Identification of vib-1, a locus involved in vegetative incompatibility mediated by het-c in Neurospora crassa.
A non-self-recognition system called vegetative incompatibility is ubiquitous in filamentous fungi and is genetically regulated by het loci. Different fungal individuals are unable to form viable heterokaryons if they differ in allelic specificity at a het locus. To identify components of vegetative incompatibility mediated by allelic differences at the het-c locus of Neurospora crassa, we isolated mutants that suppressed phenotypic aspects of het-c vegetative incompatibility. Three deletion mutants were identified; the deletions overlapped each other in an ORF named vib-1 (vegetative incompatibility blocked). Mutations in vib-1 fully relieved growth inhibition and repression of conidiation conferred by het-c vegetative incompatibility and significantly reduced hyphal compartmentation and death rates. The vib-1 mutants displayed a profuse conidiation pattern, suggesting that VIB-1 is a regulator of conidiation. VIB-1 shares a region of similarity to PHOG, a possible phosphate nonrepressible acid phosphatase in Aspergillus nidulans. Native gel analysis of wild-type strains and vib-1 mutants indicated that vib-1 is not the structural gene for nonrepressible acid phosphatase, but rather may regulate nonrepressible acid phosphatase activity.
Xiang
Qijun
Q
Department of Plant and Microbial Biology, University of California, Berkeley, California 94720-3102, USA.
Glass
N Louise
NL
D000135:Acid Phosphatase / Q000378:metabolism; D000595:Amino Acid Sequence; D001483:Base Sequence; D004271:DNA, Fungal; D004591:Electrophoresis, Polyacrylamide Gel; D005656:Fungal Proteins / Q000235:genetics*; D005800:Genes, Fungal; D016153:Genes, Suppressor; D005816:Genetic Complementation Test; D008969:Molecular Sequence Data; D009492:Neurospora crassa / Q000235:genetics*; D016366:Open Reading Frames; D017384:Sequence Deletion; D017386:Sequence Homology, Amino Acid
D004271:DNA, Fungal; D005656:Fungal Proteins; D000135:Acid Phosphatase