Análisis filogenético y de presión evolutiva de secuencias nucleotídicas del gen VP4 de especies de enterovirus humanos

Alina Acosta Cabello, Graciela Russomando, Emilio E. Espínola

Resumen


El género Enterovirus es un grupo viral que afecta a un amplio rango de hospederos, entre ellos los humanos (especies A, B, C, y D), causan enfermedades respiratorias, gastrointestinales, neurológicas, y otras, y son altamente contagiosos. Los síntomas pueden ser leves o graves. El objetivo del trabajo fue analizar la variación nucleotídica, filogenética y de presión evolutiva de secuencias nucleotídicas del gen VP4 de las cuatro especies que afectan a los humanos. Se emplearon 92 secuencias nucleotídicas disponibles en la base de datos GenBank; éstas se editaron con el software BioEdit y se alinearon con Clustal W; las relaciones filogenéticas se determinaron con MEGA6, y las presiones evolutivas con los algoritmos SNAP y SLAC. Se encontró que la identidad nucleotídica mínima intra-especie fue de 43,2% (especie B) a 72,6% (especie D). Los genotipos más variables por especie fueron EV-71 (A), Echovirus 2 (B), EV-118 (C), y EV-94 (D). El análisis de presión evolutiva mostró que el gen VP4 en las cuatro especies evoluciona bajo presión selectiva negativa. Esto indicaría que la alta tasa mutacional y eventos de recombinación no tienen un rol significativo en la evolución de este gen, debido probablemente a la localización interna de la proteína VP4.

Palabras clave


Enterovirus humanos; secuencias nucleotídicas; gen VP4; análisis filogenético; presión selectiva

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Referencias


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