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Participación de los genes Notch y Delta en la segmentación de arañas
Angelika Stollewerk1, Michael Schoppmeier, Wim G M Damen
1Institute of Genetics, Evolutionary Genetics, University of Cologne, Köln, Germany.
Nature
|June 20, 2003
Resumen
La segmentación en animales puede compartir un origen común. Las similitudes en la participación de los genes Notch y Delta en la segmentación de arañas y vertebrados sugieren un antiguo programa genético compartido para la formación de segmentos corporales.
Área de la Ciencia:
- Biología del desarrollo Biología del desarrollo.
- Biología evolutiva Biología evolutiva.
- Genética La genética.
Sus antecedentes:
- Se debate el origen evolutivo de la segmentación animal y sus mecanismos genéticos subyacentes.
- Las distintas redes genéticas en artrópodos (por ejemplo, insectos) y vertebrados sugieren caminos evolutivos separados para la segmentación.
- La vía Notch es crucial para la segmentación de los vertebrados, pero no para la segmentación de los insectos.
Objetivo del estudio:
- Para investigar el papel de la vía de Notch en la segmentación de la araña Cupiennius salei.
- Para comparar los mecanismos de segmentación de las arañas con los de los vertebrados y los insectos.
- Para evaluar la hipótesis de un origen genético común para la segmentación a través de diferentes filos de animales.
Principales métodos:
- Analizando los patrones de expresión de los genes Notch y Delta en la araña Cupiennius salei.
- Utilizando la interferencia de ARN (RNAi) para estudiar la función génica durante la segmentación de arañas.
- Análisis comparativo de la expresión génica y los datos funcionales con el conocimiento existente de la segmentación de vertebrados e insectos.
Principales resultados:
- Los genes Notch y Delta están activamente involucrados en el proceso de segmentación de la araña Cupiennius salei.
- Los patrones de expresión y los resultados del RNAi revelan similitudes significativas entre la segmentación de la araña y la somitogénesis de los vertebrados.
- Las diferencias clave observadas en la segmentación de insectos pueden representar pérdidas o modificaciones genéticas específicas del linaje.
Conclusiones:
- Los hallazgos apoyan la hipótesis de que la segmentación de artrópodos y vertebrados comparten un ancestro genético común.
- La vía de señalización de Notch puede haber desempeñado un papel conservado en la segmentación de los antepasados de los primeros animales.
- La pérdida evolutiva o la divergencia de componentes genéticos específicos ha dado forma a la diversidad de segmentación en los filos animales.
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