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La coloración periódica en las aves se forma a través de un patrón previo de origen somita
Nicolas Haupaix1, Camille Curantz1, Richard Bailleul1
1Center for Interdisciplinary Research in Biology, CNRS 7241, INSERM U1042, Collège de France, Paris, France.
Science (New York, N.Y.)
|September 22, 2018
Resumen
Los patrones de pelaje de los animales como rayas se forman en un proceso de dos pasos. Las primeras señales de desarrollo de la somita establecen la posición de las rayas, seguidas de la regulación génica que controla el ancho de las rayas, revelando una nueva comprensión de la formación de patrones.
Área de la Ciencia:
- Biología del desarrollo
- Biología evolutiva
- La genética
Sus antecedentes:
- Los patrones de pelaje de los animales (rayas, manchas) a menudo se consideran auto-organizados, que surgen de la dinámica de reacción-difusión.
- El papel de la información posicional preexistente en la periodicidad y orientación de los patrones sigue sin estar claro.
Objetivo del estudio:
- Investigar los mecanismos de desarrollo subyacentes a la formación de patrones de rayas periódicas en el pelaje animal.
- Determinar si la información posicional temprana influye en la formación de patrones de rayas aguas arriba de la dinámica local.
Principales métodos:
- Utilizó la variación natural en las rayas de color de las aves galliformes juveniles.
- Se analizaron los perfiles de expresión génica, centrándose específicamente en el papel del gen agouti.
- Investigó un proceso de dos pasos que involucra la señalización autónoma y la regulación genética dependiente de la dosis.
Principales resultados:
- La posición de la franja está determinada por la señalización autónoma de la somita, creando un patrón previo marcado por la expresión agouti.
- La expresión génica de Agouti regula el ancho de la franja a través del control dependiente de la dosis de la producción de pigmento.
- Demostró que los primeros hitos de desarrollo preceden e influyen en las dinámicas de patrones locales posteriores.
Conclusiones:
- La formación de rayas en el pelaje de los animales es un proceso de dos pasos que implica información posicional temprana y posterior regulación génica.
- Las primeras señales de desarrollo dan forma a los patrones periódicos, limitando su potencial evolutivo.
- Desafía la visión de los patrones de pelaje únicamente como sistemas auto-organizados, destacando el papel de la historia del desarrollo.
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