Genomic distribution of simple sequence repeats in Brassica rapa

Cited 0 time in scopus
Metadata Downloads
Title
Genomic distribution of simple sequence repeats in Brassica rapa
Author(s)
C P Hong; Z Y Piao; T W Kang; J Batley; T J Yang; Y K Hur; Jong Bhak; B S Park; D Edwards; Y P Lim
Bibliographic Citation
Molecules and Cells, vol. 23, no. 3, pp. 349-356
Publication Year
2007
Abstract
Simple Sequence Repeats (SSRs) represent short tandem duplications found within all eukaryotic organisms. To examine the distribution of SSRs in the genome of Brassica rapa ssp. pekinensis, SSRs from different genomic regions representing 17.7 Mb of genomic sequence were surveyed. SSRs appear more abundant in non-coding regions (86.6%) than in coding regions (13.4%). Comparison of SSR densities in different genomic regions demonstrated that SSR density was greatest within the 5′-flanking regions of the predicted genes. The proportion of different repeat motifs varied between genomic regions, with trinucleotide SSRs more prevalent in predicted coding regions, reflecting the codon structure in these regions. SSRs were also preferentially associated with gene-rich regions, with pericentromeric heterochromatin SSRs mostly associated with retrotransposons. These results indicate that the distribution of SSRs in the genome is non-random. Comparison of SSR abundance between B. rapa and the closely related species Arabidopsis thaliana suggests a greater abundance of SSRs in B. rapa, which may be due to the proposed genome triplication. Our results provide a comprehensive view of SSR genomic distribution and evolution in Brassica for comparison with the sequenced genomes of A. thaliana and Oryza sativa.
Keyword
Arabidopsis thalianaBrassica rapa ssp. pekinensisGenomic distributionMicrosatelliteSimple Sequence Repeat (SSR)
ISSN
1016-8478
Publisher
Korea Soc-Assoc-Inst
Type
Article
Appears in Collections:
1. Journal Articles > Journal Articles
Files in This Item:
  • There are no files associated with this item.


Items in OpenAccess@KRIBB are protected by copyright, with all rights reserved, unless otherwise indicated.