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Castro-Fuentes CA, Frías-De-León MG, González-Villaseñor MDC, Duarte-Escalante E, Valencia-Ledezma OE, Martínez-Gamboa A, Meraz-Ríos B, Reyes-Montes MDR. Evaluation of Primers OPF-01, P54, and 1253 to Identify A. fumigatus, A. flavus, and A. niger from Polymorphic Patterns Obtained by RAPD-PCR. Pathogens 2024; 13:574. [PMID: 39057801 PMCID: PMC11280055 DOI: 10.3390/pathogens13070574] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2024] [Revised: 07/06/2024] [Accepted: 07/09/2024] [Indexed: 07/28/2024] Open
Abstract
We evaluated the specificity of the primers OPF-01, P54, and 1253 to identify A. fumigatus, A. flavus, and A. niger, respectively, with the RAPD-PCR method. Eighty-two isolates belonging to the sections Fumigati, Flavi, and Nigri were used. The isolates were identified by phenotypic (macro- and micromorphology) and genotypic (partial sequences of the BenA gene) methods. The RAPD-PCR method was used to obtain polymorphic patterns with the primers OPF-01, P54, and 1253. The specificity of the polymorphic patterns of the isolates of each species was evaluated through the UPGMA clustering method and logistic regression model. All isolates of the genus Aspergillus were identified at the section level by macro- and micromorphology showing the typical morphology of the sections Fumigati, Flavi, and Nigri, and the species were identified by the construction of the phylogeny of the partial sequence of the BenA gene. The patterns' polymorphic strains obtained with the primers OPF-01, P54, and 1253 for the isolates of A. fumigatus, A. flavus, and A niger, respectively, showed the same polymorphic pattern as the reference strains for each species. To verify the specificity of the primers, they were tested with other species from the sections Fumigati, Flavi and Nigri. The results support that the primers OPF-01, P54, and 1253 generate polymorphic patterns by RAPD-PCR species specific to A. fumigatus, A. flavus, and A. niger, respectively.
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Affiliation(s)
- Carlos Alberto Castro-Fuentes
- Posgrado en Ciencias Biológicas, Facultad de Medicina, Universidad Nacional Autónoma de México, Mexico City 04510, Mexico;
- Unidad de Investigación, Hospital Regional de Alta Especialidad de Ixtapaluca, IMSS-Bienestar. Calle Gustavo E. Campa 54, Col. Guadalupe Inn, Alcaldía Álvaro Obregón, Mexico City 01020, Mexico;
| | - María Guadalupe Frías-De-León
- Unidad de Investigación Biomédica, Hospital Regional de Alta Especialidad de Ixtapaluca, IMSS-Bienestar. Calle Gustavo E. Campa 54, Col. Guadalupe Inn, Alcaldía Álvaro Obregón, Mexico City 01020, Mexico;
| | | | - Esperanza Duarte-Escalante
- Departamento de Microbiología y Parasitología, Facultad de Medicina, Universidad Nacional Autónoma de México, Avenida Universidad 3000, Ciudad Universitaria, Coyoacán, Mexico City 04510, Mexico; (E.D.-E.); (B.M.-R.)
| | - Omar Esteban Valencia-Ledezma
- Unidad de Investigación, Hospital Regional de Alta Especialidad de Ixtapaluca, IMSS-Bienestar. Calle Gustavo E. Campa 54, Col. Guadalupe Inn, Alcaldía Álvaro Obregón, Mexico City 01020, Mexico;
| | - Areli Martínez-Gamboa
- Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Vasco de Quiroga 15, Belisario Domínguez Secc. 16, Tlalpan, Mexico City 14080, Mexico;
| | - Beatriz Meraz-Ríos
- Departamento de Microbiología y Parasitología, Facultad de Medicina, Universidad Nacional Autónoma de México, Avenida Universidad 3000, Ciudad Universitaria, Coyoacán, Mexico City 04510, Mexico; (E.D.-E.); (B.M.-R.)
| | - María del Rocío Reyes-Montes
- Departamento de Microbiología y Parasitología, Facultad de Medicina, Universidad Nacional Autónoma de México, Avenida Universidad 3000, Ciudad Universitaria, Coyoacán, Mexico City 04510, Mexico; (E.D.-E.); (B.M.-R.)
