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卫星DNA图谱的变异——原因及影响。

Variation in satellite DNA profiles--causes and effects.

作者信息

Ugarković Durdica, Plohl Miroslav

机构信息

Department of Molecular Genetics, Ruder Boskoviać Institute, Bijenicka 54, HR-10002 Zagreb, Croatia.

出版信息

EMBO J. 2002 Nov 15;21(22):5955-9. doi: 10.1093/emboj/cdf612.

Abstract

Heterochromatic regions of the eukaryotic genome harbour DNA sequences that are repeated many times in tandem, collectively known as satellite DNAs. Different satellite sequences co-exist in the genome, thus forming a set called a satellite DNA library. Within a library, satellite DNAs represent independent evolutionary units. Their evolution can be explained as a result of change in two parameters: copy number and nucleotide sequence, both of them ruled by the same mechanisms of concerted evolution. Individual change in either of these two parameters as well as their simultaneous evolution can lead to the genesis of species-specific satellite profiles. In some cases, changes in satellite DNA profiles can be correlated with chromosomal evolution and could possibly influence the evolution of species.

摘要

真核生物基因组的异染色质区域含有串联重复多次的DNA序列,统称为卫星DNA。不同的卫星序列共存于基因组中,从而形成一个称为卫星DNA文库的集合。在一个文库中,卫星DNA代表独立的进化单元。它们的进化可以解释为两个参数变化的结果:拷贝数和核苷酸序列,这两个参数均受协同进化的相同机制支配。这两个参数中任何一个的个体变化以及它们的同时进化都可能导致物种特异性卫星图谱的产生。在某些情况下,卫星DNA图谱的变化可能与染色体进化相关,并可能影响物种的进化。

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