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Interacción directa de la geminina y Six3 en el desarrollo del ojo

Filippo Del Bene¹, Kristin Tessmar-Raible, Joachim Wittbrodt

¹Developmental Biology Programme, EMBL, Meyerhofstrasse 1, 69012 Heidelberg, Germany.

|February 20, 2004

Resumen

El factor de transcripción Six3 y la geminina regulan antagónicamente el desarrollo del ojo de los vertebrados. La unión de Six3 a la geminina promueve la proliferación celular, crucial para la organogénesis.

Área de la Ciencia:

Biología del desarrollo Biología del desarrollo.
Biología Molecular Biología Molecular
Genética La genética.

Sus antecedentes:

La organogénesis de los vertebrados se basa en la proliferación celular controlada y la diferenciación.
El factor de transcripción homeobox Six3 es vital para la proliferación de las células precursoras de la retina.

Objetivo del estudio:

Para investigar la interacción entre Six3 y los gemelos.
Para aclarar los roles de Six3 y geminina en el desarrollo del ojo de los vertebrados.

Principales métodos:

Cribado de dos híbridos de levadura para identificar las interacciones de proteínas.
Estudios de sobreexpresión y inactivación de genes en el medaka (Oryzias latipes).
Análisis de los fenotipos de desarrollo del cerebro anterior y del ojo.

Principales resultados:

Six3 compite directamente con Cdt1 para unirse a la geminina, promoviendo la proliferación celular.
La sobreexpresión de Géminis causa defectos en el cerebro anterior y los ojos, rescatados por Six3.
La pérdida de Géminis mejora los seis fenotipos de ganancia de función, expandiendo las vesículas ópticas.

Conclusiones:

Six3 y geminina actúan antagónicamente para equilibrar la proliferación celular y la diferenciación.
Esta interacción es crítica para el desarrollo temprano del ojo de los vertebrados y la organogénesis.

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