Genome-wide screening and analysis of imprinted genes in rapeseed (Brassica napus L.) endosperm

文献类型： 外文期刊

第一作者： Liu, Jing

作者： Liu, Jing;Li, Jun;Liu, Hong-fang;Fan, Shi-hang;Hu, Zhi-yong;Wang, Han-zhong;Hua, Wei;Singh, Surinder;Zhou, Xue-Rong

作者机构：

关键词： rapeseed; endosperm; RNA sequencing; imprinting; allele-specific; DNA methylation

期刊名称：DNA RESEARCH （ 影响因子：4.458； 五年影响因子：5.371 ）

ISSN： 1340-2838

年卷期： 2018 年 25 卷 6 期

页码：

收录情况： SCI

摘要： Species-specific genomic imprinting is an epigenetic phenomenon leading to parent-of-origin-specific differential expression of maternally and paternally inherited alleles. To date, no studies of imprinting have been reported in rapeseed, a tetraploid species. Here, we analysed global patterns of allelic gene expression in developing rapeseed endosperms from reciprocal crosses between inbred lines YN171 and 93275. A total of 183 imprinted genes, consisting of 167 maternal expressed genes (MEGs) and 16 paternal expressed genes (PEGs), were identified from 14,394 genes found to harbour diagnostic SNPs between the parental lines. Some imprinted genes were validated in different endosperm stages and other parental combinations by RT-PCR analysis. A clear clustering of imprinted genes throughout the rapeseed genome was identified, which was different from most other plants. Methylation analysis of 104 out of the 183 imprinted genes showed that 11 genes (7 MEGs and 4 PEGs) harboured differentially methylated regions (DMRs). Unexpectedly, only 1 MEG out of these 11 genes had a DMR that exhibited high CG methylation rate in paternal allele and had big difference between parent alleles. These results extend our understanding of gene imprinting in plants and provide potential avenues for further research in imprinted genes.

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