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Efectos pleiotrópicos de una mutación nula en el c-fos proto-oncogénico
R S Johnson1, B M Spiegelman, V Papaioannou
1Dana-Farber Cancer Institute, Harvard Medical School, Boston, Massachusetts 02115.
Cell
|November 13, 1992
Resumen
El proto-oncogén c-fos es crucial para el desarrollo y la función en múltiples tejidos. Los mutantes homocigotos exhiben osteopetrosis severa y defectos de desarrollo, pero pueden sobrevivir hasta la edad adulta.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- Biología del desarrollo Biología del desarrollo.
- Genética La genética.
Sus antecedentes:
- El proto-oncogén c-fos juega un papel clave en las respuestas celulares a estímulos externos.
- Comprender la función de c-fos es vital para comprender los procesos de desarrollo y las enfermedades.
Objetivo del estudio:
- Investigar la función in vivo del c-fos durante el desarrollo embrionario y la vida postnatal.
- Caracterizar las consecuencias fenotípicas de la deficiencia de c-fos en ratones.
Principales métodos:
- Generación de ratones quiméricos con mutaciones c-fos dirigidas utilizando células madre embrionarias.
- Transmisión de la línea germinal y análisis de ratones homocigotos mutantes c-fos.
- Caracterización fenotípica que incluye crecimiento, desarrollo esquelético y función de órganos.
Principales resultados:
- Los mutantes homocigotos c-fos muestran una reducción del peso placentario y fetal, con una alta mortalidad perinatal.
- Los mutantes sobrevivientes desarrollan osteopetrosis severa, caracterizada por osificación ósea y erupción dental deteriorada.
- Los defectos adicionales incluyen la gametogénesis retardada, linfopenia y alteración del comportamiento, sin embargo, muchos sobreviven hasta la edad adulta.
Conclusiones:
- El c-fos es esencial para el desarrollo y la función adecuados de tejidos específicos, no es ampliamente requerido para el crecimiento celular.
- La osteopetrosis y otras anomalías del desarrollo resaltan el papel crítico de c-fos en el desarrollo del esqueleto y el sistema inmunológico.
- El estudio subraya las funciones complejas y específicas del tejido de c-fos en el desarrollo de los mamíferos.
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