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Generación de patrones espaciales a través de la conmutación de la polaridad celular.

Sarah Robinson¹, Pierre Barbier de Reuille, Jordi Chan

¹John Innes Centre, Norwich Research Park, Colney, Norwich NR4 7UH, UK.

Science (New York, N.Y.)

|September 10, 2011

Resumen

El desarrollo de las plantas se basa en patrones espaciales precisos. Este estudio revela cómo el mantenimiento del factor de transcripción SPEECHLESS (SPCH) en las células hijas controla el espaciamiento estomático, guiando el patrón de tejido a través del cambio de polaridad.

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Área de la Ciencia:

Biología del desarrollo Biología del desarrollo.
La ciencia de las plantas es la ciencia de las plantas.
Biología celular Biología celular.

Sus antecedentes:

Comprender los patrones espaciales dinámicos en los tejidos proliferantes es un desafío debido a las complejas interacciones celulares.
El espaciado estomático en las plantas proporciona un sistema modelo, ya que las células no se reorganizan durante el desarrollo.

Objetivo del estudio:

Aclarar los mecanismos que rigen el espaciamiento estomático y los patrones de desarrollo en las plantas.
Investigar el papel del factor de transcripción SPEECHLESS (SPCH) en el comportamiento de las células madre y la progresión del linaje.

Principales métodos:

Seguimiento longitudinal de linajes celulares y actividad génica.
Modelado computacional de la división celular y la dinámica de polaridad.
Validación experimental de las predicciones de modelos para determinantes de polaridad como BASL.

Principales resultados:

El comportamiento limitado de las células madre en los precursores estomales depende del mantenimiento de SPEECHLESS (SPCH) en células hijas únicas.
Un mecanismo de cambio de polaridad postmitótico explica la formación estereotípica del linaje estomático.
El modelo predice con precisión la localización del determinante de polaridad BASL a través de múltiples divisiones celulares.

Conclusiones:

El estudio revela un nuevo mecanismo para generar patrones espaciales en los tejidos vegetales.
Las interacciones dinámicas y bidireccionales entre las células madre y su entorno son cruciales para el patrón de desarrollo.
Los hallazgos ofrecen información sobre los principios fundamentales de la determinación del destino celular y la organización de los tejidos.