title: Duplication and expression analysis of multicopy miRNA gene family members in Arabidopsis and rice.
abstract: To understand the expansion of multicopy microRNA (miRNA) families in plants, we localized the reported miRNA genes from Arabidopsis and rice to their chromosomes, respectively, and observed that 37% of 117 miRNA genes from Arabidopsis and 35% of 173 miRNA genes from rice were segmental duplications in the genome. In order to characterize whether the expression diversification has occurred among plant multicopy miRNA family members, we designed PCR primers targeting 48 predicted miRNA precursors from 10 families in Arabidopsis and rice. Results from RT-PCR data suggest that the transcribed precursors of members within the same miRNA family were present at different expression levels. In addition, although miR160 and miR162 sequences were conserved in Arabidopsis and rice, we found that the expression patterns of these genes differed between the two species. These data suggested that expression diversification has occurred in multicopy miRNA families, increasing our understanding of the expression regulation of miRNAs in plants.
authors.affiliation: SJTU-SIBS-PSU Joint Center for Life Sciences, School of Life Science and Biotechnology, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China.
authors.forename: Danhua
authors.initials: D
authors.lastname: Jiang
authors.forename: Changsong
authors.initials: C
authors.lastname: Yin
authors.forename: Aiping
authors.initials: A
authors.lastname: Yu
authors.forename: Xiaofan
authors.initials: X
authors.lastname: Zhou
authors.forename: Wanqi
authors.initials: W
authors.lastname: Liang
authors.forename: Zheng
authors.initials: Z
authors.lastname: Yuan
authors.forename: Yun
authors.initials: Y
authors.lastname: Xu
authors.forename: Qingbo
authors.initials: Q
authors.lastname: Yu
authors.forename: Tieqiao
authors.initials: T
authors.lastname: Wen
authors.forename: Dabing
authors.initials: D
authors.lastname: Zhang
mesh_terms: D017360:Arabidopsis / Q000235:genetics* / Q000378:metabolism; D001483:Base Sequence; D002874:Chromosome Mapping; D032461:Chromosomes, Plant / Q000235:genetics; D020440:Gene Duplication; D018506:Gene Expression Regulation, Plant; D017343:Genes, Plant / Q000235:genetics; D035683:MicroRNAs / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D008969:Molecular Sequence Data; D009690:Nucleic Acid Conformation; D012275:Oryza / Q000235:genetics* / Q000378:metabolism; D010940:Plant Proteins / Q000235:genetics / Q000378:metabolism; D012323:RNA Processing, Post-Transcriptional; D020133:Reverse Transcriptase Polymerase Chain Reaction; D012689:Sequence Homology, Nucleic Acid
chemical_list: D035683:MicroRNAs; D010940:Plant Proteins