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Comparison of 5.8S ribosomal DNA sequences among the basidiomycetous yeast genera Cystofilobasidium, Filobasidium and Filobasidiella.

Publication ,  Journal Article
Mitchell, TG; White, TJ; Taylor, JW
Published in: J Med Vet Mycol
1992

Nucleotide sequences obtained from regions of the ribosomal DNA repeat were compared by phylogenetic methods and combined with a statistical evaluation to clarify the relationships among the genera Cystofilobasidium, Filobasidium (F.) and Filobasidiella (Fl.), to assess the affinity of Filobasidiella neoformans and Filobasidiella depauperata, and to compare the varieties of Fl. neoformans. With appropriate primers, the nuclear 18S, 5.8S and internal transcribed spacer (ITS) regions of the ribosomal RNA genes (rDNA) of 10 strains were amplified with the polymerase chain reaction. The resulting DNA products were compared by digestion with endonucleases and analysis of restriction fragments. Single strands of the 5.8S rDNA and ITS regions were subsequently sequenced by the dideoxy method. Statistical support for the phylogeny inferred from parsimony analysis of aligned 5.8S rDNA sequences was determined by bootstrapping. There were no nucleotide substitutions in this region, nor in the ITS, among strains of Fl. neoformans that differ in variety and serotype. There was strong support for retaining Fl. depauperata and Fl. neoformans in the same genus, but nucleotide substitutions can be used to distinguish the two species. There was no support for combining the genera Filobasidium, Filobasidiella or Cystofilobasidium.

Duke Scholars

Published In

J Med Vet Mycol

ISSN

0268-1218

Publication Date

1992

Volume

30

Issue

3

Start / End Page

207 / 218

Location

England

Related Subject Headings

  • Transcription, Genetic
  • Restriction Mapping
  • RNA, Ribosomal, 5.8S
  • RNA, Fungal
  • Polymorphism, Restriction Fragment Length
  • Phylogeny
  • Mycology & Parasitology
  • Molecular Sequence Data
  • DNA, Ribosomal
  • DNA, Fungal
 

Citation

APA
Chicago
ICMJE
MLA
NLM

Published In

J Med Vet Mycol

ISSN

0268-1218

Publication Date

1992

Volume

30

Issue

3

Start / End Page

207 / 218

Location

England

Related Subject Headings

  • Transcription, Genetic
  • Restriction Mapping
  • RNA, Ribosomal, 5.8S
  • RNA, Fungal
  • Polymorphism, Restriction Fragment Length
  • Phylogeny
  • Mycology & Parasitology
  • Molecular Sequence Data
  • DNA, Ribosomal
  • DNA, Fungal