Evolution of ribosomal DNA-derived satellite repeat in tomato genome.

ABSTRACT:

Background

Tandemly repeated DNA, also called as satellite DNA, is a common feature of eukaryotic genomes. Satellite repeats can expand and contract dramatically, which may cause genome size variation among genetically-related species. However, the origin and expansion mechanism are not clear yet and needed to be elucidated.

Results

FISH analysis revealed that the satellite repeat showing homology with intergenic spacer (IGS) of rDNA present in the tomato genome. By comparing the sequences representing distinct stages in the divergence of rDNA repeat with those of canonical rDNA arrays, the molecular mechanism of the evolution of satellite repeat is described. Comprehensive sequence analysis and phylogenetic analysis demonstrated that a long terminal repeat retrotransposon w

SUBMITTER: Jo SH 

PROVIDER: S-EPMC2679016 | biostudies-literature | 2009 Apr

REPOSITORIES: biostudies-literature