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Evolution: an ecological context for C. elegans.

David H A Fitch1

  • 1Department of Biology, New York University, New York 10003, USA.

Current Biology : CB
|September 6, 2005
PubMed
Summary
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Natural populations of Caenorhabditis elegans show surprising genetic divergence between neighboring groups. This variation is likely driven by population bottlenecks and dispersal via the dauer larva stage, with rare outcrossing also contributing.

Area of Science:

  • Evolutionary biology
  • Population genetics
  • Genomics

Background:

  • Caenorhabditis elegans exhibits low global genetic diversity.
  • Distinct genetic profiles exist even between geographically close natural populations.

Purpose of the Study:

  • To investigate the genetic differentiation patterns in natural Caenorhabditis elegans populations.
  • To understand the mechanisms driving genetic distinctness in C. elegans.

Main Methods:

  • Analysis of genetic variation across natural Caenorhabditis elegans populations.
  • Modeling of population dynamics including dispersal and reproduction.

Main Results:

  • Neighboring C. elegans populations can be as genetically distinct as continental strains.

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  • Transient population bottlenecks and dispersal as dauer larvae are probable causes.
  • Selfing is the predominant reproductive mode, but rare outcrossing contributes.

    • Conclusions:

    • Geographic proximity does not equate to genetic similarity in C. elegans.
    • Dispersal and reproductive strategies significantly shape population genetic structure.