Genetic diversity of medically important and emerging Candida species causing invasive infection

Genetic diversity of medically important and emerging Candida species causing invasive infection

Author Merseguel, Karina Bellinghausen Autor UNIFESP Google Scholar
Nishikaku, Angela Satie Autor UNIFESP Google Scholar
Rodrigues, Anderson Messias Autor UNIFESP Google Scholar
Padovan, Ana Carolina Autor UNIFESP Google Scholar
Ferreira, Renata Carmona Autor UNIFESP Google Scholar
Melo, Analy Salles de Azevedo Autor UNIFESP Google Scholar
Briones, Marcelo Ribeiro da Silva Autor UNIFESP Google Scholar
Colombo, Arnaldo Lopes Autor UNIFESP Google Scholar
Institution Universidade Federal de São Paulo (UNIFESP)
Univ Fed Alfenas
Abstract Background: Genetic variation in the ribosomal DNA (rDNA) internal transcribed spacer (ITS) region has been studied among fungi. However, the numbers of ITS sequence polymorphisms in the various Candida species and their associations with sources of invasive fungal infections remain poorly investigated. Here, we characterized the intraspecific and interspecific ITS diversity of Candida spp. strains collected from patients with bloodstream or oroesophageal candidiasis.Methods: We selected cultures of representative medically important species of Candida as well as some rare and emerging pathogens. Identification was performed by micromorphology and by biochemical testing using an ID32C (R) system, as well as by the sequencing of rDNA ITS. the presence of intraspecific ITS polymorphisms was characterized based on haplotype networks, and interspecific diversity was characterized based on Bayesian phylogenetic analysis.Results: Among 300 Candida strains, we identified 76 C. albicans, 14 C. dubliniensis, 40 C. tropicalis, 47 C. glabrata, 34 C. parapsilosis (sensu stricto), 31 C. orthopsilosis, 3 C. metapsilosis, 21 Meyerozyma guilliermondii (C. guilliermondii), 12 Pichia kudriavzevii (C. krusei), 6 Clavispora lusitaniae (C. lusitaniae), 3 C. intermedia, 6 Wickerhamomyces anomalus (C. pelliculosa), and 2 C. haemulonii strains, and 1 C. duobushaemulonii, 1 Kluyveromyces marxianus (C. kefyr), 1 Meyerozyma caribbica (C. fermentati), 1 Pichia norvegensis (C. norvegensis), and 1 Lodderomyces elongisporus strain. Out of a total of seven isolates with inconsistent ID32C (R) profiles, ITS sequencing identified one C. lusitaniae strain, three C. intermedia strains, two C. haemulonii strains and one C. duobushaemulonii strain. Analysis of ITS variability revealed a greater number of haplotypes among C. albicans, C. tropicalis, C. glabrata and C. lusitaniae, which are predominantly related to endogenous sources of acquisition. Bayesian analysis confirmed the major phylogenetic relationships among the isolates and the molecular identification of the different Candida spp.Conclusions: Molecular studies based on ITS sequencing are necessary to identify closely related and emerging species. Polymorphism analysis of the ITS rDNA region demonstrated its utility as a genetic marker for species identification and phylogenetic relationships as well as for drawing inferences concerning the natural history of hematogenous infections caused by medically important and emerging Candida species.
Keywords Candida spp.
DNA sequencing
Internal transcribed spacer region
Haplotype network
Nosocomial acquisition of candidemia
Language English
Sponsor Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
Grant number FAPESP: 2007/08575-1
Date 2015-02-13
Published in Bmc Infectious Diseases. London: Biomed Central Ltd, v. 15, 11 p., 2015.
ISSN 1471-2334 (Sherpa/Romeo, impact factor)
Publisher Biomed Central Ltd
Extent 11
Access rights Open access Open Access
Type Article
Web of Science ID WOS:000349866400002

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