期刊
BIOCHIMICA ET BIOPHYSICA ACTA-GENE REGULATORY MECHANISMS
卷 1861, 期 4, 页码 295-309出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.bbagrm.2017.11.008
关键词
RNA polymerase III; Chromatin remodeling; Epigenetic mechanisms; Nucleosome positioning, Histone modifications, Histone Chaperones, tRNA genes; TFIIIB and TFIIIC; Transcription regulation
资金
- DBT (Govt. of India) [BT/PR11668/BRB/10/1283/2014]
The short, non-coding genes transcribed by the RNA polymerase (pol) III, necessary for survival of a cell, need to be repressed under the stress conditions in vivo. The pol III-transcribed genes have adopted several novel chromatin-based regulatory mechanisms to their advantage. In the budding yeast, the sub-nucleosomal size tRNA genes are found in the nucleosome-free regions, flanked by positioned nucleosomes at both the ends. With their chromosomes-wide distribution, all tRNA genes have a different chromatin context. A single nucleosome dynamics controls the accessibility of the genes for transcription. This dynamics operates under the influence of several chromatin modifiers in a gene-specific manner, giving the scope for differential regulation of even the isogenes within a tRNA gene family. The chromatin structure around the pol III-transcribed genes provides a context conducive for steady-state transcription as well as gene-specific transcriptional regulation upon signaling from the environmental cues. This article is part of a Special Issue entitled: SI: Regulation of tRNA synthesis and modification in physiological conditions and disease edited by Dr. Boguta Magdalena.
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