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Genetics

Title:		Molecular analysis of the Coprinus cinereus mating type A factor demonstrates an unexpectedly complex structure
Author(s):		May G; Le Chevanton L; Pukkila PJ;
Address:		"Department of Biology and Curriculum in Genetics, University of North Carolina, Chapel Hill 27599-3280"
Journal Title:		Genetics
Year:		1991
Volume:		128
Issue:		3
Page Number:		529 - 538
DOI:		10.1093/genetics/128.3.529
ISSN/ISBN:		0016-6731 (Print) 0016-6731 (Linking)
Abstract:		"We report here the molecular cloning of the A43 mating type factor from Coprinus cinereus, a basidiomycetous fungus. Our molecular analyses revealed an unexpected source of variation in the A factor. Though genetic studies have demonstrated that A has two subunits, alpha and beta, we located three nonoverlapping fragments in the A43 region that have A factor function following DNA-mediated transformation. The three fragments demonstrate no similarity to one another as judged by restriction enzyme maps and by hybridization on Southern blots. We conclude that the A43 factor is composed of at least three subunits. When strains carrying different A factors are examined by hybridization to the cloned subunits, extensive polymorphism is seen. Both intensity of hybridization and restriction fragment lengths vary between strains. Some strains fail to show any hybridization to a probe. In contrast, other strains from widely separated geographic locations apparently share very similar subunits. From comparative restriction enzyme mapping of A43 and a mutated A43 factor, we inferred that a 12-kb deletion in the A factor was responsible for the constitutive, dominant phenotype of the mutated A factor. The results of transformation experiments support an activator model for the activity of the A factor in regulating the A pathway"
Keywords:		"Biological Evolution Blotting, Southern Cloning, Molecular Coprinus/*genetics Gene Expression Regulation, Fungal/genetics Genes, Fungal/*genetics *Genes, Mating Type, Fungal Genetic Variation Mating Factor Mutation/genetics Peptides/*genetics Polymorphism;"
Notes:		"MedlineMay, G Le Chevanton, L Pukkila, P J eng F32 GM12130-03/GM/NIGMS NIH HHS/ Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, P.H.S. 1991/07/01 Genetics. 1991 Jul; 128(3):529-38. doi: 10.1093/genetics/128.3.529"