2009
DOI: 10.1111/j.1365-294x.2008.04057.x
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Long‐term survival of a urodele amphibian despite depleted major histocompatibility complex variation

Abstract: Depletion of polymorphism at major histocompatibility complex (MHC) genes has been hypothesized to limit the ability of populations to respond to emerging pathogens, thus putting their survival at risk. As pathogens contribute substantially to the global amphibian decline, assessing patterns of MHC variation is important in devising conservation strategies. Here, we directly compare levels of MHC class II and neutral variation between multiple populations of the great crested newt (Triturus cristatus) from ref… Show more

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Cited by 59 publications
(97 citation statements)
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References 69 publications
(145 reference statements)
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“…Our results imply that a mixture of drift and selection, but primarily drift, may explain MHC as well as microsatellite diversity patterns in Sussex frog populations. This is in accord with a similar comparison made with crested newts Triturus cristatus across Europe, in which both microsatellites and MHC loci showed 'southern richness' and 'northern purity' (Babik et al, 2009). The overall correlation of inter-site F ST estimates between microsatellites and MHC implied a role for drift, but the stronger differentiation at MHC loci compared with microsatellites in urban populations may reflect an element of selection.…”
Section: Discussionsupporting
confidence: 88%
“…Our results imply that a mixture of drift and selection, but primarily drift, may explain MHC as well as microsatellite diversity patterns in Sussex frog populations. This is in accord with a similar comparison made with crested newts Triturus cristatus across Europe, in which both microsatellites and MHC loci showed 'southern richness' and 'northern purity' (Babik et al, 2009). The overall correlation of inter-site F ST estimates between microsatellites and MHC implied a role for drift, but the stronger differentiation at MHC loci compared with microsatellites in urban populations may reflect an element of selection.…”
Section: Discussionsupporting
confidence: 88%
“…Though DRB genes usually display high diversity, in cases of small and isolated or bottlenecked populations, a lower variation is expected [52]. Similar results were found in other species such as northern elephant seals (Mirounga angustirostris) [53], great crested newt (Triturus cristatus) [54], and the black-footed rock-wallaby (Petrogale lateralis lateralis) [55]. Genetic drift is the reason for the reduced MHC variation in these populations because compared with balancing selection, which usually has a great influence on MHC genes, genetic drift becomes relatively stronger in small, isolated populations, leading to reduced variation at the MHC loci [56].…”
Section: Genetic Variation Of Drb In Golden Snub-nosed Monkeysupporting
confidence: 71%
“…First, three regions which encompassing putative ABS sites with a significantly positive (P<0.05) D value were identified in Tajima's D test across the exon 2 sequences (Figure 4), suggesting balancing selection exists on these regions [16,59]. Additionally, the sharing of MHC alleles among populations also indicates that MHC alleles may have been conserved by selection [54]. Second, random sites model analysis in PAML showed the existence of base selection in the maximum likelihood method.…”
Section: Balancing Selection and Recombinationmentioning
confidence: 97%
“…Although there are undoubtedly exceptions, these studies and others suggest that a high variability at MHC DRB coupled with low microsatellite diversity appears to be a relatively frequent occurrence in natural populations that are the subject of conservation concern because of small population size. Why this might be so has been the subject of considerable discussion and debate (Aguilar et al, 2004;van Oosterhout et al, 2006;Babik et al, 2009a).…”
Section: Patterns Of Mhc Diversitymentioning
confidence: 99%