Microagregación genética y geográfica de aislados del virus linfotrópico humano tipo I (HTLV-I) en zonas endémicas del suroccidente de Colombia

With the aim to explore the restriction fragment length polymorphism (RFLP) to Dde I restriction enzyme, the proviral region from 5181 to 6624 nts of HTLV-I was amplified by PCR. The 1033 bp fragment containing the terminal 5' of gene pol and the surface domain of envelope gene (gp46) was ampli...

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Published inColombia médica (Cali, Colombia) Vol. 31; no. 3
Main Author Felipe García, Mónica Chávez, Martha Cecilia Domínguez, Abraham Blank
Format Journal Article
LanguageSpanish
Published Universidad del Valle - Facultad de Salud 20.07.2005
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Summary:With the aim to explore the restriction fragment length polymorphism (RFLP) to Dde I restriction enzyme, the proviral region from 5181 to 6624 nts of HTLV-I was amplified by PCR. The 1033 bp fragment containing the terminal 5' of gene pol and the surface domain of envelope gene (gp46) was amplified from PBMC proviral DNA of 29 HTLV-I seropositive individuals from several areas of southwest Colombia. The restriction analysis performed with Dde I revealed the circulation of three different Dde I RFLP patterns. Pattern I (900 and 125 bp) was observed in 34.5% (10/29) of isolates. Pattern IIa (700, 205 and 125 bp) was detected in 51.7% (15/29) of individuals. Finally, pattern IIb (550, 350 and 125 bp) included only 13.8% (4/29) of samples studied. Pattern IIb was exclusively detected in Tumaco in contrast with patterns I and IIa that exhibited a tendency to be distributed in the inland areas of southwest. Taken together results showed the existence of a divergent microevolutionary mechanism operating in endemic areas for HTLV-I infection of southwest Colombia. Con el objetivo de definir el polimorfismo de patrones de restricción (RFL) para la endonucleasa de restricción DdeI, de la región del HTLV-I de los 5181 a los 6624 nucleótidos, se amplificó un segmento de 1033 bp que incluía la porción terminal 5' del gen Pol y el dominio de superficie del gen Env (gp46) del ADN proviral de PBMC obtenido de 29 personas seropositivas para el HTLV-I provenientes de varias zonas el suroccidente de Colombia. El análisis de restricción efectuado con la endonucleasa DdeI, reveló la existencia de tres patrones de RFLPs diferentes. El patrón I (900 y 125 pb), se observó en 34.5% (10/29) de los aislados. El patrón IIa (700, 205 y 125 pb) se determinó en 51.7% (15/29). Finalmente, el patrón IIb (550, 350 y 125 pb) representó 13.8% (4/29) aislados. El microagregado IIb se observó con predominio en aislados de HTLV-I del municipio de Tumaco. Los patrones I y IIa se distribuyeron con mayor frecuencia en el interior del suroccidente. Los resultados obtenidos muestran la existencia de un mecanismo de microevolución divergente de la región pol-env en los virus de las áreas analizadas.
ISSN:0120-8322