数字农科院2.0

Transposable element-mediated DNA methylation of the NAC20 and NAC26 promoters led to a maternal effect on grain filling

文献类型： 外文期刊

作者： Wu, Ming-Wei;Li, Rong;Wei, Wen-Tao;Chen, Meng-Meng;Liu, Jin-Lei;Cheng, Han;Yang, Tao;Zhang, Jin-Dan;Liu, Jinxin;Liu, Chun-Ming

作者机构：

关键词： allele-specific expression;DNA methylation;maternal effect;transposable element

期刊名称： JOURNAL OF INTEGRATIVE PLANT BIOLOGY

ISSN： 1672-9072

年卷期： 2025 年

页码：

收录情况： SCIE（2025版） ; ; CSCD（2025-2026年度） ; ; 科技核心（2024版）

摘要： Parent-of-origin effects are usually caused by selective expression of maternal or paternal alleles. Although genome-wide studies suggest that imprinted gene expression occurs primarily in the endosperm in plants, detailed studies of allele-specific gene expression and its associations with parent-of-origin phenotypes are scarce. NAC20 and NAC26 (NAC20/26 hereafter), a pair of tightly linked NAC-family transcription factors, redundantly regulate grain filling and albumin accumulation in rice endosperm. Here, we show that NAC20/26 exhibited allele-specific maternal expression, and the floury endosperm phenotype of the nac20/26 double mutant was inherited with a maternal effect. Further studies showed that the imprinted NAC20/26 expression and floury endosperm phenotype with a maternal effect are associated with insertions of two TEs in NAC20/26 of two Japonica rice varieties, but not in two Indica ones examined. The maternal NAC20/26 expression was associated with elevated DNA methylation in their paternal DMRs, and deletions of those TEs by gene editing led to decreased methylation in these DMRs, and biallelic NAC20/26 expression. Geographical analyses showed that Japonica varieties with high-latitude origins examined carried these TEs. These results establish that TE-mediated DNA methylation lead to grain filling with a maternal effect in high-latitude Japonica rice varieties, which may associate with northward expansion of rice during domestication.

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