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A Reverse Genetic Approach to Test Functional Redundancy During Embryogenesis
Published on: August 11, 2010
Mantenimiento de la equivalencia funcional durante la evolución paralela del gen Hox
J M Greer1, J Puetz, K R Thomas
1Howard Hughes Medical Institute, University of Utah School of Medicine, Salt Lake City 84112, USA.
Nature
|February 25, 2000
Resumen
La duplicación de genes impulsa la diversidad biológica. Los genes Hoxa3 y Hoxd3 demuestran funciones idénticas, con niveles de expresión que determinan sus roles.
Área de la Ciencia:
- Biología evolutiva Biología evolutiva.
- Genética La genética.
- Biología molecular La biología molecular.
Sus antecedentes:
- La diversidad biológica surge de la duplicación genética, la mutación y la selección, lo que lleva a la divergencia funcional.
- El complejo de genes Hox de los mamíferos, que comprende 39 genes en 4 cromosomas, evolucionó a través de eventos de amplificación genética y duplicación.
- Los genes Hox transparalógicos, ubicados en posiciones cromosómicas similares, exhiben una mayor similitud de secuencia y expresión.
Objetivo del estudio:
- Investigar la relación funcional entre los genes Hox parálogos, específicamente Hoxa3 y Hoxd3.3.
- Para determinar si las diferencias en los roles de los genes atribuidos resultan de variaciones en el nivel de expresión.
Principales métodos:
- Análisis comparativo de las secuencias de genes Hoxa3 y Hoxd3 y patrones de expresión.
- Estudios funcionales en organismos modelo (implicados, por ejemplo, ratones) para evaluar las capacidades del producto genético.
Principales resultados:
- Las proteínas codificadas por Hoxa3 y Hoxd3 pueden realizar funciones biológicas idénticas.
- Las diferencias observadas en los roles de Hoxa3 y Hoxd3 son atribuibles a diferencias cuantitativas en la expresión génica.
Conclusiones:
- Los genes Hox paralelos poseen redundancia funcional inherente.
- La expresión génica diferencial modula cuantitativamente las funciones biológicas de los genes Hox, en lugar de alterar sus capacidades fundamentales.
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