestrial mammals
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Data from: Diversity of MHC DQB and DRB genes in the endangered Australian sea lion (Neophoca cinerea)
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Data from: Genetic diversity and differentiation of the rhesus macaque (Macaca mulatta) population in western Sichuan, China, based on the second exon of the major histocompatibility complex class II DQB (MhcMamu-DQB1) alleles
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