Analysis of 5S rDNA arrays in Arabidopsis thaliana:: Physical mapping and chromosome-specific polymorphisms

被引:60
作者
Cloix, C [1 ]
Tutois, S [1 ]
Mathieu, O [1 ]
Cuvillier, C [1 ]
Espagnol, MC [1 ]
Picard, G [1 ]
Tourmente, S [1 ]
机构
[1] Univ Blaise Pascal, Unite Mixte Rech, F-63177 Clermont Ferrand, France
关键词
D O I
10.1101/gr.10.5.679
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 physical map of a pericentromeric region of chromosome 5 containing a 5S rDNA locus and spanning -1000 kb was established using the CIC YAC clones. Three 5S rDNA arrays were resolved in this YAC contig by PFGE analysis and we have mapped different types of sequences between these three blocks. 5S rDNA units from each of these three arrays of chromosome 5, and from chromosomes 3 and 4, were isolated by PCR. A total of 38 new DNA sequences were obtained. Two types of 5S rDNA repeated units exist: the major variant with 0.5-kb repeats and one with short repeats (251 bp) only detected on YAC 11A3 from chromosome 3. Although the 38 sequences displayed noticeable heterogeneity, we were able to group them according to their 5S array origin. The presence of 5S array-specific variants was confirmed with the restriction polymorphism study of all the YACs carrying 5S units.
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页码:679 / 690
页数:12
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