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Evolución de un dominio de represión transcripcional en un insecto La proteína Hox de un insecto
1Howard Hughes Medical Institute, University of Wisconsin, Madison 53706, USA.
Nature
|February 23, 2002
Resumen
Los genes homeóticos (Hox) regulan los planes corporales de los animales. Un dominio de represión recientemente identificado en la proteína Ultrabithorax (Ubx) puede explicar la evolución de la diversidad de insectos.
Área de la Ciencia:
- Biología del desarrollo Biología del desarrollo.
- Biología evolutiva Biología evolutiva.
- Genética La genética.
Sus antecedentes:
- Los genes homeóticos (Hox) son cruciales para la regionalización del cuerpo animal.
- La evolución del gen Hox, incluida la duplicación, la divergencia y los cambios regulatorios, contribuye a la diversidad animal.
- La adquisición de nuevas actividades proteicas por las proteínas Hox durante la evolución sigue siendo en gran medida inexplorada.
Objetivo del estudio:
- Investigar si las proteínas Hox han adquirido nuevas funciones durante la evolución.
- Identificar nuevos dominios funcionales en las proteínas Hox y evaluar su conservación evolutiva.
- Explorar el papel potencial de estos dominios en la diversificación de la morfología animal.
Principales métodos:
- Identificación y caracterización de los dominios funcionales dentro de la proteína Drosophila Ultrabithorax (Ubx).
- Análisis comparativo de secuencias de ortólogos de Ubx en diferentes linajes de artrópodos y onicóforos.
- Ensayos funcionales para determinar la actividad de los dominios identificados.
Principales resultados:
- Se identificó un dominio de represión transcripcional en la región carboxiterminal de Drosophila Ubx.
- Este dominio de represión se conserva en los ortólogos Ubx de otros insectos.
- El dominio está ausente en las proteínas Ubx de los artrópodos no insectos y los onicóforos.
Conclusiones:
- La evolución del dominio de represión carboxiterminal en Ubx puede haber permitido una mayor diversificación morfológica en los insectos.
- Este hallazgo sugiere que los cambios en la función de la proteína Hox, más allá de los cambios en la regulación génica, contribuyen a la diversificación evolutiva.
- El estudio destaca la importancia de explorar la evolución a nivel de proteínas en la comprensión de la diversidad animal.
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