Genes encoding a striatin-like protein (ham-3) and a forkhead associated protein (ham-4) are required for hyphal fusion in Neurospora crassa.
Fungal Genet Biol
; 47(10): 855-68, 2010 Oct.
Article
in En
| MEDLINE
| ID: mdl-20601042
ABSTRACT
Cell-cell fusion during fertilization and between somatic cells is an integral process in eukaryotic development. In Neurospora crassa, the hyphal anastomosis mutant, ham-2, fails to undergo somatic fusion. In both humans and Saccharomyces cerevisiae, homologs of ham-2 are found in protein complexes that include homologs to a striatin-like protein and a forkhead-associated (FHA) protein. We identified a striatin (ham-3) gene and a FHA domain (ham-4) gene in N. crassa; strains containing mutations in ham-3 and ham-4 show severe somatic fusion defects. However, ham-3 and ham-4 mutants undergo mating-cell fusion, indicating functional differences in somatic versus sexual fusion events. The ham-2 and ham-3 mutants are female sterile, while ham-4 mutants are fertile. Homozygous crosses of ham-2, ham-3 and ham-4 mutants show aberrant meiosis and abnormally shaped ascospores. These data indicate that, similar to humans, the HAM proteins may form different signaling complexes that are important during both vegetative and sexual development in N. crassa.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Calmodulin-Binding Proteins
/
Forkhead Transcription Factors
/
Membrane Fusion
/
Neurospora crassa
Type of study:
Prognostic_studies
/
Risk_factors_studies
Language:
En
Journal:
Fungal Genet Biol
Journal subject:
GENETICA
/
MICROBIOLOGIA
Year:
2010
Document type:
Article
Affiliation country: