title: Presence and expression of the mating type locus in Paracoccidioides brasiliensis isolates.
abstract: Paracoccidioides brasiliensis has been classified in the phylum Ascomycota, order Onygenales, family Ajellomycetaceae, even in the absence of a known sexual cycle or mating system. The objective of this work was to determine the presence of the mating type locus in 71 P. brasiliensis isolates from various sources. A PCR assay using specific primers for the MAT 1 gene was developed and applied for the detection of such genes. Two heterothallic groups (MAT1-1 or MAT1-2) were recognized and, in some isolates, gene expression was confirmed indicating the existence of a basal gene expression. The distribution of two mating type loci in the studied population suggested that sexual reproduction might occur in P. brasiliensis. This finding points towards the possibility of applying a more precise definition of the concept of biological species to P. brasiliensis. Further studies should be conducted to confirm the sexual capacity of this fungus and its implications among phylogenetic species and geographical distribution.
authors.affiliation: Unidad de Biología Celular y Molecular, Corporación para Investigaciones Biológicas (CIB), Medellín, Colombia.
authors.forename: I
authors.initials: I
authors.lastname: Torres
authors.forename: A M
authors.initials: AM
authors.lastname: García
authors.forename: O
authors.initials: O
authors.lastname: Hernández
authors.forename: A
authors.initials: A
authors.lastname: González
authors.forename: J G
authors.initials: JG
authors.lastname: McEwen
authors.forename: A
authors.initials: A
authors.lastname: Restrepo
authors.forename: M
authors.initials: M
authors.lastname: Arango
mesh_terms: D017931:DNA Primers / Q000235:genetics; D004271:DNA, Fungal / Q000737:chemistry / Q000235:genetics; D015870:Gene Expression; D049770:Genes, Mating Type, Fungal / Q000235:genetics*; D008969:Molecular Sequence Data; D010228:Paracoccidioides / Q000235:genetics* / Q000502:physiology; D016133:Polymerase Chain Reaction / Q000379:methods; D011995:Recombination, Genetic; D017422:Sequence Analysis, DNA
chemical_list: D017931:DNA Primers; D004271:DNA, Fungal