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Transcription Attenuation in Prokaryotes02:42

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Transcriptional attenuation occurs when RNA transcription is prematurely terminated due to the formation of a terminator mRNA hairpin structure.  Bacteria use these hairpins to regulate the transcription process and control the synthesis of several amino acids including histidine, lysine, threonine, and phenylalanine. Transcription attenuation takes place in the non-coding regions of mRNA.
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In eukaryotic cells, nascent mRNA transcripts need to undergo many post-transcriptional modifications to reach the cell cytoplasm and translate into functional proteins. For a long time, transcription and pre-mRNA processing were considered two independent events that occur sequentially in the cell. However, it has now been well established that transcription and pre-mRNA processing are two simultaneous processes that are precisely regulated inside the cell.
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Prokaryotic genomes exhibit a streamlined organization of coding and non-coding regions essential for gene expression and protein synthesis. While coding regions contain the genetic instructions for proteins or functional RNAs, non-coding regions regulate the precise transcription and translation of these genes.Coding Regions: Proteins and RNAsThe primary coding regions, known as structural genes, include sequences transcribed into messenger RNA (mRNA) and ultimately translated into...
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Proteins that regulate transcription can do so either via direct contact with RNA Polymerase or through indirect interactions facilitated by adaptors, mediators, histone-modifying proteins, and nucleosome remodelers. Direct interactions to activate transcription is seen in bacteria as well as in some eukaryotic genes. In these cases, upstream activation sequences are adjacent to the promoters, and the activator proteins interact directly with the transcriptional machinery. For example, in...
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In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
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A gene is the fundamental unit of heredity. Every individual has two copies of each gene, one inherited from each parent. Although most people contain the same genes, there is a small fraction that is slightly different amongst people. A gene with a small difference in its sequence of DNA bases forms different alleles, contributing to different phenotypes.
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Phase Separation Properties in Transcriptional Organization.

Chenghao Guo1, Zhuojuan Luo1, Chengqi Lin1

  • 1Key Laboratory of Developmental Genes and Human Disease, School of Life Science and Technology, Southeast University, Nanjing 210096, China.

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|August 11, 2022
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Summary

Biomolecular condensates drive transcription regulation by organizing cellular activities. This review explores how phase separation influences RNA polymerase II transcription and condensate dynamics.

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Area of Science:

  • Molecular Biology
  • Biophysics
  • Cell Biology

Background:

  • Transcription is crucial for cellular processes like stress response and development.
  • It requires the coordinated action of numerous transcription factors and cofactors.
  • Rapid assembly of transcription machinery is essential for cellular needs.

Purpose of the Study:

  • To summarize recent advances in understanding transcription regulation.
  • To focus on the role of phase separation in RNA polymerase II (Pol II)-mediated transcription.
  • To discuss the physical properties and dynamics of transcriptional condensates.

Main Methods:

  • Literature review and synthesis of recent research findings.
  • Focus on biophysical principles of phase separation in cellular contexts.
  • Analysis of studies investigating transcriptional condensates.

Main Results:

  • Phase-separated biomolecular condensates provide a framework for spatiotemporal coordination of transcription.
  • These condensates dynamically regulate the assembly and function of transcription machineries.
  • Understanding the physical properties and dynamics of condensates is key to their regulatory role.

Conclusions:

  • Phase separation is a fundamental biophysical mechanism underlying transcriptional regulation.
  • Transcriptional condensates offer new insights into how cells control gene expression.
  • Further research into condensate dynamics will illuminate cellular responses and development.