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El papel cambiante del salto par durante la evolución de la formación de patrones de insectos
N H Patel1, E E Ball, C S Goodman
1Howard Hughes Medical Institute, Department of Molecular and Cell Biology, University of California, Berkeley 94720.
Nature
|May 28, 1992
Resumen
El desarrollo de los insectos difiere entre los modos de banda germinal larga (Drosophila) y la banda germinal corta (grasshopper). El gen incluso omitido, crucial para la segmentación de Drosophila, no funciona como un gen de regla de pares en saltamontes, revelando distintas vías de desarrollo.
Área de la Ciencia:
- Biología del desarrollo Biología del desarrollo.
- Biología del desarrollo evolutivo Biología del desarrollo evolutivo
- Genética La genética.
Sus antecedentes:
- El desarrollo de los insectos exhibe diversos modos, incluida la banda germinal larga (por ejemplo, Drosophila) y la banda germinal corta (por ejemplo, saltamontes).
- El establecimiento del patrón de segmento difiere significativamente entre estos modos, observable a nivel molecular.
- El gen de polaridad del segmento engrailed y el gen homeótico abdominal-A muestran patrones de expresión distintos relacionados con el tipo de banda germinal.
Objetivo del estudio:
- Para investigar la base molecular de las diferencias en el desarrollo de la banda germinal de los insectos.
- Para caracterizar la función del homólogo del gen incluso omitido en el desarrollo de los saltamontes.
- Para comparar el papel del salto par en la segmentación temprana y la neurogénesis posterior en todos los grupos de insectos.
Principales métodos:
- Clonado del homólogo de saltamontes del gen de la regla de pareja de Drosophila incluso omitido.
- Análisis comparativo de los patrones de expresión génica durante el desarrollo embrionario.
- Estudios funcionales para evaluar el papel del salto par en la segmentación y la neurogénesis.
Principales resultados:
- El homólogo de saltos pares del saltamontes no funciona como un gen de regla de pareja durante la segmentación embrionaria temprana.
- A diferencia de la Drosophila, la expresión de saltos pares en los saltamontes no establece un patrón inicial de reglas de pareja.
- El gen incluso omitido conserva una función conservada en la neurogénesis tanto en Drosophila como en saltamontes.
Conclusiones:
- La función de regla de pareja de saltado par es específica de insectos de banda germinal larga como Drosophila.
- Los insectos de banda germinal corta utilizan mecanismos moleculares alternativos para la segmentación temprana.
- A pesar de las diferencias en el desarrollo temprano, existen roles conservados para el salto par en procesos de desarrollo posteriores como la neurogénesis.
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