RICE SCIENCE ›› 2005, Vol. 12 ›› Issue (3): 173-178 .

• 研究报告 • 上一篇    下一篇

Small-Scale Duplications Play a Significant Role in Rice Genome Evolution

GUO Xin-yi, XU Guo-hua, ZHANG Yang, HU Wei-min, FAN Long-jiang   

  1. Institute of Crop Science / Institute of Bioinformatics, Zhejiang University, Hangzhou 310029, China
  • 收稿日期:2005-04-04 出版日期:2005-09-28 发布日期:2005-09-28
  • 通讯作者: FAN Long-jiang
  • 基金资助:
    the National Natural Science Foundation of China (90208022 and30471067) and IBM Shared University Research (Life Science) .

摘要: Genes are continually being created by the processes of genome duplication (ohnolog) and gene duplication (paralog). Whole-genome duplications have been found to be widespread in plant species and play an important role in plant evolution. Clearly un-overlapping duplicated blocks of whole-genome duplications can be detected in the genome of sequenced rice (Oryza sativa). Syntenic ohnolog pairs (ohnologues) of the whole-genome duplications in rice were identified based on their syntenic duplicate lines. The paralogs of ohnologues were further scanned using multi-round reciprocal BLAST best-hit searching (E<e-14). The results indicated that an average of 0.55 sister paralogs could be found for every ohnologue in rice. These results suggest that small-scale duplications, as well as whole-genome duplications, play a significant role in the two duplicated rice genomes.

关键词: small-scale duplication, ohnologue, genome evolution, Oryza sativa, Arabidopsis