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Genome-wide study of OsNF-YB1 regulatory network in rice

ABSTRACT: This SuperSeries is composed of the SubSeries listed below.

ORGANISM(S): Oryza sativa

PROVIDER: GSE72187 | GEO | 2016/12/16

SECONDARY ACCESSION(S): PRJNA293275

REPOSITORIES: GEO

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Genome-wide characterization of cis-acting DNA targets of OsNF-YB1 in rice

Project description:OsNF-YB1 is a transcription factor that plays important roles during rice grain filling. OsNF-YB1 is specifically expressed in aleurone layer of developing endosperm and OsNF-YB1 RNAi lines showed retardation in grain filling and produced small grains with chalky endosperm as well as the altered starch quality. To reveal the transcriptional regulatory framework of OsNF-YB1, we determined OsNF-YB1 DNA binding targets using chromatin immunoprecipitation coupled to high-throughput sequencing (ChIP-Seq). ChIP-Seq analysis detected 933 binding peaks distributed 743 neighbor genes. OsNF-YB1 directly regulates genes involved in nutrient transport including sugar and amino acids, and interestingly, different from the reported binding site of NF-Y complex, the GCC-box (a binding motif of ERF transcription factors) was enriched in the binding peaks of OsNF-YB1.

2016-12-16 | GSE72186 | GEO

Rice aleurone layer specific OsNF-YB1 regulates grain filling and endosperm development by interacting with an ERF transcription factor.

Project description:Grain yield and quality of rice mainly depend on grain filling and endosperm development. Here we report that a rice NUCLEAR FACTOR Y (NF-Y) transcription factor, OsNF-YB1, is specifically expressed in the aleurone layer of developing endosperm and regulates grain filling and endosperm development. Knockdown of OsNF-YB1 expression by RNAi significantly retarded grain filling, leading to small grains with chalky endosperm as well as altered starch quality. Whereas OsNF-YB1 shows subcellular localization in both the cytosol and the nucleus in roots, it was specifically targeted to the nucleus of aleurone layer cells, which was facilitated by interacting with OsNF-YC proteins preferentially expressed in the aleurone layer. RNA sequencing analysis revealed that genes related to membrane transport and ATP biosynthesis were enriched in the down-regulated category in OsNF-YB1 RNAi plants, which is consistent with the crucial role of OsNF-YB1 in rice grain filling and endosperm development. Identification of the genome-wide targets of OsNF-YB1 by ChIP sequencing showed that OsNF-YB1 directly regulates genes involved in the transport of nutrients such as sugar and amino acids. Interestingly, different from the binding sites reported for other NF-Y complexes, the GCC box, the binding motif of ERF transcription factors, was enriched in the binding peaks of OsNF-YB1. Indeed, further analyses confirmed the interaction of OsERF#115 with OsNF-YB1, and OsERF#115 directly binds to the GCC box. It is proposed that OsNF-YB1 specifically regulate the transcription of downstream genes during rice endosperm development by forming protein complexes consisting of OsNF-YB1, OsNF-YC and ERF, providing informative insights into the molecular functional mechanisms of the NF-Y factor.

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Project description:Rice NF-YC11 is a transcription factor that plays a key regulatory role in storage substance accumulation during rice grain filling. To reveal the transcription regulatory network of NF-YC11 in rice, we performed genome-wide identification of NF-YC11 targets by immunoprecipitation sequencing (ChIP-seq) analyses in the NF-YC11-overexpression plants.

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Project description:This SuperSeries is composed of the SubSeries listed below. Refer to individual Series

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Genome-wide study of NF-YC11 regulatory network in rice

Project description:Genome-wide study of NF-YC11 regulatory network in rice

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