STRUCTURE AND EVOLUTION OF A HIGHLY REPETITIVE DNA-SEQUENCE FROM BRASSICA-NAPUS

被引：34

作者：

XIA, XJ

SELVARAJ, G

BERTRAND, H

机构：

[1] UNIV GUELPH,DEPT MICROBIOL,GUELPH N1G 2W1,ONTARIO,CANADA

[2] NATL RES COUNCIL CANADA,ATLANTIC REG LAB,INST PLANT BIOTECHNOL,HALIFAX B3H 3Z1,NS,CANADA

来源：

PLANT MOLECULAR BIOLOGY | 1993年 / 21卷 / 02期

关键词：

BRASSICA; REPETITIVE DNA; INSITU HYBRIDIZATION;

D O I：

10.1007/BF00019938

中图分类号：

Q5 [生物化学]; Q7 [分子生物学];

学科分类号：

071010 ; 081704 ;

摘要：

A Hind III family of highly repetitive DNA sequences, canrep (canola repeat), was cloned from the nuclear DNA of canola (Brassica napus cv. Westar). The basic units of this family of repeats consists of 176 bp and are arranged in clusters of tandem direct repeats. Each canrep repeat is composed of three related subrepeats of ca. 60 bp. Each subrepeat contains two inverted repeats of about 23 bp and another unrelated sequence of about 12 bp. Based on the internal structure, a possible scheme for the evolution of canrep is proposed. At least two subfamilies of the canrep sequences are present in the genome, as revealed by sequence analyses. In situ hybridization showed that canrep sequences are mainly clustered at centromeric regions of chromosomes. Northern hybridizations indicate that there are no transcripts related to canrep in the total RNAs extracted from plant seedlings.

引用

页码：213 / 224

页数：12

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