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Detection of Cryptic Candida Species Recognized as Human Pathogens Through Molecular Biology Techniques. CURRENT FUNGAL INFECTION REPORTS 2017. [DOI: 10.1007/s12281-017-0294-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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3
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Oliveira MME, Franco-Duarte R, Romeo O, Pais C, Criseo G, Sampaio P, Zancope-Oliveira RM. Evaluation of T3B fingerprinting for identification of clinical and environmental Sporothrix species. FEMS Microbiol Lett 2015; 362:fnv027. [PMID: 25714550 DOI: 10.1093/femsle/fnv027] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
In this study, PCR fingerprinting using the universal primer T3B was applied to distinguish among clinical and environmental species of the Sporothrix complex, Sporothrix brasiliensis, S. globosa, S. mexicana, S. pallida, S. luriei and S. schenckii sensu stricto. The T3B fingerprinting generated clearly distinct banding patterns, allowing the correct identification of all 43 clinical and environmental isolates at the species level, what was confirmed by partial calmodulin gene sequence analyses. This technique is reproducible and provides the identification of all species of the Sporothrix complex with sufficient accuracy to be applied in clinical mycology laboratories as well as in epidemiological studies in order to obtain a better understanding of the epidemiology of sporotrichosis.
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Affiliation(s)
| | - Ricardo Franco-Duarte
- Molecular and Environmental Biology Centre (CBMA), Universidade do Minho, 4710-057, Braga, Portugal
| | - Orazio Romeo
- Department of Environmental and Biological Sciences - University of Messina, 98166, Italy
| | - Célia Pais
- Molecular and Environmental Biology Centre (CBMA), Universidade do Minho, 4710-057, Braga, Portugal
| | - Giuseppe Criseo
- Department of Environmental and Biological Sciences - University of Messina, 98166, Italy
| | - Paula Sampaio
- Molecular and Environmental Biology Centre (CBMA), Universidade do Minho, 4710-057, Braga, Portugal
| | - Rosely Maria Zancope-Oliveira
- Laboratório de Micologia, Instituto de Pesquisa Clínica Evandro Chagas, Fundação Oswaldo Cruz, Rio de Janeiro, RJ 21045-900, Brazil
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Zheng Y, Li Z, He X. Influence of fixed orthodontic appliances on the change in oral Candida strains among adolescents. J Dent Sci 2014; 11:17-22. [PMID: 30894940 PMCID: PMC6395155 DOI: 10.1016/j.jds.2014.02.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2013] [Revised: 01/04/2014] [Indexed: 11/27/2022] Open
Abstract
Background/purpose The aim of this study was to explore the presence and variability of oral Candida in adolescents before and during treatment with fixed orthodontic appliances. Materials and methods A total of 50 patients aged 10–18 years old were randomly selected for this study. Microorganism samples were obtained prior to and after orthodontic treatment and identified by culture methods. Molecular biology techniques were used to investigate the samples further and the effect of the orthodontic appliance on oral pathogenic yeasts was studied longitudinally. Results The percentage of patients with candidiasis and the total number of colony-forming units significantly increased 2 months after orthodontic treatment. Changes in the type of oral candidiasis prior to and after treatment were significant. Conclusion Fixed orthodontic appliances can influence the growth of oral pathogenic yeasts among adolescents.
