TY - JOUR T1 - Identification of cultured isolates of clinically important yeast species using fluorescent fragment length analysis of the amplified internally transcribed rRNA spacer 2 region (ITS2)36710 JF - BMC.Microbiol. Y1 - 2002 A1 - De Baere,T. A1 - Claeys,G. A1 - Swinne,D. A1 - Verschraegen,G. A1 - Muylaert,A. A1 - Massonet,C. A1 - Vaneechoutte,M. KW - 0 KW - a KW - an KW - analysi KW - analysis KW - article KW - Belgium KW - chemistry KW - Clinical KW - Cryptococcus KW - data KW - Diagnosis KW - Dna KW - DNA,Fungal KW - DNA,Ribosomal Spacer KW - dye KW - Dyes KW - electronic KW - expertise KW - Features KW - Fluorescent Dyes KW - Fluorometry KW - Genes,Fungal KW - Genes,rRNA KW - genetics KW - Group KW - growth & development KW - hospital KW - identification KW - im KW - immunology KW - INFECTION KW - IS KW - isolation & purification KW - journal KW - Laboratories KW - method KW - methods KW - microbiology KW - Mycoses KW - Nucleic Acid Amplification Techniques KW - ON KW - pathogenicity KW - Patient KW - patients KW - Phylogeny KW - polymerase chain reaction KW - Polymorphism,Restriction Fragment Length KW - region KW - result KW - results KW - Saccharomycetales KW - SB - IM KW - Size KW - Species Specificity KW - Therapy KW - transcription,genetic KW - Trichosporon KW - Universities KW - university KW - university hospital KW - varieties KW - variety KW - yeasts AB - BACKGROUND: The number of patients candidate to yeast infection has increased during the last years. Also the variety of species of clinical importance has increased. Correct species identification is often important for efficient therapy, but is based on phenotypic features and is sometimes time-consuming and depends largely on the expertise of technicians. Therefore, we evaluated the feasability of PCR-based amplification of the Internally Transcribed Spacer region 2, followed by fragment size analysis on the ABI Prism 310 for the identification of clinically important yeasts. RESULTS: A rapid DNA-extraction method, based on simple boiling freezing was introduced. Of the 25 species tested, 22 could be identified unambiguously by scoring the length of the ITS2-region. No distinction could be made between the species T. asteroides and T. inkin and between T. mucoides and T. ovoides. The two varieties of Cryptococcus neoformans (var. neoformans and var. gattii) could be differentiated from each other due to a one bp length difference of the ITS2 fragment. The three C. laurentii isolates were split in two groups according to their ITS2-fragment lengths, in correspondence with the phylogenetic groups described previously. Since the obtained fragment lenghts compared well to those described previously, an internationally usable library of ITS2 fragment lengths can be constructed. CONCLUSIONS: The existing ITS2 size based library enables identification of most of the clinically important yeast species, within 6 hours starting from a single colony, can be easily updated when new species are described. Data can be exchanged between laboratories VL - 2 U1 - 36710 M3 - http://dx.doi.org/ ER -