Spoligotyping and pncA polymorphism: a two step scenario for Mycobacterium bovis diagnosis in Portugal.
The differential diagnosis of Mycobacterium bovis is important in the control of transmission to the human population and also for treatment since M. bovis is naturally resistant to pyrazinamide. Eleven clinical isolates from the Fernando Fonseca Hospital with Spoligotypes indicative of M. bovis, through the absence of spacers 39-43 but that also counted with the absence of spacer 38, were analyzed. For the identification of these strains, the phenotypic analysis of pyrazinamide resistance and study of the polymorphisms of the pncA and gyrB genes were carried out. The study of the pncA polymorphism revealed that the strains analyzed did not contain the M. bovis specific mutation. In relation the gyrB polymorphisms, using the GenoTypeO MTBC kit, the strains were identified as belonging to the group M. tuberculosis, M. africanum subtipo II e M. canetti. The present investigation enabled us to define new genotypes on which future bacteriological studies should be based. Amongst these the study of the pncA polymorphism was considered important due to the immediate practical implications for the clinician. Evaluating transmission and defining groups of risk is an objective for which support from the veterinary services is considered relevant.
David
Suzana
S
Lisboa/Microbacteriology Teaching and Research Unit, Hygiene and Tropical Medicine Institute/ Nova University Lisbon, Lisbon, Portugal. suzanadavid@ihmt.unl.pt
Portugal
Clara
C
Antunes
Abílio
A
Calado
Ana
A
Cardoso
Angela
A
Barros
Vanessa
V
Sancho
Luísa
L
de Sousa
José Germano
JG
D000581:Amidohydrolases / Q000235:genetics*; D006801:Humans; D009163:Mycobacterium bovis / Q000145:classification* / Q000235:genetics* / Q000302:isolation & purification; D016133:Polymerase Chain Reaction; D011110:Polymorphism, Genetic; D011174:Portugal; D014376:Tuberculosis / Q000175:diagnosis* / Q000382:microbiology*
D000581:Amidohydrolases; C487496:PncA protein, Mycobacterium tuberculosis