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Affiliation(s)
- Yan Zheng
- School of Stomatology, Lanzhou University, Lanzhou, China
| | - Zhenya Li
- Orthodontic Department, People's Hospital of Gansu Province, Lanzhou, China
| | - Xiangyi He
- School of Stomatology, Lanzhou University, Lanzhou, China
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5
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Abstract
This article describes PCR fingerprinting using the universal primer T3B to distinguish among species of the Sporothrix complex, S. brasiliensis, S. globosa, S. mexicana, and S. schenckii. This methodology generated distinct banding patterns, allowing the correct identification of all 35 clinical isolates at the species level, confirmed by partial calmodulin (CAL) gene sequence analyses. This methodology is simple, reliable, rapid, and cheap, making it an ideal routine identification system for clinical mycology laboratories.
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6
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Harun A, Perdomo H, Gilgado F, Chen SCA, Cano J, Guarro J, Meyer W. Genotyping ofScedosporiumspecies: a review of molecular approaches. Med Mycol 2009; 47:406-14. [DOI: 10.1080/13693780802510240] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
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Chen S, Slavin M, Nguyen Q, Marriott D, Playford EG, Ellis D, Sorrell T. Active surveillance for candidemia, Australia. Emerg Infect Dis 2007; 12:1508-16. [PMID: 17176564 PMCID: PMC3290948 DOI: 10.3201/eid1210.060389] [Citation(s) in RCA: 140] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
This infection has a high death rate and is predominantly associated with healthcare. Population-based surveillance for candidemia in Australia from 2001 to 2004 identified 1,095 cases. Annual overall and hospital-specific incidences were 1.81/100,000 and 0.21/1,000 separations (completed admissions), respectively. Predisposing factors included malignancy (32.1%), indwelling vascular catheters (72.6%), use of antimicrobial agents (77%), and surgery (37.1%). Of 919 episodes, 81.5% were inpatient healthcare associated (IHCA), 11.6% were outpatient healthcare associated (OHCA), and 6.9% were community acquired (CA). Concomitant illnesses and risk factors were similar in IHCA and OHCA candidemia. IHCA candidemia was associated with sepsis at diagnosis (p<0.001), death <30 days after infection (p<0.001), and prolonged hospital admission (p<0.001). Non–Candida albicans species (52.7%) caused 60.5% of cases acquired outside hospitals and 49.9% of IHCA candidemia (p = 0.02). The 30-day death rate was 27.7% in those >65 years of age. Adult critical care stay, sepsis syndrome, and corticosteroid therapy were associated with the greatest risk for death. Systematic epidemiologic studies that use standardized definitions for IHCA, OHCA, and CA candidemia are indicated.
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Affiliation(s)
- Sharon Chen
- Westmead Hospital, Westmead, New South Wales, Australia.
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Neppelenbroek KH, Campanha NH, Spolidorio DMP, Spolidorio LC, Seó RS, Pavarina AC. Molecular fingerprinting methods for the discrimination between C. albicans and C. dubliniensis. Oral Dis 2006; 12:242-53. [PMID: 16700733 DOI: 10.1111/j.1601-0825.2005.01189.x] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Opportunistic fungal pathogens are becoming increasingly important causes of both community-acquired and nosocomial infections. The most important fungal pathogens are yeast species belonging to the genus Candida. These species show differences in levels of resistance to antifungal agents and mortality. Consequently, it is important to correctly identify the causative organism to the species level. Identification of Candida dubliniensis in particular remains problematic because of the high degree of phenotypic similarity between this species and Candida albicans. However, as the differences between both are most pronounced at the genetic level, several studies have been conducted in order to provide a specific and rapid identification fingerprinting molecular test. In most candidal infectious, no single DNA fingerprinting technique has evolved as a dominant method, and each method has its advantages, disadvantages and limitations. Moreover, the current challenge of these techniques is to compile standardized patterns in a database for interlaboratory use and future reference. This review provides an overview of most common molecular fingerprinting techniques currently available for discrimination of C. albicans and C. dubliniensis.
