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Propiedades genéticas que influyen en la evolución de la expresión génica
Christian R Landry1, Bernardo Lemos, Scott A Rifkin
1Department of Organismic and Evolutionary Biology, Harvard University, 16 Divinity Avenue, Cambridge, MA 02138, USA. clandry@post.harvard.edu
Science (New York, N.Y.)
|May 26, 2007
Resumen
La sensibilidad de la expresión génica a las mutaciones está influenciada por la estructura génica y la presencia de la caja TATA. Esta sensibilidad impacta la capacidad de evolución y la respuesta a los cambios ambientales, cruciales para comprender la evolución de la regulación.
Área de la Ciencia:
- Biología evolutiva Biología evolutiva.
- Genética molecular genética molecular.
- Biología de sistemas Biología de sistemas.
Sus antecedentes:
- Comprender la evolución de la red de genes es clave.
- La variación natural por sí sola es insuficiente para inferir modos evolutivos debido a interacciones complejas con la selección, la demografía y las tasas de mutación.
Objetivo del estudio:
- Para estimar el impacto de las mutaciones naturales en la expresión génica.
- Minimizar la influencia de la selección natural en estas estimaciones.
- Establecer una base mecanicista para la evolución de la expresión génica.
Principales métodos:
- Estimación de los efectos de mutación de origen natural en la expresión génica.
- Minimización de la influencia de la selección natural durante la estimación del efecto de la mutación.
Principales resultados:
- La sensibilidad de la expresión génica a las mutaciones aumenta con el tamaño del objetivo transmutacional.
- La presencia de una caja TATA mejora la sensibilidad de la expresión génica a las mutaciones.
- Los genes más sensibles a las mutaciones también exhiben una mayor sensibilidad a las perturbaciones ambientales y al ruido estocástico.
Conclusiones:
- La sensibilidad de la expresión génica a las mutaciones está mecanicamente relacionada con la estructura génica (caja TATA) y el tamaño (objetivo transmutacional).
- Esta sensibilidad es un predictor de la respuesta de un gen a los factores ambientales y al ruido.
- Los hallazgos proporcionan una base para el desarrollo de modelos realistas de la evolución regulatoria y la evolución de la red génica.
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