Epigenetic malleability at core promoter initiates tobacco PR-1a expression post salicylic acid treatment

被引:3
|
作者
Lodhi, Niraj [1 ,2 ]
Singh, Mala [1 ]
Srivastava, Rakesh [1 ]
Sawant, Samir, V [1 ]
Tuli, Rakesh [1 ,3 ]
机构
[1] CSIR, Natl Bot Res Inst, Rana Pratap Marg, Lucknow 226001, Uttar Pradesh, India
[2] Mirna Analyt, New York, NY 19047 USA
[3] Panjab Univ, Univ Inst Engn & Technol UIET, Sect 25, Chandigarh 160014, India
关键词
Transcription; PR-1a; Epigenetics; Histone modifications; Nucleosome; LSD1; Salicylic acid; Trichostatin A; HISTONE ACETYLATION; GENE-EXPRESSION; CHROMATIN IMMUNOPRECIPITATION; DNA METHYLATION; TRANSCRIPTION; DEMETHYLATION; RESPONSES; ACETYLTRANSFERASE; TRIMETHYLATION; VERNALIZATION;
D O I
10.1007/s11033-022-08074-w
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Background Tobacco's PR-1a gene is induced by pathogen attack or exogenous application of salicylic acid (SA). Nucleosome mapping and chromatin immunoprecipitation assay were used to delineate the histone modifications on the PR-1a promoter. However, the epigenetic modifications of the inducible promoter of the PR-1a gene are not fully understood yet. Methods and results Southern approach was used to scan the promoter of PR-1a to identify presence of nucleosomes, ChIP assays were performed using anti-histones antibodies of repressive chromatin by di- methylated at H3K9 and H4K20 or active chromatin by acetylated H3K9/14 and H4K16 to find epigenetic malleability of nucleosome over core promoter in uninduced or induced state post SA treatment. Class I and II mammalian histone deacetylase (HDAC) inhibitor TSA treatment was used to enhance the expression of PR-1a by facilitating the histone acetylation post SA treatment. Here, we report correlated consequences of the epigenetic modifications correspond to disassembly of the nucleosome (spans from - 102 to + 55 bp, masks TATA and transcription initiation) and repressor complex from core promoter, eventually initiates the transcription of PR-1a gene post SA treatment. While active chromatin marks di and trimethylation of H3K4, acetylation of H3K9 and H4K16 are increased which are associated to the transcription initiation of PR-1a following SA treatment. However, in uninduced state constitutive expression of a negative regulator (SNI1) of AtPR1, suppresses AtPR1 expression by six-fold in Arabidopsis thaliana. Further, we report 50-to-1000-fold increased expression of AtPR1 in uninduced lsd1 mutant plants, up to threefold increased expression of AtPR1 in uninduced histone acetyl transferases (HATs) mutant plants, SNI1 dependent negative regulation of AtPR1, all together our results suggest that inactive state of PR-1a is indeed maintained by a repressive complex. Conclusion The study aimed to reveal the mechanism of transcription initiation of tobacco PR-1a gene in presence or absence of SA. This is the first study that reports nucleosome and repressor complex over core promoter region maintains the inactivation of gene in uninduced state, and upon induction disassembling of both initiates the downstream gene activation process.
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页码:417 / 431
页数:15
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