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图氏摇蚊核糖体DNA中的间隔区大小异质性是由于一个与主要位于着丝粒的重复序列同源的120 bp重复序列所致。

Spacer size heterogeneity in ribosomal DNA of Chironomus thummi is due to a 120 bp repeat homologous to a predominantly centromeric repeated sequence.

作者信息

Israelewski N, Schmidt E R

出版信息

Nucleic Acids Res. 1982 Dec 11;10(23):7689-700. doi: 10.1093/nar/10.23.7689.

DOI:10.1093/nar/10.23.7689
PMID:6296786
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC327039/
Abstract

The rDNA of Ch. tepperi is homogeneous in structure with a repeat size of 8.4 kb. This size seems to be typical for the basic repeat unit in Chironomus species. Ch. th. piger rDNA cistrons are slightly increased in length (9.0 kb). In the non-transcribed spacer (NTS) an appr. 0.18 kb segment is additionally present in about 50% of the repeats. Ch. th. thumni DNA contains largely heterogeneous rDNA repeats, mainly between 10 and 16 kb. The heterogeneity is due to varying numbers of 120 bp elements present in the NTS. The different spacer size classes are not randomly distributed. The short repetitive 120 bp elements (Cla I elements) hybridize in situ with the nucleolus and with centromere regions. The Cla I elements are regularly present in the thummi NTS, but are absent in the piger NTS. Only very few piger rDNA cistrons may contain Cla I elements.

摘要

特氏摇蚊的核糖体DNA（rDNA）结构均匀，重复单元大小为8.4 kb。这个大小似乎是摇蚊属物种基本重复单元的典型特征。嗜尸摇蚊的rDNA顺反子长度略有增加（9.0 kb）。在非转录间隔区（NTS），约50%的重复序列中额外存在一个约0.18 kb的片段。嗜人摇蚊的DNA包含大量异质性rDNA重复序列，主要在10至16 kb之间。这种异质性是由于NTS中存在不同数量的120 bp元件。不同的间隔区大小类别并非随机分布。短的重复性120 bp元件（Cla I元件）在原位与核仁及着丝粒区域杂交。Cla I元件在嗜人摇蚊的NTS中经常出现，但在嗜尸摇蚊的NTS中不存在。只有极少数嗜尸摇蚊的rDNA顺反子可能含有Cla I元件。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6610/327039/95395c6efcb5/nar00392-0239-a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6610/327039/c8fda569c1fc/nar00392-0235-a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6610/327039/c5a6b665addc/nar00392-0237-a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6610/327039/fbbd79aeade4/nar00392-0238-a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6610/327039/95395c6efcb5/nar00392-0239-a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6610/327039/c8fda569c1fc/nar00392-0235-a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6610/327039/c5a6b665addc/nar00392-0237-a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6610/327039/fbbd79aeade4/nar00392-0238-a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6610/327039/95395c6efcb5/nar00392-0239-a.jpg

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1
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来自嗜菌摇蚊的富含AT的散布重复序列的结构与功能：螺线管状DNA、142 bp回文框架以及与细菌转座子位点特异性重组序列的同源性
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Chromosoma. 1982;87(4):389-407. doi: 10.1007/BF00327181.
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