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A nonself recognition gene complex in Neurospora crassa.

Cristina O Micali1, Myron L Smith

  • 1Biology Department, Carleton University, Ottawa, Ontario K1S 5B6, Canada.

Genetics
|June 6, 2006
PubMed
Summary

Nonself recognition in fungi involves the het-6 locus, where two genes, het-6 and un-24, control cell fusion. New allelic combinations reveal distinct recognition capabilities and evolutionary insights into this fungal incompatibility system.

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Area of Science:

  • Mycology
  • Genetics
  • Molecular Biology

Background:

  • Nonself recognition in fungi regulates cell fusion (heterokaryosis).
  • The het-6 locus in *N. crassa* controls heterokaryon incompatibility.
  • In Oak Ridge (OR) strains, incompatibility involves contiguous genes het-6 and un-24.

Purpose of the Study:

  • Investigate weak incompatibility activities of *N. crassa* het-6 and un-24 alleles.
  • Synthesize novel allelic combinations to understand their interaction and evolutionary significance.
  • Analyze the genetic architecture of the het-6 region in different *N. crassa* strains.

Main Methods:

  • Transformation of *N. crassa* strains with specific alleles.
  • Phenotypic analysis of resulting strains (growth, incompatibility).
  • Comparative genomic analysis of het-6 regions between OR and Panama (PA) strains.

Main Results:

  • *N. crassa* alleles un-24PA and het-6PA exhibit weak incompatibility individually in OR strains.
  • Combined alleles show additive strong incompatibility.
  • Synthesized strains (un-24PA het-6OR, un-24OR het-6PA) display normal growth but altered recognition.
  • A paracentric inversion was identified in the het-6 region, differentiating OR and PA strains.

Conclusions:

  • The het-6 locus exhibits complex interactions between alleles, influencing fungal nonself recognition.
  • Allelic variation and chromosomal rearrangements (inversions) contribute to the evolution of incompatibility genes.
  • Understanding these mechanisms provides insights into fungal population genetics and evolution.

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