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Affiliation(s)
- K H Neppelenbroek
- Department of Dental Materials and Prosthodontics, Araraquara Dental School, São Paulo State University, São Paulo, Brazil
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9
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Chavasco JK, Paula CR, Hirata MH, Aleva NA, Melo CED, Gambale W, Ruiz LDS, Franco MC. Molecular identification of Candida dubliniensis isolated from oral lesions of HIV-positive and HIV-negative patients in São Paulo, Brazil. Rev Inst Med Trop Sao Paulo 2006; 48:21-6. [PMID: 16547575 DOI: 10.1590/s0036-46652006000100005] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Candida dubliniensis is a new, recently described species of yeast. This emerging oral pathogen shares many phenotypic and biochemical characteristics with C. albicans, making it hard to differentiate between them, although they are genotypically distinct. In this study, PCR (Polymerase Chain Reaction) was used to investigate the presence of C. dubliniensis in samples in a culture collection, which had been isolated from HIV-positive and HIV-negative patients with oral erythematous candidiasis. From a total of 37 samples previously identified as C. albicans by the classical method, two samples of C. dubliniensis (5.4%) were found through the use of PCR. This study underscores the presence of C. dubliniensis, whose geographical and epidemiological distribution should be more fully investigated.
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Giammanco GM, Lopes MM, Coimbra RS, Pignato S, Grimont PA, Grimont F, Freitas G, Giammanco G. Value of morphotyping for the characterization of Candida albicans clinical isolates. Mem Inst Oswaldo Cruz 2005; 100:483-90. [PMID: 16184225 DOI: 10.1590/s0074-02762005000500007] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Until recently, morphotyping, a method evaluating fringe and surface characteristics of streak colonies grown on malt agar, has been recommended as a simple and unexpensive typing method for Candida albicans isolates. The discriminatory power and reproducibility of Hunter's modified scheme of Phongpaichit's morphotyping has been evaluated on 28 C. albicans isolates recovered from the oral cavity of asymptomatic human immunodeficiency virus-positive subjects, and compared to two molecular typing methods: randomly amplified polymorphic DNA (RAPD) fingerprinting, and contour clamped homogeneous electric field (CHEF) electrophoretic karyotyping. Morphological features of streak colonies allowed to distinguish 11 different morphotypes while RAPD fingerprinting yielded 25 different patterns and CHEF electrophoresis recognized 9 karyotypes. The discriminatory power calculated with the formula of Hunter and Gaston was 0.780 for morphotyping, 0.984 for RAPD fingerprinting, and 0.630 for karyotyping. Reproducibility was tested using 43 serial isolates from 15 subjects (2 to 6 isolates per subject) and by repeating the test after one year storage of the isolates. While genetic methods generally recognized a single type for all serial isolates from each of the subjects studied, morphotyping detected strain variations in five subjects in the absence of genetic confirmation. Poor reproducibility was demonstrated repeating morphotyping after one year storage of the isolates since differences in at least one character were detected in 92.9% of the strains.
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Affiliation(s)
- Giovanni M Giammanco
- Departamento de Microbiologia, Faculdade de Farmácia, Universidade de Lisboa, Lisboa, Portugal.
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Correia A, Sampaio P, Almeida J, Pais C. Study of molecular epidemiology of candidiasis in portugal by PCR fingerprinting of Candida clinical isolates. J Clin Microbiol 2005; 42:5899-903. [PMID: 15583336 PMCID: PMC535247 DOI: 10.1128/jcm.42.12.5899-5903.2004] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
PCR fingerprinting was used to type 177 yeast isolates obtained from two medical institutions. Candida albicans was the predominant species found, followed by C. tropicalis, C. glabrata, C. parapsilosis, C. guilliermondii, and C. krusei, which accounted for over 20% of the strains isolated. This survey represents the first study of molecular epidemiology of candidiasis in Portugal.
