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Compensatory vs. pseudocompensatory evolution in molecular and developmental interactions.

Eric S Haag1

  • 1Department of Biology, University of Maryland, College Park, MD 20742, USA. ehaag@umd.edu

Genetica
|November 17, 2006
PubMed
Summary
This summary is machine-generated.

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Compensatory evolution, where genetic changes fix incompatibilities, may often be pseudocompensatory. This occurs via neutral intermediates, allowing evolution without deleterious mutations, and can accelerate the evolution of genetic incompatibilities.

Area of Science:

  • Evolutionary biology
  • Molecular evolution
  • Developmental biology

Background:

  • Accumulation of incompatibilities drives evolution of molecules, developmental circuits, and species.
  • Compensatory coevolution is required when specific component interactions are necessary.
  • Theoretical models predict compensatory evolution is rare due to deleterious intermediates, contrasting with empirical data.

Purpose of the Study:

  • To resolve the paradox between theoretical predictions and empirical observations of compensatory evolution.
  • To propose a general mechanism for how seemingly compensatory evolution occurs.
  • To explore the role of neutral intermediates in evolutionary processes.

Main Methods:

  • Theoretical modeling of evolutionary pathways.

Related Experiment Videos

  • Analysis of empirical data on molecular and developmental interactions.
  • Review of existing literature on compensatory and pseudocompensatory evolution.

    • Main Results:

    • Neutral or nearly neutral intermediates with informational redundancy provide a path for evolution between incompatible states.
    • These intermediates allow for the evolution of incompatible endpoints without requiring compensation for deleterious mutations.
    • Pseudocompensation can accelerate the evolution of intergenic incompatibility, particularly under adaptive pressure or stabilizing selection.

    Conclusions:

    • Apparent compensatory evolution is often pseudocompensatory, facilitated by neutral intermediates.
    • Pseudocompensation plays a significant role in the evolution of molecular structures, protein interactions, and developmental pathways.
    • Future research should compare intra- and intergenic interactions in closely related species to further elucidate these mechanisms.