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Related Concept Videos

What is Gene Expression?01:42

What is Gene Expression?

Overview
Gene expression is the process in which DNA directs the synthesis of functional products, that is, proteins. Cells can regulate gene expression at various stages. It allows organisms to generate different cell types and enables cells to adapt to internal and external factors.
Genetic Information Flows from DNA to RNA to Protein
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These groups modify specific amino acids in a protein.
What is Gene Expression?01:36

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A gene is a stretch of DNA that serves as the blueprint for functional RNAs and proteins. Since DNA is comprised  of nucleotides and proteins are comprised of amino acids, a mediator is required to convert the information encoded in DNA into proteins. This mediator is the messenger RNA (mRNA). mRNA copies the blueprint from DNA by a process called transcription. In eukaryotes, transcription occurs in the nucleus by complementary base-pairing with the DNA template. The mRNA is then processed and...
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Epigenetic Regulation

Epigenetic changes alter the physical structure of the DNA without changing the genetic sequence and often regulate whether genes are turned on or off. This regulation ensures that each cell produces only proteins necessary for its function. For example, proteins that promote bone growth are not produced in muscle cells. Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
X-chromosome...
Mutations in Microorganisms01:18

Mutations in Microorganisms

Mutations are heritable changes in an organism’s genome involving alterations in the base sequence of DNA or RNA. These changes can influence cellular processes and phenotypic traits, potentially transforming the unaltered wild type into a mutant form. Such changes, termed forward mutations, are pivotal in shaping the genetic diversity of organisms.RNA viruses exhibit the highest mutation rates due to the absence of robust proofreading mechanisms during genome replication. In contrast,...

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Updated: Jun 28, 2026

Mapping Bacterial Functional Networks and Pathways in Escherichia Coli using Synthetic Genetic Arrays
14:06

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Published on: November 12, 2012

The modifiers that cause changes in gene essentiality.

Amandine Batté1, Núria Bosch-Guiteras1, Carles Pons2

  • 1Center for Integrative Genomics, University of Lausanne, CH-1015 Lausanne, Switzerland.

Cell Systems
|March 3, 2026
PubMed
Summary
This summary is machine-generated.

Genetic background significantly impacts gene essentiality in yeast. Researchers found variants in modifier genes explain why some essential genes are not vital in diverse natural yeast strains, revealing evolutionary paths.

Keywords:
MKT1MSN5RAD53bypass suppressioncompensatory evolutioncontext-dependencygene essentialitygenetic interactionsgenetic suppressionyeast

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Area of Science:

  • Genetics
  • Evolutionary Biology
  • Yeast Biology

Background:

  • Mutant phenotypes exhibit variability due to genetic background effects.
  • Understanding these effects is crucial for interpreting genotype-phenotype relationships, including those in human disease.

Purpose of the Study:

  • To investigate the causes of genetic background effects on gene essentiality.
  • To identify genetic variants responsible for differences in gene essentiality across diverse yeast strains.

Main Methods:

  • Studied gene essentiality across 18 genetically diverse natural yeast strains.
  • Identified genes essential in a reference strain but not in others.
  • Mapped and validated genetic variants causing differential gene essentiality.

Main Results:

  • Identified 39 genes with context-dependent essentiality.
  • Found that variants in single modifier genes often explain these differences.
  • Observed that affected genes can indirectly compensate for the loss of essential genes.

Conclusions:

  • Changes in gene essentiality are prevalent in natural populations.
  • Genetic background effects are driven by variants in modifier genes.
  • This work provides insights into natural evolutionary trajectories and genotype-phenotype relationships.