Molecular evolution of the deuterolysin (M35) family genes in Coccidioides.

Molecular evolution of the deuterolysin (M35) family genes in Coccidioides.
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球孢子菌中半溶素 (M35) 家族基因的分子进化

DOI:
10.1371/journal.pone.0031536
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发表时间:
2012
期刊:
影响因子:
3.7
通讯作者:
Zhang KQ
Zhang KQ
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Li J;Yu L;Tian Y;Zhang KQ

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球孢子菌属是人类的主要真菌病原体,在免疫功能低下的个体中引起称为球孢子菌病(山谷热)的威胁生命的呼吸道疾病。最近,Sharpton等人(2009)发现,在球孢子菌属和美国球孢子菌中,次级溶素(M35)家族基因显著扩增。reesii,球孢子菌属比U. reesii.在目前的工作中,系统发育分析的基础上,共28个M35家族基因,使用不同的路线和树的建设方法一致揭示了5个分支与高节点的支持。有趣的是,似然比检验表明,与球孢子菌属物种中的其他谱系相比,来自球孢子菌属物种的三个额外的重复M35家族基因的祖先谱系的选择压力存在显著差异,这可能与球孢子菌属物种中M35家族基因的新功能适应有关,例如,近期发病机制获得。我们的研究增加了对M35家族基因进化和功能的扩展观点,并为未来的实验研究奠定了理论基础。
Coccidioides is a primary fungal pathogen of humans, causing life-threatening respiratory disease known as coccidioidomycosis (Valley fever) in immunocompromised individuals. Recently, Sharpton et al (2009) found that the deuterolysin (M35) family genes were significantly expanded in both the Coccidioides genus and in U. reesii, and that Coccidioides has acquired three more M35 family genes than U. reesii. In the present work, phylogenetic analyses based on a total of 28 M35 family genes using different alignments and tree-building methods consistently revealed five clades with high nodal supports. Interestingly, likelihood ratio tests suggested significant differences in selective pressure on the ancestral lineage of three additional duplicated M35 family genes from Coccidioides species compared to the other lineages in the phylogeny, which may be associated with novel functional adaptations of M35 family genes in the Coccidioides species, e.g., recent pathogenesis acquisition. Our study adds to the expanding view of M35 family gene evolution and functions as well as establishes a theoretical foundation for future experimental investigations.
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