A tangled history: patterns of major histocompatibility complex evolution in the African mole-rats (family: Bathyergidae)

Kundu, S. and Faulkes, C. (2007) A tangled history: patterns of major histocompatibility complex evolution in the African mole-rats (family: Bathyergidae). Biological Journal Of The Linnean Society, 91 (3). pp. 493-503.

Full text not available from this repository.

Abstract

Phylogenetic trees based upon major histocompatibility complex (MHC) gene sequences, particularly those encompassing sites encoding the antigen recognition site, are often discordant with the species tree. It has been argued that the principal cause of such discordance is the presence of ancestrally derived polymorphisms persisting through speciation events as a consequence of selection. In the present study, we examine the evolution of the MHC class II DQα1 gene in an unusual family of hystricomorph rodents, the African mole-rats (Family: Bathyergidae). We show that there is a high level of trans-species polymorphism and that this is a result of positive selection. Furthermore, the major lineages of the gene tree are characterized by allelic motifs occurring in regions that coincide with the pocket domains of the putative antigen recognition site, a region that has been shown to be under positive selection in a number of MHC genes from a range of species. Finally, these alleles may have been retained for at least 48 million years. This is significantly older than the estimate for the equivalent primate locus and appears to be one of the oldest documented sets of MHC alleles. We suggest that these allelic motifs possess polymorphisms that have been immunologically important to African mole-rats over long periods of evolutionary history.

Item Type: Article
Subjects: Q Science > QH Natural history > QH0301 Biology (General) > QH0359 Evolution
Q Science > QH Natural history > QH0301 Biology (General) > QH0426 Genetics
Divisions: Faculty of Social and Applied Sciences > School of Human and Life Sciences
Depositing User: Samit Kundu
Date Deposited: 21 May 2015 16:10
Last Modified: 21 May 2015 16:10
URI: https://create.canterbury.ac.uk/id/eprint/13417

Actions (login required)

Update Item (CReaTE staff only) Update Item (CReaTE staff only)

Downloads

Downloads per month over past year

View more statistics

Share

Connect with us

Last edited: 29/06/2016 12:23:00