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Un sistema autorregulador de circuitos de retroalimentación de señalización interconectados controla el patrón de las
Jean-Denis Bénazet1, Mirko Bischofberger, Eva Tiecke
1Developmental Genetics, Department of Biomedicine, University of Basel, Mattenstrasse 28, CH-4058 Basel, Switzerland.
Science (New York, N.Y.)
|February 21, 2009
Resumen
Las vías de señalización de Sonic hedgehog (SHH) y el factor de crecimiento de fibroblastos (FGF) regulan el desarrollo de las extremidades. La proteína morfogenética ósea 4 (BMP4) inicia la señalización, que SHH luego propaga a través de Gremlin1 (GREM1) para controlar la formación de dígitos.
Área de la Ciencia:
- Biología del desarrollo Biología del desarrollo.
- Genética molecular genética molecular.
- Biología de sistemas Biología de sistemas.
Sus antecedentes:
- La embriogénesis se basa en una compleja señalización entre centros espacialmente distintos.
- El desarrollo de las extremidades implica circuitos de retroalimentación epitelio-mesenquimal (e-m), en particular la señalización de Sonic Hedgehog (SHH), el Factor de Crecimiento de Fibroblastos (FGF) y la Proteína Morfogénica Ósea (BMP).
- El papel de Gremlin1 (GREM1) en la mediación de estos bucles de retroalimentación es crucial, pero no está completamente aclarado.
Objetivo del estudio:
- Para aclarar los mecanismos reguladores de los bucles de retroalimentación e-m en el desarrollo de las extremidades.
- Comprender la interacción entre BMP4, SHH y GREM1 en el control de la especificación de dígitos.
- Investigar cómo estas vías de señalización forman una red de autorregulación para el desarrollo robusto de las extremidades.
Principales métodos:
- Utilizó la genética molecular del ratón para estudiar la regulación génica.
- Empleó el modelado matemático para analizar la dinámica de la señalización.
- Se investigó la regulación transcripcional diferencial de Grem1.
Principales resultados:
- La señalización BMP4 inicia la retroalimentación e-m, que posteriormente es propagada por SHH.
- Un mecanismo de conmutación enlaza un módulo BMP4/GREM1 rápido con un bucle SHH/GREM1/FGF más lento.
- Esta red interconectada asegura una regulación robusta del desarrollo distal de las extremidades, acomodando la variabilidad.
Conclusiones:
- El estudio revela un nuevo interruptor regulatorio en el desarrollo de las extremidades que involucra a BMP4 y SHH.
- Una red de señalización de autorregulación garantiza un control preciso de la especificación de los dígitos.
- La interconectividad entre las vías de señalización proporciona resiliencia y adaptabilidad en el desarrollo de las extremidades.
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