Complejidad del proceso de integración sistémica de los lentivirus humanos

Felipe Garcia-Vallejo

Resumen


Introducción: La distribución del DNAc lentiviral en el genoma hospedero ha sido estudiada usando un enfoque estructural, sin embargo éste es incompleto pues no considera la dinámica y la topología de la cromatina interfásica y las redes de expresión de genes en la célula infectada.

Objetivo. Utilizando un enfoque no linear, correlacionar la multifractalidad de los cromosomas humanos con la composición y el disturbio de la topología de la cromatina como un efecto complejo promovido por la integración de ADNc lentiviral.

Métodos. De 2.409 secuencias genómicas obtenidas del GeneBank y flanqueantes al 5’LTR de lentivirus humanos, (cobertura mayor del 98,6% del genoma humano), se correlacionaron con los valores de multifractalidad (AvΔDq) de la cromatina humana. Adicionalmente se empleó el programa Cytoscape v.2.63 para simular computacionalmente los efectos de la integración sobre las redes de expresión de genes humanos.

Resultados. El 54,21% de la integración lentiviral ocurrió en aquellos cromosomas con valores altos e intermedios de multifractalidad; el 18.14% de estas integraciones se localizo en los cromosomas con más altos valores de multifractalidad (16, 17, 19, 22). La multifractalidad se correlacionó con el porcentaje Alu. Se registraron 2.770 interacciones entre 28 genes localizados cerca de provirus VIH-1 en macrófagos humanos. La integración del DNAc lentiviral alteró dramáticamente, la topología de la red de expresión de genes en macrófagos.

Conclusión. Algunos cambios topológicos asociados a las regiones con elevada frecuencia de integración del ADNc, podrían, de manera sinérgica, reconfigurar localmente la topología del ambiente cromatínica que las redes de expresión de genes en la célula infectada. © 2016. Acad. Colomb. Cienc. Ex. Fis. Nat. Todos los derechos reservados.


Palabras clave


Retrovirus; Cointegración retroviral; Linfocitos; Isla CpG; Genes clase II; Simulación computacional

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DOI: http://dx.doi.org/10.18257/raccefyn.364

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