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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Microsatellite instability regulates transcription factor binding and gene expression
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Microsatellite instability regulates transcription factor binding and gene expression

机译:微卫星不稳定性调节转录因子结合和基因表达

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摘要

Microsatellites are tandemly repeated simple sequence DMA motifs widely prevalent in eukaryotic and prokaryotic genomes. In pathogenic bacteria, instability of these hypermutable loci through slipped-strand mispairing mediates the high-frequency reversible switching of phenotype expression, i.e., phase variation. Phase-variable expression of NadA, an outer membrane protein and adhesin of the pathogen Neisseria meningitidis, is mediated by changes in the number of TAAA repeats located upstream of the core promoter of nadA. Here we report that loss or gain of TAAA repeats affects the binding of the transcriptional regulatory protein IHF to the nadA promoter. Thus, phase-variable transcription of nadA potentially incorporates interplay between stochastic (mutational) and prescriptive (classical) mechanisms of gene regulation.
机译:微卫星是在真核和原核基因组中广泛流行的串联重复的简单序列DMA基序。在致病细菌中,这些高变位点通过滑链错配的不稳定性介导了表型表达的高频可逆转换,即相变。 NadA,脑膜炎奈瑟氏球菌的外膜蛋白和粘附素的相变表达是由位于nadA核心启动子上游的TAAA重复序列数量的变化介导的。在这里我们报告说,TAAA重复序列的丢失或获得会影响转录调节蛋白IHF与nadA启动子的结合。因此,nadA的相变转录可能会整合基因调控的随机(突变)和规定(经典)机制之间的相互作用。

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