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SHR y SCR coordinan el patrón de raíz y el crecimiento temprano en el ciclo celular
Cara M Winter1,2, Pablo Szekely3,4, Vladimir Popov5
1Department of Biology, Duke University, Durham, NC, USA. cara.winter@duke.edu.
Nature
|January 31, 2024
Resumen
Los factores de transcripción SHORTROOT (SHR) y SCARECROW (SCR) controlan el desarrollo de las raíces de las plantas. Sus niveles al principio del ciclo celular dictan la orientación de la división celular, coordinando el patrón de tejido y el crecimiento.
Área de la Ciencia:
- Biología del desarrollo vegetal
- Dinámica de las células
- Redes de regulación genética
Sus antecedentes:
- La división celular precisa es crucial para el desarrollo de organismos multicelulares.
- La coordinación entre las divisiones formativas (patrón) y proliferativas (crecimiento) sigue sin estar clara.
- SHORTROOT (SHR) y SCARECROW (SCR) son factores de transcripción clave para las divisiones formativas en las células madre de la raíz de Arabidopsis.
Objetivo del estudio:
- Investigar cómo las dinámicas SHR y SCR influyen en la orientación de la división celular.
- Comprender el mecanismo de coordinación entre la división celular, el patrón y el crecimiento.
- Desafiar los modelos existentes de la red reguladora de genes SHR-SCR.
Principales métodos:
- Utilizó una hoja de luz cuantitativa 4D y microscopía confocal para imágenes de alta frecuencia a largo plazo de la dinámica SHR y SCR en raíces vivas de Arabidopsis.
- Empleó un sistema de inducción SHR para manipular directamente los niveles del factor de transcripción.
- Orientación del plano de división celular analizado en respuesta a los niveles dinámicos de SHR y SCR.
Principales resultados:
- Los niveles de SHR y SCR al principio del ciclo celular determinan si la división celular es formativa o proliferativa.
- Las cinéticas observadas de SHR y SCR no apoyan un modelo de regulación génica bistable.
- Solo son necesarios niveles transitorios y bajos de SHR y SCR al principio del ciclo celular para las divisiones formativas.
Conclusiones:
- Los reguladores del desarrollo como SHR y SCR coordinan directamente el patrón de tejido y el crecimiento del organismo.
- Un nuevo mecanismo que involucra niveles de factores de transcripción dependientes del ciclo celular regula la orientación de la división celular.
- Los hallazgos proporcionan nuevos conocimientos sobre la regulación de los nichos de células madre y el desarrollo de las plantas.
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