title: Mating systems in ascomycetes: a romp in the sac.
abstract: The ascomycetous fungi choose between sexual and asexual reproduction; it is only when appropriately stressed that most resort to sexual development. Many of the proteins known to regulate development in animals (homeodomain proteins, HMG-box proteins) are also central to the control of sexual differentiation in the ascomycetes. Most ascomycete mating-type loci are structurally complex idiomorphs (large regions of nonhomologous DNA), in that they encode multiple products of probable independent evolutionary origin. The products of the mating-type genes are the master regulators of sexual development; we are just beginning our search for factors involved in the signal transduction pathway downstream from these master regulators.
authors.affiliation: Department of Biology, University of New Mexico, Albuquerque 87131, USA. manelson@triton.unm.edu
authors.forename: M A
authors.initials: MA
authors.lastname: Nelson
mesh_terms: D001203:Ascomycota / Q000235:genetics* / Q000502:physiology; D005800:Genes, Fungal / Q000502:physiology*; D049770:Genes, Mating Type, Fungal; D012098:Reproduction; D012733:Sex Differentiation / Q000235:genetics