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Associated Chromosome Trap for Identifying Long-range DNA Interactions
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Interactions between chromosomal and nonchromosomal elements reveal missing heritability.

Matthew D Edwards1, Anna Symbor-Nagrabska2, Lindsey Dollard2

  • 1Computer Science and Artificial Intelligence Laboratory, Massachusetts Institute of Technology, Cambridge, MA 02139;

Proceedings of the National Academy of Sciences of the United States of America
|May 15, 2014
PubMed
Summary
This summary is machine-generated.

This study introduces a yeast system to measure nonchromosomal genetic contributions to heritability. Results show mitochondrial DNA and viruses impact yeast growth, explaining significant heritability.

Keywords:
extrachromosomalgenetic interactionsnonlinear model

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Area of Science:

  • Genetics
  • Molecular Biology
  • Yeast Biology

Background:

  • Heritability studies are often confounded by uncontrolled nonchromosomal factors.
  • Accurately measuring nonchromosomal genetic contributions to traits is challenging.

Purpose of the Study:

  • To develop a yeast system for controlling both chromosomal and nonchromosomal genetic information.
  • To investigate the influence of nonchromosomal elements on the phenotype of chromosomal variants.

Main Methods:

  • Designed a unique yeast system to isolate and control chromosomal and cytoplasmic genetic information.
  • Measured the phenotype of single chromosomal polymorphisms under varying cytoplasmic conditions.

Main Results:

  • Demonstrated that mitochondrial genome source and dsRNA virus presence/absence affect yeast growth phenotypes.
  • Showed that nonchromosomal information significantly contributes to the heritability of growth traits.
  • Nonadditive interactions between chromosomal and nonchromosomal information were observed.

Conclusions:

  • Emphasized the necessity of including all heritable information sources in genetic studies.
  • Proposed this approach as a method to uncover additional missing heritability.
  • Highlighted the role of nonchromosomal factors in complex trait inheritance.