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Transcription

Transcription

Overview
Transcription is the process of synthesizing RNA from a DNA sequence by RNA polymerase. It is the first step in producing a protein from a gene sequence. Additionally, many other proteins and regulatory sequences are involved in the proper synthesis of messenger RNA (mRNA). Regulation of transcription is responsible for the differentiation of all the different types of cells and often for the proper cellular response to environmental signals.
Transcription Can Produce Different Kinds...

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Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...

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Defining the Transcriptional Ecosystem.

Maruhen A D Silveira¹, Steve Bilodeau²

¹Centre de Recherche du CHU de Québec - Université Laval, Axe Oncologie, Québec, QC G1V 4G2, Canada; Centre de Recherche sur le Cancer de l'Université Laval, Québec, QC G1R 3S3, Canada.

|December 22, 2018

Summary

The study proposes a "transcriptional ecosystem equilibrium" model. This mechanism balances gene regulation between connected genes, viewing them as ecosystems rather than individuals during environmental changes.

Keywords:

RNA polymerase biochemical equilibriums chromosome architecture coordinated gene expression nuclear microenvironments phase-separated droplets three-dimensional genome organization transcription transcription coregulators transcriptional networks

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Area of Science:

Molecular Biology
Genetics
Biochemistry

Background:

Gene transcription is finely tuned by protein complexes within organized cellular environments.
Genome folding creates proximity between genes, influencing regulatory factor accumulation and local microenvironments.
The precise roles of this complex organization in controlling gene transcription require further exploration.

Purpose of the Study:

To propose a novel model for transcriptional regulation termed "transcriptional ecosystem equilibrium."
To describe a mechanism balancing transcriptional regulation between connected genes during environmental disturbances.
To reframe the understanding of gene responses to environmental factors.

Main Methods:

Drawing upon studies of chromosome architecture and gene localization to specific DNA structures.
Incorporating evidence of transcription machinery and coregulators forming dynamic phase separation droplets around active genes.
Conceptualizing connected genes as interconnected ecosystems.

Main Results:

The proposed model suggests transcriptional regulation operates as a biochemical equilibrium.
Environmental disturbances can impact this equilibrium, affecting connected genes.
Connected genes are proposed to function as "ecosystems" rather than isolated units.

Conclusions:

Defining connected genes as ecosystems provides a framework for understanding transcriptional regulation as a dynamic equilibrium.
This perspective necessitates a reassessment of both direct and indirect responses of genes to environmental disturbances.
The concept of transcriptional ecosystem equilibrium offers new insights into cellular responses to environmental changes.