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Related Concept Videos

Epistasis01:39

Epistasis

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In addition to multiple alleles at the same locus influencing traits, numerous genes or alleles at different locations may interact and influence phenotypes in a phenomenon called epistasis. For example, rabbit fur can be black or brown depending on whether the animal is homozygous dominant or heterozygous at a TYRP1 locus. However, if the rabbit is also homozygous recessive at a locus on the tyrosinase gene (TYR), it will have an unshaded coat that appears white, regardless of its TYRP1...
47.1K

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Author Spotlight: Enhanced Isolation of Interaction-Null Mutants in Yeast
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Mapping mitonuclear epistasis using a novel recombinant yeast population.

Tuc H M Nguyen1,2, Austen Tinz-Burdick1, Meghan Lenhardt1

  • 1Department of Biological Sciences, Binghamton University, Binghamton, New York, United States of America.

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|March 29, 2023
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Summary

Researchers developed a new yeast population (Mitonuclear Recombinant Collection) to map genetic factors influencing mitochondrial DNA stability. This tool helps understand how nuclear and mitochondrial genes interact to affect traits.

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Area of Science:

  • Genetics
  • Molecular Biology
  • Yeast Biology

Background:

  • Genetic variation in mitochondrial and nuclear genomes impacts complex traits through mitonuclear interactions.
  • Identifying specific mitonuclear loci involved in these interactions has been challenging.
  • Mitochondrial DNA (mtDNA) loss, leading to the petite phenotype in yeast, is influenced by nuclear DNA, mtDNA, and their interactions.

Purpose of the Study:

  • To introduce a novel yeast resource, the Mitonuclear Recombinant Collection (MNRC), for detecting mitonuclear loci.
  • To map nuclear and mitonuclear genetic factors contributing to mitochondrial DNA stability.
  • To investigate the relationship between growth rate, mtDNA stability, and fitness trade-offs.

Main Methods:

  • Creation of an advanced intercrossed yeast population (MNRC).
  • Genome-wide association study integrating mitonuclear epistasis to map loci affecting mtDNA stability.
  • Analysis of correlations between growth rates, petite frequencies, and mtDNA stability.

Main Results:

  • Identified mitonuclear loci involved in mitotic growth and response to retrograde mitochondrial signals.
  • Identified nuclear loci primarily involved in genome replication affecting mtDNA stability.
  • Observed a positive correlation between growth rates and petite frequencies, indicating a fitness trade-off.
  • Found mtDNA stability correlated with a mobile mitochondrial GC-cluster and evidence for rapid selection on nuclear alleles.

Conclusions:

  • The MNRC is a powerful tool for dissecting complex genotype-phenotype relationships driven by mitonuclear interactions.
  • Findings shed light on the genetic basis of mtDNA stability and its evolutionary implications in yeast.
  • Understanding these interactions is crucial for comprehending coevolutionary trajectories and phenotypic variation.