Premium
Molecular Identification of Coccidioides Isolates from Mexican Patients
Author(s) -
CASTAÑÓNOLIVARES LAURA ROCÍO,
GÜEREÑAELIZALDE DIEGO,
GONZÁLEZMARTÍNEZ MARISELA ROCÍO,
LICEANAVARRO ALEXEI FEDOROVICH,
GONZÁLEZGONZÁLEZ GLORIA MARÍA,
AROCHCALDERÓN ARTURO
Publication year - 2007
Publication title -
annals of the new york academy of sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.712
H-Index - 248
eISSN - 1749-6632
pISSN - 0077-8923
DOI - 10.1196/annals.1406.047
Subject(s) - coccidioides , coccidioides immitis , biology , genetics , single nucleotide polymorphism , microbiology and biotechnology , genotype , gene
: Molecular studies of the genome of the fungus Coccidioides have demonstrated two nearly identical, but well‐identified species, Coccidioides immitis and C. posadasii, known as “California” and “non‐California” species, respectively. The objective of this study was to determine, through molecular methods, whether both species of Coccidioides are present in Mexican patients with coccidioidomycosis and to estimate, their geographical distribution in Mexico. We analyzed 56 clinical isolates of Coccidioides spp. from Mexican patients. Molecular identification of each strain was done by means of real time PCR using TaqMan® probes to amplify single nucleotide polymorphisms (SNPs) in four target sequences, loci , named proline 157, proline 174, hexokinase 149 and glucose‐synthase 192. SNP analysis identified two of the 56 isolates as Coccidioides immitis and the remaining 54 as C. posadasii . The dual probe assay that included proline 157, proline 174 and glucose‐synthase 192 gave consistent results on SNP differentiation between the two species. In contrast, the template matching hexokinase 149 gave negative results for any species in 34 samples. Our results did not show geographical overlap of the species, and they also confirmed that C. posadasii is the most frequent species in Mexico. A vast majority of C. posadasii strains were localized in the north‐central region of the country.