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Related Concept Videos

Transcription01:10

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...
Transcription01:17

Transcription

Transcription is the synthesis of 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 correctly synthesizing messenger RNA (mRNA). Transcriptional regulation is responsible for the differentiation of different types of cells and often for the proper cellular response to environmental signals.
Transcription Can Produce Different Kinds of RNA Molecules
In eukaryotes,...
Transduction01:16

Transduction

Among the three main modes of HGT—transformation, conjugation, and transduction—transduction is unique in that it is mediated by bacteriophages, or bacterial viruses.Transduction occurs in two ways. Generalized transduction occurs during the lytic cycle of a bacteriophage infection. In this process, bacteriophages infect bacterial cells, replicate within them, and ultimately cause cell lysis, releasing newly assembled virions. Occasionally, random fragments of the bacterial genome are...
TGF - β Signaling Pathway01:16

TGF - β Signaling Pathway

The TGF-β signaling pathway regulates cell growth, differentiation, adhesion, motility, and development. TGF-β ligands that induce TGF-β signaling are synthesized in their latent form. Several proteases or cell surface receptors such as integrins act upon the latent form, releasing the active ligand. There are three types of mammalian TGF-βs: (TGF-β1, TGF-β2, and TGF-β3) that bind as homodimers or heterodimers to TGF-β receptors. The TGF-β receptors are of three kinds RI, RII, and RIII. The RI...
Regulation of Expression at Multiple Steps01:23

Regulation of Expression at Multiple Steps

The gene expression in cells is regulated at different stages: (i) transcription, (ii) RNA processing, (iii) RNA localization, and (iv) translation. Transcriptional regulation is mediated by regulatory proteins such as transcription factors, activators, or repressors—these control gene expression by initiating or inhibiting the transcription of genes. Once a precursor or pre-mRNA is produced, it undergoes post-transcriptional modification, including 5' capping, splicing, and the addition of a...
Gene-Environment Interactions01:20

Gene-Environment Interactions

Gene expression is a dynamic process that is significantly influenced by environmental factors. This interaction underlies the complex nature of biological development and the phenotypic differences observed among individuals, even among those with identical genetic makeups. Factors such as radiation, temperature, behavior, nutrition, and stress play pivotal roles in determining how genes are expressed. The concept of the reaction range is central to understanding this interaction. It posits...

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Related Experiment Video

Updated: May 26, 2026

Geomagnetic Field (Gmf) and Plant Evolution: Investigating the Effects of Gmf Reversal on Arabidopsis thaliana Development and Gene Expression
11:04

Geomagnetic Field (Gmf) and Plant Evolution: Investigating the Effects of Gmf Reversal on Arabidopsis thaliana Development and Gene Expression

Published on: November 30, 2015

Antagonistic gene transcripts regulate adaptation to new growth environments.

Bridget L Baumgartner1, Matthew R Bennett, Michael Ferry

  • 1Department of Bioengineering, University of California at San Diego, La Jolla, CA 92093, USA.

Proceedings of the National Academy of Sciences of the United States of America
|December 14, 2011
PubMed
Summary
This summary is machine-generated.

Enhanced mRNA degradation in yeast cells offers a temporary growth benefit by easing competition for translation, aiding adaptation to changing carbon sources.

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Last Updated: May 26, 2026

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Area of Science:

  • Molecular Biology
  • Cellular Regulation
  • Yeast Genetics

Background:

  • Cells utilize complex regulatory networks to adapt gene expression to environmental changes.
  • Redundant mechanisms operate at multiple gene expression levels for cellular adaptation.
  • The galactose utilization network in Saccharomyces cerevisiae is a model for studying gene regulation.

Purpose of the Study:

  • To investigate the impact of accelerated mRNA degradation on the galactose utilization network in yeast.
  • To elucidate the mechanism behind the growth advantage observed upon glucose addition.
  • To understand the role of translational competition and spatial regulation in cellular adaptation.

Main Methods:

  • Analysis of GAL1 transcript degradation kinetics in response to glucose.
  • Assessment of translational competition between GAL1 and CLN3 transcripts.
  • Investigation of spatial transcript localization for GAL1 and CLN3.

Main Results:

  • Glucose-induced degradation of GAL1 transcripts confers a transient growth advantage.
  • This advantage stems from reduced translational competition with CLN3 transcripts.
  • Spatial regulation of GAL1 and CLN3 transcripts maintains growth during glucose fluctuations.

Conclusions:

  • Posttranscriptional control via translational bottlenecks optimizes cellular response to carbon source changes.
  • Enhanced mRNA degradation is a key mechanism for rapid adaptation in yeast.
  • Spatial transcript organization plays a critical role in maintaining cellular homeostasis under dynamic conditions.