期刊
PLANT JOURNAL
卷 95, 期 6, 页码 961-975出版社
WILEY
DOI: 10.1111/tpj.14002
关键词
Arabidopsis; callus formation; epigenetic modification; H3K9me3; JMJ30; LBD
资金
- National Research Foundation of Korea [NRF-2016R1D1A1B03931139, NRF-2017R1A4A1015620]
- Next-Generation BioGreen 21 Program by the Rural Development Administration [PJ01314501]
- National Research Foundation of Korea [2016R1D1A1B03931139, 2017R1A4A1015620] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Plant somatic cells can be reprogrammed by in vitro tissue culture methods, and massive genome-wide chromatin remodeling occurs, particularly during callus formation. Since callus tissue resembles root primordium, conversion of tissue identity is essentially required when leaf explants are used. Consistent with the fact that the differentiation state is defined by chromatin structure, which permits limited gene profiles, epigenetic changes underlie cellular reprogramming for changes to tissue identity. Although a histone methylation process suppressing leaf identity during leaf-to-callus transition has been demonstrated, the epigenetic factor involved in activation of root identity remains elusive. Here, we report that JUMONJI C DOMAIN-CONTAINING PROTEIN 30 (JMJ30) stimulates callus formation by promoting expression of a subset of LATERAL ORGAN BOUNDARIES-DOMAIN (LBD) genes that establish root primordia. The JMJ30 protein binds to promoters of the LBD16 and LBD29 genes along with AUXIN RESPONSE FACTOR 7 (ARF7) and ARF19 and activates LBD expression. Consistently, the JMJ30-deficient mutant displays reduced callus formation with low LBD transcript levels. The ARF-JMJ30 complex catalyzes the removal of methyl groups from H3K9me3, especially at the LBD16 and LBD29 loci to activate their expression during leaf-to-callus transition. Moreover, the ARF-JMJ30 complex further recruits ARABIDOPSIS TRITHORAX-RELATED 2 (ATXR2), which promotes deposition of H3K36me3 at the LBD16 and LBD29 promoters, and the tripartite complex ensures stable LBD activation during callus formation. These results indicate that the coordinated epigenetic modifications promote callus formation by establishing root primordium identity.
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