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Las transposiciones genéticas en el complejo HoxD revelan una jerarquía de controles regulatorios
F van der Hoeven1, J Zákány, D Duboule
1Department of Zoology and Animal Biology, University of Geneva, Switzerland.
Cell
|June 28, 1996
Resumen
Los genes Hox de los vertebrados exhiben una activación temporal vinculada a su orden de agrupación. La reubicación de los genes Hoxd reveló elementos reguladores compartidos e interferencias nuevas, lo que sugiere que la regulación de alto orden mantiene la agrupación de genes Hox.
Área de la Ciencia:
- Biología del desarrollo Biología del desarrollo.
- Genética La genética.
- Biología Molecular Biología Molecular
Sus antecedentes:
- Los genes Hox de los vertebrados son cruciales para el desarrollo y están organizados en grupos.
- La activación génica dentro de los grupos de Hox suele seguir una secuencia temporal y espacial específica, que se correlaciona con su disposición lineal.
Objetivo del estudio:
- Investigar los mecanismos reguladores que rigen la activación del gen Hox.
- Para determinar el papel del orden genético y la ubicación dentro del complejo HoxD.
- Explorar cómo la reubicación de genes afecta los patrones de expresión y las interacciones reguladoras.
Principales métodos:
- Introducción de unidades de transcripción Hoxd etiquetadas con lacZ en una posición 5' ectópica dentro del complejo HoxD.
- Análisis de los patrones de expresión de genes reubicados en diferentes etapas de desarrollo.
- Examen de la expresión dependiente del locus en tejidos específicos como las extremidades y la eminencia genital.
Principales resultados:
- Los genes Hoxd reubicados mostraron una expresión temprana retrasada, imitando al vecino Hoxd-13.
- Las etapas posteriores revelaron la expresión dependiente del locus en las extremidades distales y la eminencia genital, lo que indica elementos reguladores compartidos.
- Los experimentos demostraron que los genes vecinos pueden compartir secuencias de acción cis y que la reubicación de genes causa nuevas interferencias regulatorias.
Conclusiones:
- Los mecanismos reguladores de alto orden controlan la activación del gen Hox.
- Se utilizan mecanismos reguladores comunes para múltiples genes Hox.
- El agrupamiento de genes se conserva debido a restricciones que incluyen secuencias cis-actuales compartidas e interferencias regulatorias.
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