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high auxin stimulates callus through SDG8-mediated histone h3k36 methylation in Arabidopsis

Journal of Integrative Plant Biology 2022年第12期64卷 2425-2437页

作者： Jun Ma Qiang Li Lei Zhang Sen Cai Yuanyuan Liu Juncheng Lin Rongfeng huang Yongqiang Yu Mingzhang Wen Tongda Xu College of Life Sciences Fujian Agriculture and Forestry UniversityFuzhou 350002China Plant Synthetic Biology Center FAFU-UCR Joint Center for Horticultural Biology and MetabolomicsHaixia Institute of Science and TechnologyFujian Agriculture and Forestry UniversityFuzhou 350002China Shanghai Center for Plant Stress Biology CAS Center for Excellence in Molecular Plant SciencesChinese Academy of SciencesShanghai 201602China Basic Forestry and Proteomics Research Center Haixia Institute of Science and TechnologyFujian Agricuture and Forestry UniversityFuzhou 350002China Frontiers Science Center for Synthetic Biology(Ministry of Education) Tianin UniversityTianjin 300072China

Callus induction,which results in fate transition in plant cells,is considered as the first and key step for plant regeneration.This process can be stimulated in different tissues by a callus-inducing medium(CIM),which contains a high concentration of phytohormone auxin.Although a few key regulators for callus induction have been identified,the multiple aspects of the regulatory mechanism driven by high levels of auxin still need further investigation.here,we find that high auxin induces callus through a h3 k36 histone methylation-dependent mechanism,which requires the methyltransferase SET DOMAIN GROUP 8(SDG8).During callus induction,the increased auxin accumulates SDG8 expression through a TIR1/AFBs-based transcriptional regulation.SDG8 then deposits h3 k36 me3 modifications on the loci of callus-related genes,including a master regulator WOX5 and the cell proliferation-related genes,such as CYCB1.1.This epigenetic regulation in turn is required for the transcriptional activation of these genes during callus formation.These findings suggest that the massive transcriptional reprogramming for cell fate transition by auxin during callus formation requires epigenetic modifications including SDG8-mediated histone h3 k36 methylation.Our results provide insight into the coordination between auxin signaling and epigenetic regulation during fundamental processes in plant development.

关键词： auxin callus formation epigenetic regulation h3k36 methylation SDG8 TIR1/AFBs

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Roles of h3k36-specific histone methyltransferases in transcription: antagonizing silencing and safeguarding transcription fidelity

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Biophysics Reports 2018年第4期4卷 170-177页

作者： Chang huang Bing Zhu National Laboratory of Biomacromolecules CAS Center for Excellence in Biomacromolecules Institute of Biophysics Chinese Academy of Sciences College of Life Sciences University of Chinese Academy of Sciences

histone h3k36 methylation is well-known for its role in active transcription. In Saccharomyces cerevisiae, h3k36 methylation is mediated solely by SET2 during transcription elongation. In metazoans,multiple h3k36-specific methyltransferases exist and contribute to distinct biochemical activities and subsequent functions. In this review, we focus on the h3k36-specific histone methyltransferases in metazoans, and discuss their enzymatic activity regulation and their roles in antagonizing Polycomb silencing and safeguarding transcription fidelity.

关键词： Ash1L h3k36 methylation histone methyltransferase NSD SETD2

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SDG724 mediates h3k36me2/3 deposition at MADS50 and RFT1,and promotes flowering in rice

SDG724 mediates H3K36me2/3 deposition at MADS50 and RFT1,and...

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从植物科学到农业发展——2012全国植物生物学大会

作者： Changhui Sun,Jun Fang,Taolan Zhao,Bo Xu,Fantao Zhang,Linchuan Liu,Jiuyou Tang, Xiaojian Deng,Fan Chen,Qian Qian,Xiaofeng Cao,Chengcai Chu Institute of Genetics and Developmental Biology,Chinese Academy of Sciences,Beijing 100101,China.

Chromatin modifications are known to affect flowering time in the long-day(LD) plant Arabidopsis.however,the role of histone methylation in flowering time regulation of rice, a short-day(SD) plant,remains to be elucidated.We identified a late-flowering long vegetative phase 1(lvp1) mutant in rice,and map-based cloning revealed that LVP1 encodes the SET domain group protein 724(SDG724).Biochemical characterization showed that SDG724 is an active histone methyltransferase in vitro and contributes to a major fraction of global h3k36 methylation in vivo.Expression analyses of flowering time genes in wild-type and lvp1 mutants revealed that Ehd1,but not hd1,are misregulated in SDG724 loss of function mutants to promote flowering under both SD and LD conditions. In addition,the lvp1 se5 double mutant flowered later than the se5 single mutant,indicating that lesions in SDG724 delay flowering time irrespective of photoperiod.ChIP assays showed that Ivp1 had reduced levels of h3k36me2/3 within certain chromatin regions of Os MADS50 and RFT1.This suggests that the divergent functions of paralogs RFT1 and hd3a,and of Os MADS50 and MADS51 are in part due to differential h3k36me2/3 deposition,which also correlates with higher expression levels of Os MADS50 and RFT1 in flowering promotion of rice.

关键词： rice flowering transition histone methyltransferase h3k36 methylation florigen

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