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Related Concept Videos

In-vitro Mutagenesis01:16

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Unlike mitosis, meiosis aims for genetic diversity in its creation of haploid gametes. Dividing germ cells first begin this process in prophase I, where each chromosome—replicated in S phase—is now composed of two sister chromatids (identical copies) joined centrally.
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Related Experiment Video

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Conditional Genetic Transsynaptic Tracing in the Embryonic Mouse Brain
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Backcrossing to Generate a Congenic Mouse Strain.

Virginia E Papaioannou1, Richard R Behringer2

  • 1Department of Genetics and Development, Columbia University Medical Center, New York, New York 10032, USA vep1@columbia.edu.

Cold Spring Harbor Protocols
|November 6, 2023
PubMed
Summary

Transferring mutations to new genetic backgrounds is crucial for understanding gene function. This protocol details using backcrossing to create congenic strains for accurate mutant phenotype analysis.

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Area of Science:

  • Genetics
  • Molecular Biology
  • Genomics

Background:

  • Genetic background significantly influences observed mutant phenotypes.
  • Understanding gene function often requires analyzing mutations across different genetic backgrounds.
  • Existing mutations may need to be transferred to new strains for comprehensive study.

Purpose of the Study:

  • To provide a detailed protocol for transferring mutations between genetic backgrounds.
  • To enable the creation of congenic strains for precise genetic analysis.
  • To facilitate the study of gene function by controlling genetic background effects.

Main Methods:

  • Utilizes repeated backcrossing (introgression) to transfer a mutation.
  • Involves crossing a mutant donor strain with a recipient strain.
  • Selects for offspring inheriting the mutation while minimizing donor genome contribution.

Main Results:

  • Successfully generates congenic strains with the desired mutation.
  • Ensures the majority of the genome originates from the recipient strain.
  • Isolates the effect of the mutation from other genetic variations.

Conclusions:

  • Congenic strains are essential tools for dissecting gene function.
  • This protocol offers a straightforward method for creating congenic strains.
  • Accurate analysis of mutant phenotypes is achievable through genetic background control.