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Related Experiment Videos

Gestational drive and the green-bearded placenta

D Haig1

  • 1Museum of Comparative Zoology, Harvard University, Cambridge, MA 02138, USA. dhaig@oeb.harvard.edu

Proceedings of the National Academy of Sciences of the United States of America
|June 25, 1996
PubMed
Summary

Green-beard genes, previously dismissed, can arise from simple recognition mechanisms at the maternal-fetal interface. These genetic self-recognition effects can drive intragenomic conflict.

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Area of Science:

  • Evolutionary genetics
  • Gene regulation
  • Reproductive biology

Background:

  • The concept of "green beard" genes, which recognize and benefit copies of themselves in other individuals, has been considered largely theoretical.
  • Previous skepticism focused on the perceived complexity of recognition and behavioral response mechanisms required for such genes.
  • Viviparous organisms present a unique biological context with potential for simpler genetic self-recognition pathways.

Purpose of the Study:

  • To re-evaluate the plausibility of green-beard gene effects by exploring simpler recognition mechanisms.
  • To identify biological contexts where genetic self-recognition could naturally occur.
  • To explore the implications of green-beard effects for intragenomic conflict and evolution.

Main Methods:

  • Conceptual analysis of gene interactions at the maternal-fetal interface.
  • Examination of existing biological mechanisms, such as homophilic cell adhesion molecules.
  • Exploration of genetic epistasis between linked loci in mother and fetus.

Main Results:

  • Simple recognition mechanisms for green-beard genes exist, particularly at the maternal-fetal interface.
  • Homophilic cell adhesion molecules exemplify how genes can recognize themselves via cell-surface interactions.
  • Gene coalitions and epistasis between linked loci can also facilitate green-beard effects, demonstrating "self-recognition".

Conclusions:

  • Green-beard effects are more plausible than previously assumed, enabled by simple genetic and molecular mechanisms.
  • These effects can manifest through single genes or linked gene coalitions, particularly in viviparous reproduction.
  • Green-beard gene effects share similarities with meiotic drive and represent a potential source of intragenomic conflict.

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