The simple repeat poly(dT-dG).poly(dC-dA) common to eukaryotes is absent from eubacteria and archaebacteria and rare in protozoans.
The simple repeat poly(dT-dG).poly(dC-dA) common to eukaryotes is absent from eubacteria and archaebacteria and rare in protozoans.
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真核生物常见的简单重复聚(dT-dG).聚(dC-dA)在真细菌和古细菌中不存在,在原生动物中也很少见。
DOI:
10.1093/oxfordjournals.molbev.a040399
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发表时间:
1986
影响因子:
10.7
通讯作者:
Ivarie,R
中科院分区:
文献类型:
--
作者:
Morris,J;Kushner,SR;Ivarie,R
Genomic DNA from a wide variety of prokaryotic and eukaryotic organisms has been assayed for the simple repeat sequence poly(dT-dG).poly(dC-dA) by Southern blotting and DNA slot blot hybridizations. Consistent with findings of others, we have found the simple alternating sequence to be present in multiple copies in all organisms in the animal kingdom (e.g., mammals, reptiles, amphibians, fish, crustaceans, insects, jellyfish, nematodes). The TG element was also found in lower eukaryotes (Saccharomyces cerevisiae, Neurospora crassa, and Dictyostelium discoideum) and at a much lower frequency in protozoans (Oxytricha fallux and Tetrahymena thermophila). The sequence was also repeated in high copy number in a higher plant (Zea mays) as well as at very high levels in a unicellular green alga (Chlamydomonas reinhardi). Although the copy number of the repeat per haploid genome was generally proportional to genome size, there was a greater-than-1,000-fold variation in the number of (TG)25/100-kb genomic DNA. By contrast, no eu-or archaebacterium--including Myxococcus xanthus, whose life cycle is very similar to that of the slime mold Dictyostelium discoideum, and Halobacter volcanii, whose genome contains other repeated sequences--was found whose genomic DNA contained this sequence in detectable amounts. A computer search also failed to find the TG element in human mitochondrial DNA.
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影响因子:
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作者:
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