Identification, typing, and phylogenetic relationships of the main clinical Nocardia species in spain according to their gyrB and rpoB genes.

Abstract:

:This study compares the identification, typing, and phylogenetic relationships of the most prevalent clinical Nocardia species in Spain, as determined via sequence analysis of their housekeeping genes gyrB and rpoB, with the results returned by the gold standard 16S rRNA method. gyrB and rpoB analyses identified Nocardia abscessus, N. cyriacigeorgica, N. farcinica, and the N. nova complex, species that together account for more than half of the human nocardiosis cases recorded in Spain. The individual discriminatory power of gyrB and rpoB with respect to intraspecies typing, calculated using the Hunter-Gaston discriminatory index (HGDI), was generally high (HGDI, 0.85 to 1), except for rpoB with respect to N. farcinica (HGDI, 0.71). Phylogenetically, different degrees of intra- and interspecies microheterogeneity were observed for gyrB and rpoB in a group of 119 clinical strains. A single 16S haplotype was obtained for each species, except for the N. nova complex (8 types), while gyrB and rpoB were more polymorphic: N. abscessus had 14 and 18 haplotypes, N. cyriacigeorgica had 17 and 12, N. farcinica had 11 and 5, and the N. nova complex had 26 and 29 haplotypes, respectively. A diversity gradient was therefore seen, with N. farcinica at the bottom followed by N. abscessus and N. cyriacigeorgica in the middle and N. nova complex at the top. The complexity of the N. nova complex is highlighted by its six variations in the GyrB (126)AAAPEH motif. gyrB sequencing (with or without rpoB sequencing) offers a simple means for identifying the most prevalent Nocardia species in Spanish medical laboratories and for determining the intraspecific diversity among their strains.

journal_name

J Clin Microbiol

authors

Carrasco G,Valdezate S,Garrido N,Villalón P,Medina-Pascual MJ,Sáez-Nieto JA

doi

10.1128/JCM.00515-13

subject

Has Abstract

pub_date

2013-11-01 00:00:00

pages

3602-8

issue

11

eissn

0095-1137

issn

1098-660X

pii

JCM.00515-13

journal_volume

51

pub_type

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