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Affiliation(s)
- Alexandra Correia
- Centro de Biologia da Universidade do Minho (CBUM), Departamento de Biologia, Campus de Gualtar, 4710-057 Braga, Portugal
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12
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Karaoglu H, Lee CMY, Meyer W. Survey of Simple Sequence Repeats in Completed Fungal Genomes. Mol Biol Evol 2004; 22:639-49. [PMID: 15563717 DOI: 10.1093/molbev/msi057] [Citation(s) in RCA: 193] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
The use of simple sequence repeats or microsatellites as genetic markers has become very popular because of their abundance and length variation between different individuals. SSRs are tandem repeat units of 1 to 6 base pairs that are found abundantly in many prokaryotic and eukaryotic genomes. This is the first study examining and comparing SSRs in completely sequenced fungal genomes. We analyzed and compared the occurrences, relative abundance, relative density, most common, and longest SSRs in nine taxonomically different fungal species: Aspergillus nidulans, Cryptococcus neoformans, Encephalitozoon cuniculi, Fusarium graminearum, Magnaporthe grisea, Neurospora crassa, Saccharomyces cerevisiae, Schizosaccharomyces pombe, and Ustilago maydis. Our analysis revealed that, in all of the genomes studied, the occurrence, abundance, and relative density of SSRs varied and was not influenced by the genome sizes. No correlation between relative abundance and the genome sizes was observed, but it was shown that N. crassa, the largest genome analyzed had the highest relative abundance of SSRs. In most genomes, mononucleotide, dinucleotide, and trinucleotide repeats were more abundant than the longer repeated SSRs. Generally, in each organism, the occurrence, relative abundance, and relative density of SSRs decreased as the repeat unit increased. Furthermore, each organism had its own common and longest SSRs. Our analysis showed that the relative abundance of SSRs in fungi is low compared with the human genome and that longer SSRs in fungi are rare. In addition to providing new information concerning the abundance of SSRs for each of these fungi, the results provide a general source of molecular markers that could be useful for a variety of applications such as population genetics and strain identification of fungal organisms.
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Affiliation(s)
- Haydar Karaoglu
- School of Molecular and Microbial Biosciences, University of Sydney, Sydney, Australia
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Deák R, Bodai L, Aarts HJM, Maráz A. Development of a novel, simple and rapid molecular identification system for clinicalCandidaspecies. Med Mycol 2004; 42:311-8. [PMID: 15473355 DOI: 10.1080/13693780310001624574] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
Abstract
Identification of clinical yeast isolates causing candidiasis is routinely performed by commercial yeast identification systems based on biochemical, morphological and physiological tests. These systems require 3-5 days and the proportion of identifications that are incorrect is high. Our novel and rapid molecular identification system for clinical Candida species is based on the analysis of restriction patterns obtained from PCR-generated ribosomal DNA sequences using five restriction enzymes. A software package (CandID) was designed to include a database of restriction fragment length polymorphism (RFLP) patterns for 29 Candida species. For 'in-house' validation, 122 clinical isolates that had previously identified in clinical laboratories were typed by this system. These clinical isolates were also independently re-identified by the API 20C AUX system. The ribosomal DNA RFLP database in the context of supporting analytical software allowed simple and rapid (1 work day) identification.
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Affiliation(s)
- R Deák
- Department of Microbiology and Biotechnology Faculty of Food Science, Szent István University, Budapest.
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Borst A, Theelen B, Reinders E, Boekhout T, Fluit AC, Savelkoul PHM. Use of amplified fragment length polymorphism analysis to identify medically important Candida spp., including C. dubliniensis. J Clin Microbiol 2003; 41:1357-62. [PMID: 12682114 PMCID: PMC153876 DOI: 10.1128/jcm.41.4.1357-1362.2003] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Non-Candida albicans Candida species are increasingly being isolated. These species show differences in levels of resistance to antimycotic agents and mortality. Therefore, it is important to be able to correctly identify the causative organism to the species level. Identification of C. dubliniensis in particular remains problematic due to the high degree of phenotypic similarity between this species and C. albicans. The use of amplified fragment length polymorphism (AFLP) analysis as an identification method for medically important Candida species was investigated. Our results show very clear differences among medically important Candida species. Furthermore, when screening a large collection of clinical isolates previously identified on CHROMagar as C. albicans, we found a misidentification rate of 6%. AFLP analysis is universally applicable, and the patterns can easily be stored in a general, accessible database. Therefore, AFLP might prove to be a reliable method for the identification of medically important Candida species.
