Positive selection and interallelic recombination at the merozoite surface antigen-1 (MSA-1) locus of Plasmodium falciparum.

Positive selection and interallelic recombination at the merozoite surface antigen-1 (MSA-1) locus of Plasmodium falciparum.
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恶性疟原虫裂殖子表面抗原 1 (MSA-1) 基因座的正选择和等位基因间重组。

DOI:
10.1093/oxfordjournals.molbev.a040730
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发表时间:
1992
影响因子:
10.7
通讯作者:
A. Hughes
A. Hughes
中科院分区:
生物学1区
文献类型:
--
作者:
A. Hughes

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恶性疟原虫裂殖子表面抗原-1(MSA-1)基因座等位基因的DNA序列显示了等位基因之间重复重组事件的证据。这些包括(1)使等位基因之间的某些基因区域均质化的非相互重组事件和(2)使具有不同进化历史的等位基因片段组合从而增强等位基因多样性的相互重组事件。在三个不同的基因区域,非同义核苷酸取代的速率显着超过同义核苷酸取代,这意味着积极的达尔文选择已经采取行动,多样化的等位基因在氨基酸水平上。MSA-1多态性似乎是相当古老的;两种主要的等位基因类型已经保持了大约3500万年。
DNA sequences of alleles at the merozoite surface antigen-1 (MSA-1) gene locus of the malaria parasite Plasmodium falciparum show evidence of repeated past recombination events between alleles. These include both (1) nonreciprocal recombination events that have homogenized certain gene regions among alleles and (2) reciprocal recombination events that have combined allelic segments with divergent evolutionary histories, thereby enhancing allelic diversity. In three different gene regions, the rate of nonsynonymous nucleotide substitution significantly exceeds that of synonymous nucleotide substitution, implying that positive Darwinian selection has acted to diversify alleles at the amino acid level. The MSA-1 polymorphism seems to be quite ancient; the two major allelic types have been maintained for approximately 35 Myr.
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