Variant antigen diversity in Trypanosoma vivax is not driven by recombination
Variant antigen diversity in Trypanosoma vivax is not driven by recombination
复制标题
间日锥虫的变异抗原多样性不是由重组驱动的
DOI:
10.1101/733998
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发表时间:
2019
期刊:
影响因子:
--
通讯作者:
Pereira S
中科院分区:
文献类型:
--
作者:
Pereira S
African trypanosomes (Trypanosoma) are vector-borne haemoparasites that survive in the vertebrate bloodstream through antigenic variation of their Variant Surface Glycoprotein (VSG). Recombination, or rather segmented gene conversion, is fundamental inTrypanosoma bruceifor bothVSGgene switching and for generating antigenic diversity during infections.Trypanosoma vivaxis a related, livestock pathogen whoseVSGlack structures that facilitate gene conversion inT. bruceiand mechanisms underlying its antigenic diversity are poorly understood. Here we show that species-wideVSGrepertoire is broadly conserved across diverseT. vivaxclinical strains and has limited antigenic repertoire. We use variant antigen profiling, coalescent approaches and experimental infections to show that recombination plays little role in diversifyingT. vivax VSGsequences. These results have immediate consequences for both the current mechanistic model of antigenic variation in African trypanosomes and species differences in virulence and transmission, requiring reconsideration of the wider epidemiology of animal African trypanosomiasis.
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