Genome-wide analysis of microRNA targeting impacted by SNPs in cucumber genome

文献类型： 外文期刊

第一作者： Ling, Jian

作者： Ling, Jian;Luo, Zhongqin;Liu, Feng;Mao, Zhenchuan;Yang, Yuhong;Xie, Bingyan

作者机构：

关键词： Cucumber;MicroRNA;SNPs;Domestic selection

期刊名称：BMC GENOMICS （ 影响因子：3.969； 五年影响因子：4.478 ）

ISSN： 1471-2164

年卷期： 2017 年 18 卷

页码：

收录情况： SCI

摘要： Background: microRNAs (miRNAs) are endogenous small RNAs that play important regulatory functions in plant development. Genetic variations in miRNAs sequences or their target-binding sites (microRNA-target interaction sites) can alter miRNA targets in animal and human. Whether these single nucleotide polymorphisms (SNPs) in plant are functional have not yet been determined. Results: In this study, we constructed leaf, root, and stem-derived small libraries of cucumber (Cucumis sativus) line 9930 (cultivated China-group cucumber) and C. sativus var. hardwickii (wild India group cucumber). A total of 22 conserved miRNA families, nine less-conserved miRNA families, and 49 cucumber-specific miRNAs were identified in both line 9930 and hardwickii. We employed cucumber resequencing data to perform a genome-wide scan for SNPs in cucumber miRNA-target interaction sites, including miRNA mature sequences and miRNA-target binding sites. As a result, we identified a total of 19 SNPs in mature miRNA sequences and 113 SNPs in miRNA-target binding sites with the potential to affect miRNA-target interactions. Furthermore, we experimentally confirmed that these SNPs produced 14 9930-unique targets mRNAs and 15 hardwickii-unique targets mRNA for cucumber miRNAs. This is the first experimental validation of SNPs in miRNA-target interaction sites affecting miRNA-target binding in plants. Conclusions: Our results indicate that SNPs can alter miRNA function and produce unique miRNA targets in cultivated and wild cucumbers. Therefore, miRNA-related SNPs may have played important in events that led to the agronomic differences between domestic and wild cucumber.

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