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• W2171714881 endingPage "e15273" @default.
• W2171714881 startingPage "e15273" @default.
• W2171714881 abstract "The Rhizopus oryzae species complex is a group of zygomycete fungi that are common, cosmopolitan saprotrophs. Some strains are used beneficially for production of Asian fermented foods but they can also act as opportunistic human pathogens. Although R. oryzae reportedly has a heterothallic (+/-) mating system, most strains have not been observed to undergo sexual reproduction and the genetic structure of its mating locus has not been characterized. Here we report on the mating behavior and genetic structure of the mating locus for 54 isolates of the R. oryzae complex. All 54 strains have a mating locus similar in overall organization to Phycomyces blakesleeanus and Mucor circinelloides (Mucoromycotina, Zygomycota). In all of these fungi, the minus (-) allele features the SexM high mobility group (HMG) gene flanked by an RNA helicase gene and a TP transporter gene (TPT). Within the R. oryzae complex, the plus (+) mating allele includes an inserted region that codes for a BTB/POZ domain gene and the SexP HMG gene. Phylogenetic analyses of multiple genes, including the mating loci (HMG, TPT, RNA helicase), ITS1-5.8S-ITS2 rDNA, RPB2, and LDH genes, identified two distinct groups of strains. These correspond to previously described sibling species R. oryzae sensu stricto and R. delemar. Within each species, discordant gene phylogenies among multiple loci suggest an outcrossing population structure. The hypothesis of random-mating is also supported by a 50:50 ratio of plus and minus mating types in both cryptic species. When crossed with tester strains of the opposite mating type, most isolates of R. delemar failed to produce zygospores, while isolates of R. oryzae produced sterile zygospores. In spite of the reluctance of most strains to mate in vitro, the conserved sex locus structure and evidence for outcrossing suggest that a normal sexual cycle occurs in both species." @default.
• W2171714881 created "2016-06-24" @default.
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• W2171714881 date "2010-12-09" @default.
• W2171714881 modified "2023-10-15" @default.
• W2171714881 title "Structure, Function, and Phylogeny of the Mating Locus in the Rhizopus oryzae Complex" @default.
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• W2171714881 doi "https://doi.org/10.1371/journal.pone.0015273" @default.
• W2171714881 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3000332" @default.
• W2171714881 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/21151560" @default.
• W2171714881 hasPublicationYear "2010" @default.
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