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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >The short-sequence designs of isochores from the human genome
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The short-sequence designs of isochores from the human genome

机译:人类基因组等位基因的短序列设计

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摘要

The human genome, a typical mammalian genome, is made up of long (≈1-Mb, on average) regions, the isochores, that are fairly homogeneous in base composition and belong in five families characterized by different GC levels. An analysis of di- and tri-nucleotide densities in the isochores from the five families has shown large differences. These different "short-sequence designs:" (ⅰ) account for the fraction-ation of human DNA (and vertebrate DNA in general) when using sequence-specific ligands in density gradients, (ⅱ) are very similar in whole isochores and in the corresponding intergenic sequences and introns, (ⅲ) are reflected in different codon usages, (ⅳ) lead to amino acid differences that increase the thermal stability of the proteins encoded by genes located in increasingly GC-rich isochore families, and (ⅴ) correspond to different chromatin structures.
机译:人类基因组是典型的哺乳动物基因组,由等长的长等位基因区组成(平均≈1-Mb),这些区的碱基组成相当均一,属于五个家族,具有不同的GC水平。对来自五个家族的等时线中的二核苷酸和三核苷酸密度的分析显示出很大的差异。当在密度梯度中使用序列特异性配体时,这些不同的“短序列设计”(when)解释了人类DNA(通常是脊椎动物DNA)的分级分离,(ⅱ)在整个等时线中和相应的基因间序列和内含子,(ⅲ)反映在不同的密码子用法中,(ⅳ)导致氨基酸差异,从而增加了位于越来越富含GC的等时线家族中的基因编码的蛋白质的热稳定性,(ⅴ)对应于不同的染色质结构。

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