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Revista Cubana de Medicina Tropical
versão impressa ISSN 0375-0760versão On-line ISSN 1561-3054
Rev Cubana Med Trop v.57 n.1 Ciudad de la Habana jan.-abr. 2005
Índice Anterior Siguiente
REV CUBANA MED TROP 2005;57(1):51-2
Istituto Zooprofilattico Sperimentale della Sicilia A. Mirri Palermo, Italy
Comparison of different DNA extraction and polymerase chain reaction methods to detect Leptospira spp. on field samples
Dr. Maria Vitale,1 Dr. Fabrizio Vitale,2 Dr. Stefano Reale,3 Dr. Gesualdo Vesco,3 Dr. Vittoria Currò2 y Dr. Santo Caracappa2
Summary
It was carried out a comparison on two reference Leptospira strains DNA between different extraction methods and two polymerase chain reaction protocol. The DNA was quantified and serial dilutions were tested by polymerase chain reaction. The results showed difference in terms of recovery and sensitivity between this methods.
Key words: Leptospira, DNA extraction, PCR.
In
L.
Leptospira cells were counted on a Burker chamber and serial dilution were performed up to 50 cells/100 microliters. The suspension was introduced with a syringe in 25 mg of negative bovine Kidney samples and DNA extraction had been performed by the following methods:
A) Proteinase K treatment followed by phenol-chloroform extraction.
B) Quiagen column affinity following manufacture extraction.
C) Rybolyser homogenization followed by affinity column.
The DNA was quantified and serial dilutions were tested by PCR.
Two PCR method were used for sensitivity assay targeting
The analysis, performed in double, showed that not much difference in terms of recovery and sensitivity are present between the methods A and B but method C gives a higher sensitivity probably due to a better lysis and a more efficient proteinase K digestion.
DNA extracted by homogenization with ribolyser showed a sensitivity of up to 5 cell with flaB PCR but a further 5 fold dilution could be detected by 16 ribosomal RNA gene PCR.
Comparación de diferentes métodos de extracción de ADN y reacción de polimerasa en cadena para detectar Leptospira spp. en muestras de campo
Resumen
Se realizó una comparación entre diferentes métodos de extracción y 2 protocolos de reacción en cadena de la polimerasa en 2 ADN de cepas de Leptospira de referencia. El ADN se cuantificó y se probaron diluciones seriadas mediante la reacción en cadena de la polimerasa. Los resultados mostraron diferencias en términos de recuperación y sensibilidad entre estos métodos.
Palabras clave: Leptospira, ADN, extracción, RCP.
References
- Kawabata H, Dancel LA, Vilanueva SYAM, Yanagihara Y, Koizumi N, Watanabe H. -flaB-polymerase chain reaction (flaB-PCR) and its Restriction Fragment Length Polymorphism (RFLP) analysis are an efficient tool for detection and identification of Leptospira spp. Microbiol Immunol 2001;45(6):491-6.
- Faber NA, Crawford M, LeFebvre RB, Buyukmihci NC, Madigan JE, Willits NH. Detection of Leptospira spp. in the aqueous humor of horses with naturally acquired recurrent uveitis. J Clin Microbiol 2000;38(7):2731-3.
Recibido: 27 de diciembre de 2004. Aprobado: 10 de marzo de 2005.
Dr. Maria Vitale. Istituto Zooprofilattico Sperimentale della Sicilia A. Mirri
1 Doctor in Veterinary Medicine. Molecular Biology.
2 Doctor in Veterinary Medicine.
3 Doctor in Biological Sciences.