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Predecir los patrones evolutivos de los dientes de los mamíferos desde el desarrollo
Kathryn D Kavanagh1, Alistair R Evans, Jukka Jernvall
1Evolution & Development Unit, Institute of Biotechnology, PO Box 56 (Viikinkaari 9), FIN-00014 University of Helsinki, Finland. kathryn_kavanagh@yahoo.com
Nature
|September 28, 2007
Resumen
Los mecanismos de desarrollo controlan el tamaño y el número de molares del ratón. Un modelo de cascada inhibidora predice patrones de dentición de roedores, mostrando cómo la evolución favorece trayectorias de desarrollo específicas basadas en la dieta.
Área de la Ciencia:
- Biología del desarrollo Biología del desarrollo.
- Biología evolutiva Biología evolutiva.
- Paleontología Paleontología.
Sus antecedentes:
- Comprender la interacción entre los procesos de desarrollo y el cambio evolutivo es crucial.
- Los mecanismos que rigen el tamaño y el número de dientes de mejilla de mamíferos (molares) no se comprenden completamente.
Objetivo del estudio:
- Para aclarar cómo los procesos de desarrollo regulan el tamaño relativo y el número de molares en ratones.
- Construir y probar un modelo que prediga patrones evolutivos en la dentición de roedores.
Principales métodos:
- Investigación experimental de la lógica activador-inhibidor en el desarrollo secuencial de los dientes.
- Construcción de un modelo de cascada inhibitoria para el desarrollo molar.
- Análisis macroevolucionario para probar el poder predictivo del modelo en especies de roedores murinos.
Principales resultados:
- Se estableció un modelo de cascada inhibitoria, revelando la lógica del desarrollo secuencial de los dientes.
- Este mecanismo en cascada actúa como una restricción del desarrollo, asegurando que el segundo molar constituya consistentemente un tercio del área molar total.
- El modelo predijo con éxito patrones de dentición observados en varias especies de roedores con dietas diferentes.
Conclusiones:
- Las reglas de desarrollo se pueden construir y probar para la previsibilidad evolutiva en los sistemas naturales.
- El estudio proporciona un marco para comprender cómo las presiones ecológicas impulsan la evolución a lo largo de vías de desarrollo favorecidas.
- Los hallazgos destacan el papel de los mecanismos de desarrollo en la configuración de las trayectorias evolutivas, ejemplificado por los patrones molares de roedores.
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