Molecular mechanisms underlying the control of antigenic variation in African trypanosomes.

Molecular mechanisms underlying the control of antigenic variation in African trypanosomes.
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DOI:
10.1016/j.mib.2010.08.009
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发表时间:
2010-12
影响因子:
5.4
通讯作者:
McCulloch, Richard
McCulloch, Richard
中科院分区:
生物学2区
文献类型:
--
作者:
Horn, David;McCulloch, Richard

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非洲锥虫通过转换其变异表面糖蛋白(VSG)的致密保护外壳来逃避宿主的适应性免疫反应。每个细胞每次仅从端粒表达位点(ES)表达一个VSG基因。在“前基因组”时代,人们在单端粒VSG转录的背景下确定了涉及VSG重组的一系列途径。基因组后早期时代的一个显著特征是对这些过程中所涉及的分子机制的描述。我们描述了近期与互斥转录和VSG重组相关的因子和序列,以及它们如何在抗原变异这一关键毒力机制的控制中起作用。
African trypanosomes escape the host adaptive immune response by switching their dense protective coat of Variant Surface Glycoprotein (VSG). Each cell expresses only one VSG gene at a time from a telomeric expression site (ES). The ‘pre-genomic’ era saw the identification of the range of pathways involving VSG recombination in the context of mono-telomeric VSG transcription. A prominent feature of the early post-genomic era is the description of the molecular machineries involved in these processes. We describe the factors and sequences recently linked to mutually exclusive transcription and VSG recombination, and how these act in the control of the key virulence mechanism of antigenic variation.
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