Comparison of multilocus sequence typing and Ca3 fingerprinting for molecular subtyping epidemiologically-related clinical isolates of Candida albicans.
Southern hybridization with the complex probe Ca3 is a well established tool for molecular subtyping of Candida albicans. Multilocus sequence typing (MLST) is a DNA sequence-based subtyping method recently applied to C. albicans and shown to have a high degree of intraspecies discriminatory power. However, its utility for studying the molecular epidemiology of sequential isolates from recurrent disease has not been established. We compared Ca3 Southern hybridization and MLST using seven housekeeping genes (CaAAT1a, CaACC1, CaADP1, CaPMI, CaSYA1, CaVPS13, CaZWF1b) for their ability to discriminate among 37 C. albicans isolates from recurrent cases of oropharyngeal candidiasis (OPC) in ten HIV-positive patients from India and the US. Among the 37 isolates, MLST identified 23 distinct genotypes (index of diversity = 97%); Ca3 Southern hybridization identified 21 distinct genotypes (index of diversity = 95%). Both methods clustered isolates into seven genetically-related groups and, with one exception, isolates that were indistinguishable by MLST were indistinguishable or highly related by Ca3 Southern hybridization. These results demonstrate that MLST performs equally well or better compared to Ca3 Southern hybridization for defining genetic-relatedness of sequential C. albicans isolates from recurrent cases of OPC in HIV-positive patients.
Chowdhary
Anuradha
A
Mycotic Diseases Branch, Centers for Disease Control and Prevention, Atlanta, GA 30333, USA.
Lee-Yang
Wendy
W
Lasker
Brent A
BA
Brandt
Mary E
ME
Warnock
David W
DW
Arthington-Skaggs
Beth A
BA
D015139:Blotting, Southern / Q000379:methods*; D002176:Candida albicans / Q000145:classification* / Q000235:genetics; D002177:Candidiasis / Q000150:complications / Q000453:epidemiology / Q000382:microbiology*; D015342:DNA Probes; D005800:Genes, Fungal; D015658:HIV Infections / Q000150:complications; D006801:Humans; D007194:India / Q000453:epidemiology; D017720:Molecular Epidemiology / Q000379:methods*; D009059:Mouth Diseases / Q000150:complications / Q000453:epidemiology / Q000382:microbiology*; D009960:Oropharynx / Q000382:microbiology; D010608:Pharyngeal Diseases / Q000150:complications / Q000453:epidemiology / Q000382:microbiology*; D017422:Sequence Analysis, DNA / Q000379:methods*; D014481:United States / Q000453:epidemiology; D014505:Urban Population
D015342:DNA Probes