Variant antigen diversity in Trypanosoma vivax is not driven by recombination

Variant antigen diversity in Trypanosoma vivax is not driven by recombination
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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
Pereira S
中科院分区:
--
文献类型:
--
作者:
Pereira S

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非洲锥虫(锥虫)是媒介传播的血液寄生虫,通过其变异表面糖蛋白(VSG)的抗原变异在脊椎动物血流中存活。在布氏锥虫中,VSG基因的转换,或者更确切地说是分段基因的转换,对于VSG基因的转换和在感染过程中产生抗原多样性都是至关重要的。在这里,我们表明,物种广泛的VSGrepertoire是广泛保守的diverseT。vivaxclinical菌株,并具有有限的抗原库。我们使用变异抗原分析、合并方法和实验感染来证明重组在T细胞多样化中起的作用很小。间日疟原虫VSG序列。这些结果对目前非洲锥虫抗原变异的机制模型和毒力和传播的物种差异产生直接影响,需要重新考虑动物非洲锥虫的更广泛流行病学。
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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