文献类型： 外文期刊
作者： Shen, Enhui 1 ; Chen, Tianzi 4 ; Zhu, Xintian 1 ; Fan, Longjiang 1 ; Sun, Jie 5 ; Llewellyn, Danny J. 6 ; Wilson, Iain 6 ;
作者机构： 1.Zhejiang Univ, Coll Agr & Biotechnol, Inst Crop Sci, Hangzhou 310058, Peoples R China
2.Zhejiang Univ, Coll Agr & Biotechnol, Inst Bioinformat, Hangzhou 310058, Peoples R China
3.Zhejiang Univ, New Rural Dev Inst, Hangzhou 310058, Peoples R China
4.Jiangsu Acad Agr Sci, Inst Crop Germplasm & Biotechnol, Prov Key Lab Agrobiol, Nanjing 210014, Peoples R China
5.Shihezi Univ, Coll Agr, Key Lab Oasis Ecoagr, Shihezi 832000, Xinjiang, Peoples R China
6.CSIRO Agr & Food, Black Mt Labs, GPO Box 1700, Canberra, ACT 2601, Australia
关键词： miR482; 2118; NBS-LRR; miRNA evolution; transposable element; gene duplication; cotton; Gossypiumspp
期刊名称：PLANT JOURNAL （ 影响因子：6.417； 五年影响因子：7.627 ）
ISSN： 0960-7412
年卷期：
页码：
收录情况： SCI
摘要： Some plant microRNA (miRNA) families contain multiple members generating identical or highly similar mature miRNA variants. Mechanisms underlying the expansion of miRNA families remain elusive, although tandem and/or segmental duplications have been proposed. In this study of two tetraploid cottons,Gossypium hirsutumandGossypium barbadense, and their extant diploid progenitors,Gossypium arboreumandGossypium raimondii, we investigated the gain and loss of members of the miR482/2118 superfamily, which modulates the expression of nucleotide-binding site leucine-rich repeat (NBS-LRR) disease resistance genes. We found significant expansion ofMIR482/2118dinG. barbadense,G. hirsutumandG. raimondii, but not inG. arboreum. Several newly expandedMIR482/2118dloci have mutated to produce different miR482/2118 variants with altered target-gene specificity. Based on detailed analysis of sequences flanking theseMIR482/2118loci, we found that this expansion ofMIR482/2118dand its derivatives resulted from an initial capture of anMIR482/2118dby a class-II DNA transposable element (TE) inG. raimondiiprior to the tetraploidization event, followed by transposition to new genomic locations inG. barbadense,G. hirsutumandG. raimondii. The 'GosTE' involved in the capture and proliferation ofMIR482/2118dand its derivatives belongs to thePIF/Harbingersuperfamily, generating a 3-bp target site duplication upon insertion at new locations. All orthologousMIR482/2118loci in the two diploids were retained in the two tetraploids, but mutation(s) in miR482/2118 were observed across all four species as well as in different cultivars of bothG. barbadenseandG. hirsutum, suggesting a dynamic co-evolution of miR482/2118 and itsNBS-LRRtargets. Our results provide fresh insights into the mechanisms contributing toMIRNAproliferation and enrich our knowledge on TEs.
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