title: Molecular variability of Pseudallescheria boydii, a neurotropic opportunist.
abstract: The sequences of the internal transcribed spacer (ITS) ribosomal DNA (rDNA) domain data obtained by restriction fragment length polymorphism analysis with 18S rDNA and fingerprinting (M13) for clinical and environmental strains of Pseudallescheria boydii (anamorph, Scedosporium apiospermum) were compared to those for related species of Pseudallescheria, Petriella, and Scedosporium. The infraspecific variability of P. boydii was considerable. There were five different lengths in the 18S rDNAs within P. boydii due to the occurrence of introns. In several cases, strains isolated from a single pond or ditch proved to be genetically very different. Nevertheless, some lineages had a regional distribution. The variability found is unlikely to be explained by meiotic recombination alone. Pseudallescheria fusoidea, Pseudallescheria ellipsoidea, and Pseudallescheria angusta were found to be synonyms for P. boydii. Scedosporium prolificans was found amid Petriella species in the ITS tree and showed no infraspecific variability. The type strain of Rhinocladium lesnei proved to be identical to Graphium putredinis. Acladium castellanii, which is morphologically reminiscent of S. apiospermum, was also found to be a separate species, but with an unknown affiliation.
authors.affiliation: Centraalbureau voor Schimmelcultures, Baarn, The Netherlands.
authors.forename: J
authors.initials: J
authors.lastname: Rainer
authors.forename: G S
authors.initials: GS
authors.lastname: de Hoog
authors.forename: M
authors.initials: M
authors.lastname: Wedde
authors.forename: Y
authors.initials: Y
authors.lastname: Gräser
authors.forename: S
authors.initials: S
authors.lastname: Gilges
mesh_terms: D000818:Animals; D020314:Central Nervous System Fungal Infections / Q000382:microbiology*; D002648:Child; D016172:DNA Fingerprinting / Q000379:methods; D004271:DNA, Fungal / Q000235:genetics; D004275:DNA, Ribosomal / Q000032:analysis / Q000235:genetics; D004783:Environmental Microbiology; D014644:Genetic Variation; D006801:Humans; D008297:Male; D008271:Mycetoma / Q000382:microbiology*; D009894:Opportunistic Infections / Q000382:microbiology*; D010802:Phylogeny; D012150:Polymorphism, Restriction Fragment Length; D011541:Pseudallescheria / Q000145:classification* / Q000235:genetics*; D012337:RNA, Ribosomal, 18S / Q000235:genetics; D015183:Restriction Mapping; D017422:Sequence Analysis, DNA
chemical_list: D004271:DNA, Fungal; D004275:DNA, Ribosomal; D012337:RNA, Ribosomal, 18S