The subtelomere of Oryza sativa chromosome 3 short arm as a hot bed of new gene origination in rice.

ABSTRACT: Despite general observations of non-random genomic distribution of new genes, it is unclear whether or not new genes preferentially occur in certain genomic regions driven by related molecular mechanisms. Using 1.5 Mb of genomic sequences from short arms of chromosome 3 of Oryza glaberrima and O. punctata, we conducted a comparative genomic analysis with the reference O. sativa ssp. japonica genome. We identified a 60-kb segment located in the middle of the subtelomeric region of chromosome 3, which is unique to the species O. sativa. The region contained gene duplicates that occurred in Asian cultivated rice species that diverged from the ancestor of Asian and African cultivated rice one million years ago (MYA). For the 12 genes and one complete retrotransposon identified in this segment

SUBMITTER: Fan C 

PROVIDER: S-EPMC2902912 | biostudies-literature | 2008 Sep

REPOSITORIES: biostudies-literature