Genetica. 2006 Mar;126(3):335-42.

Polymorphic chromosomal specificity of centromere satellite families in Arabidopsis halleri ssp. gemmifera.

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Laboratory of Plant Genetics, Graduate School of Agriculture, Kyoto University, Kitashirakawa Oiwake-cho, 606-8502, Sakyo-ku, Kyoto, Japan. akirakawabe@hotmail.com

Abstract

The chromosomal localizations of repetitive DNA clusters (ribosomal DNA and centromere satellites) were analyzed by fluorescent in situ hybridization in five strains of Arabidopsis halleri ssp. gemmifera. All five A. gemmifera strains have three chromosome pairs with 45S (5.8S-16S-26S) rDNA loci, and one pair with both 5S and 45S rDNA loci. These localizations are different from that of A. thaliana. Very unusually, there are three families of centromeric satellite DNAs (pAa, pAge1, and pAge2), and they showed polymorphism among the five strains studied. Overall, we found four different centromere satellite compositions. A plant from Fumuro was heterozygous for the chromosome specificities of centromere satellite families, possibly due to a reciprocal translocation involving centromere regions. Changes of centromeric satellite repeats appear to be rapid and frequent events in the history of A. gemmifera, and seem to occur by exchanging clusters as units.

PMID:: 16636927; [PubMed - indexed for MEDLINE]

Publication Types, MeSH Terms, Substances

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Research Support, Non-U.S. Gov't

MeSH Terms

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DNA, Ribosomal

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