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Related Concept Videos

Protein Networks02:26

Protein Networks

An organism can have thousands of different proteins, and these proteins must cooperate to ensure the health of an organism. Proteins bind to other proteins and form complexes to carry out their functions. Many proteins interact with multiple other proteins creating a complex network of protein interactions.
These interactions can be represented through maps depicting protein-protein interaction networks, represented as nodes and edges. Nodes are circles that are representative of a protein,...
Protein Networks02:26

Protein Networks

An organism can have thousands of different proteins, and these proteins must cooperate to ensure the health of an organism. Proteins bind to other proteins and form complexes to carry out their functions. Many proteins interact with multiple other proteins creating a complex network of protein interactions.
These interactions can be represented through maps depicting protein-protein interaction networks, represented as nodes and edges. Nodes are circles that are representative of a protein,...
Epistasis Analysis01:09

Epistasis Analysis

Although Mendel chose seven unrelated traits in peas to study gene segregation, most traits involve multiple gene interactions that create a spectrum of phenotypes. When the interaction of various genes or alleles at different locations influences a phenotype, this is called epistasis. Epistasis often involves one gene masking or interfering with the expression of another (antagonistic epistasis). Epistasis often occurs when different genes are part of the same biochemical pathway. The...
Protein-protein Interfaces02:04

Protein-protein Interfaces

Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a polypeptide...
Genetic Screens02:46

Genetic Screens

Genetic screens are tools used to identify genes and mutations responsible for phenotypes of interest. Genetic screens help identify individuals or a group of people at risk of developing  genetic diseases and help them with early intervention, targeted therapy, and reproductive options.
Forward genetic screens
Forward or “classical” genetic screens involve creating random mutations in an organism’s DNA using radiation, mutagens, or insertion of additional bases, which result in visible changes...

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Related Experiment Video

Updated: Jun 20, 2026

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

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

Published on: November 12, 2012

Systematic mapping of genetic interaction networks.

Scott J Dixon1, Michael Costanzo, Anastasia Baryshnikova

  • 1Banting and Best Department of Medical Research, Terrence Donnelly Center for Cellular and Biomolecular Research, University of Toronto, Toronto, Ontario M5S 1A7, Canada.

Annual Review of Genetics
|August 29, 2009
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Summary

Systematic genetic screens reveal how gene interactions shape traits across diverse organisms, from yeast to humans. This mapping of genetic networks enhances our understanding of genotype-phenotype relationships in biology.

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Last Updated: Jun 20, 2026

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Published on: March 3, 2015

Area of Science:

  • Genetics
  • Systems Biology
  • Molecular Biology

Background:

  • Genetic interactions are crucial for understanding phenotypes.
  • Systematic genetic screens are powerful tools for dissecting biological networks.
  • Previous studies have mapped genetic interactions in yeast (Saccharomyces cerevisiae).

Purpose of the Study:

  • To extend systematic genetic interaction mapping to other organisms.
  • To enable comparative analyses of genetic interaction networks.
  • To deepen the understanding of genotype-phenotype relationships.

Main Methods:

  • Utilizing libraries of genetic tools to perturb biological systems.
  • Conducting systematic genetic screens in various model organisms.
  • Extending techniques for genetic interaction mapping.

Main Results:

  • Thousands of genetic interactions identified in Saccharomyces cerevisiae.
  • Genetic interaction mapping extended to bacteria (Escherichia coli) and yeast (Schizosaccharomyces pombe).
  • Application of screens in metazoan models (Caenorhabditis elegans, Drosophila melanogaster, mammalian models) for pathway analysis.

Conclusions:

  • Comparative investigations of interaction networks are now possible across diverse species.
  • Understanding of metazoan-specific signaling pathways is improving.
  • Emerging knowledge of genetic wiring diagrams provides new insights into genotype-phenotype relationships.