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Affiliation(s)
- A Borst
- Eijkman-Winkler Center for Microbiology, Infectious Diseases and Inflammation, University Medical Center, Utrecht, The Netherlands.
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Bautista-Muñoz C, Boldo XM, Villa-Tanaca L, Hernández-Rodríguez C. Identification of Candida spp. by randomly amplified polymorphic DNA analysis and differentiation between Candida albicans and Candida dubliniensis by direct PCR methods. J Clin Microbiol 2003; 41:414-20. [PMID: 12517882 PMCID: PMC149553 DOI: 10.1128/jcm.41.1.414-420.2003] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Because Candida species have innately highly variable antifungal susceptibilities, the availability of a fast and reliable species identification test is very important so that suitable and effective therapeutic measures may be taken. Using three oligonucleotide primers, we established a randomly amplified polymorphic DNA (RAPD) analysis method that enabled direct identification of the most common opportunistic pathogenic Candida species. RAPD analysis revealed a characteristic molecular fingerprint for each Candida species. Differences between the profiles for Candida albicans and C. dubliniensis were evident. RAPD analysis is a relatively easy, reproducible, and reliable technique that can be useful in providing genetic fingerprints for the identification of strains. In addition, a collection of different C. albicans strains was identified by a specific PCR based on multiple secreted aspartic proteinase (SAP) genes and the dipeptidyl aminopeptidase (DAP2) gene. Our findings demonstrate that PCR based upon the SAP and DAP2 sequences is a simple, rapid, clear, and direct technique for the identification and differentiation of C. albicans and C. dubliniensis.
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Affiliation(s)
- Consuelo Bautista-Muñoz
- Departamento de Microbiología, Escuela Nacional de Ciencias Biológicas, I.P.N., Mexico D.F., Mexico
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Selvarangan R, Limaye AP, Cookson BT. Rapid identification and differentiation of Candida albicans and Candida dubliniensis by capillary-based amplification and fluorescent probe hybridization. J Clin Microbiol 2002; 40:4308-12. [PMID: 12409417 PMCID: PMC139684 DOI: 10.1128/jcm.40.11.4308-4312.2002] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
We developed a rapid genotypic assay to differentiate the germ tube-positive yeasts Candida albicans and Candida dubliniensis. Fluorescently labeled nucleic acid probe binding and subsequent denaturation from the target site in the PCR amplicons produced characteristic peak melting temperatures (T(m)) that identified each species. Peak T(m)s of C. albicans (n = 69) and C. dubliniensis (n = 28) isolates produced in the presence of their respective probes were 61.04 +/- 0.64 degrees C and 60.52 +/- 1.01 degrees C (averages +/- standard deviations). No signal was generated when the C. albicans or C. dubliniensis probes were tested against DNA from their counterparts. Both probes reacted with Candida tropicalis DNA, but the T(m) was 51.85 +/- 0.05 degrees C with the C. albicans probe and 51.92 +/- 0.10 degrees C with the C. dubliniensis probe, differentiating C. tropicalis DNA from C. albicans and C. dubliniensis. A novel hybrid probe was designed to identify both species in a single reaction based on a 4 degrees C difference in peak T(m)s. Our assay is rapid (</=2 h) and allows reliable detection and differentiation of the two germ tube-positive Candida spp.
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Affiliation(s)
- Rangaraj Selvarangan
- Departments of Laboratory Medicine. Medicine. Microbiology, University of Washington Medical Center, Seattle, Washington 98195-7110, USA
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Current awareness on yeast. Yeast 2001; 18:1269-76. [PMID: 11561294 DOI: 10.1002/yea.689] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
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