PCR en tiempo real (qPCR): una herramienta útil en el control del virus de la leucosis bovina (BLV) / Real-time PCR (qPCR): a useful tool in the control of bovine leukosis virus (BLV)
DOI:
https://doi.org/10.34188/bjaerv5n1-072Palavras-chave:
BLV, qPCR, carga proviral, citoquinas, control.Resumo
El virus de la leucosis bovina (BLV) es el agente etiológico de la leucosis enzoótica bovina (LEB), la enfermedad neoplásica más común del ganado bovino, caracterizada por presentar una expansión policlonal benigna de linfocitos B circulantes en sangre periférica durante los primeros años post-infección que puede progresar a un estado tumoral causando la muerte del animal, o mantenerse este estado pre-leucémico durante toda la vida del animal, generando una función inmunológica anormal. BLV infecta al ganado en todo el mundo, generando un impacto económico importante en la industria del ganado lechero. Desde principios de los `90, haciendo uso de técnicas hematológicas, se han clasificado los animales infectados con BLV en linfocitóticos (LP) o asintomáticos. Sin embargo, a partir de técnicas moleculares como la PCR, en las últimas décadas se han clasificado los animales infectados según su carga proviral, permitiendo distinguir dos grupos bien definidos donde todos los animales LP presentan alta carga proviral (ACPV), mientras que los animales asintomáticos pueden presentar ACPV o baja carga proviral (BCPV). Actualmente, diferentes variantes de PCR en tiempo real (qPCR) se han utilizado para determinar la carga proviral (cuantificación absoluta), así como también realizar estudios de expresión de genes involucrados en la respuesta inmune (cuantificación relativa) en los animales infectados. Haciendo uso de estas herramientas, hemos construido un perfil inmunológico de los animales de BCPV, a los que denominamos “controladores”, ya que logran controlar la infección a nivel sistémico y de glándula mamaria, siendo menos eficientes para transmitir el virus, y cuyas células presentan un estado pro-apoptótico y anti-proliferativo. Nuestros resultados sugieren que la determinación de la carga proviral del BLV por qPCR es una herramienta útil para monitorear la propagación de la infección, a ser utilizada como una medida de control eficiente y factible, reemplazando a los animales infectados que desarrollan ACPV por animales “controladores”.
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