© 2000 by Kazusa DNA Research Institute
The Size and Sequence Organization of the Centromeric Region of Arabidopsis thaliana Chromosome 5
The Laboratory of Chromosome Research II, Kazusa DNA Research Institute Yana 1532-3, Kisarazu, Chiba 292-0812, Japan
* To whom correspondence should be addressed. Tel. +81-438-52-3920, Fax. +81-438-52-3921, E-mail: kotani{at}kazusa.or.jp
We have determined the size of the centromeric region of Arabidopsis thaliana chromosome 5, which corresponds to the genetically defined centromere by Copenhaver et al. (Science, 286, 2468–2474, 1999) on the basis of restriction analysis. As a large clone gap was present in the previously constructed contig map of the centromeric region, the restriction map of this region was constructed using Asc I, Not I, Apa I and Pme I and genomic DNA from a hypomethylated strain. The size of the centromeric region finally estimated by combination with the sequence data of cloned regions at both sides was 4.35 megabases (Mb). This value is over 2 Mb longer than those estimated in our previous work and also by Copenhaver et al. Combing this centromeric region with the physical map previously constructed, the entire length of chromosome 5 becomes 31 Mb. Although the internal moiety of the centromeric region has not been sequenced yet because of extremely high repetition, the result of sequence analysis from both sides toward the inside strongly suggests that the centromeric region is composed of the central 2.9-Mb domain consisting of mainly 180-bp repeats and Athila retrotransposons and flanking regions containing various types of transposons. On the basis of these observations, a structural model for the centromeric region is discussed.
Key words: physical map; centromere; Arabidopsis thaliana
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