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Related Concept Videos

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Evolution of New Traits in Microbes

Microorganisms evolve rapidly due to their large population sizes and short generation times, often exhibiting measurable changes within days under laboratory conditions. Natural selection acts on standing genetic variation, enabling the retention and amplification of beneficial traits that confer fitness advantages in changing environments.Adaptive Pigment Regulation in RhodobacterIn Rhodobacter, a genus of purple non-sulfur bacteria, light-harvesting pigments such as bacteriochlorophyll and...
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Selection at linked sites shapes heritable phenotypic variation in C. elegans.

Matthew V Rockman1, Sonja S Skrovanek, Leonid Kruglyak

  • 1Department of Biology and Center for Genomics and Systems Biology, New York University, 100 Washington Square East, New York, NY 10003, USA. mrockman@nyu.edu

Science (New York, N.Y.)
|October 16, 2010
PubMed
Summary

Genetic variation arises from mutation and is shaped by genetic drift and natural selection. In Caenorhabditis elegans, trait variation is influenced more by regional effective population size than by trait-specific factors.

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Area of Science:

  • Genetics
  • Evolutionary Biology
  • Molecular Biology

Background:

  • Heritable variation is generated by mutation, which is then acted upon by genetic drift and natural selection.
  • Classical quantitative genetic models assume drift is uniform across traits, while mutation and selection are trait-specific.

Purpose of the Study:

  • To investigate the factors influencing the distribution of quantitative trait loci (QTLs) for transcript abundance in Caenorhabditis elegans.
  • To determine whether trait-specific mutation/selection or trait-independent factors better explain observed QTL patterns.

Main Methods:

  • Identified thousands of QTLs associated with transcript abundance traits in a cross between two Caenorhabditis elegans strains.
  • Analyzed the distribution patterns of these QTLs in relation to mutation, selection, and genetic drift.
  • Compared the explanatory power of trait-specific versus trait-independent models for QTL distribution.

Main Results:

  • While trait-specific mutation and selection contributed to QTL distribution patterns, they were not the primary drivers.
  • Trait-independent variation in the intensity of selection on linked sites provided a better explanation for the observed QTL distribution.
  • Genomic regions with different effective population sizes significantly influenced trait variation in C. elegans.

Conclusions:

  • The variation observed across different traits in C. elegans is largely determined by the effective population sizes of the genomic regions harboring their underlying loci.
  • Trait attributes themselves are less influential in determining variation levels compared to regional effective population sizes.
  • This finding refines our understanding of how genetic drift and natural selection interact to shape phenotypic variation.