Large-scale polymorphism of heterochromatic repeats in the DNA of Arabidopsis thaliana.

ABSTRACT:

Background

The composition of the individual eukaryote's genome and its variation within a species remain poorly defined. Even for a sequenced genome such as that of the model plant Arabidopsis thaliana accession Col-0, the large arrays of heterochromatic repeats are incompletely sequenced, with gaps of uncertain size persisting in them.

Results

Using geographically separate populations of A. thaliana, we assayed variation in the heterochromatic repeat arrays using two independent methods and identified significant polymorphism among them, with variation by as much as a factor of two in the centromeric 180 bp repeat, in the 45S rDNA arrays and in the Athila retroelements. In the accession with highest genome size as measured by flow cytometry, Loh-0, we found more than a two

SUBMITTER: Davison J 

PROVIDER: S-EPMC2000876 | biostudies-literature | 2007 Aug

REPOSITORIES: biostudies-literature