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Mutaciones somáticas en el gen de la neurofibromatosis 1 en tumores humanos
1Department of Human Genetics, University of Utah School of Medicine, Salt Lake City 84112.
Cell
|April 17, 1992
Resumen
Las mutaciones en el gen de la neurofibromatosis 1 (NF1) pueden conducir a tumores. Una mutación específica de NF1, alterando Lys-1423 en la proteína neurofibromina, perjudica su función supresora de tumores, contribuyendo a varios tipos de cáncer.
Área de la Ciencia:
- Oncología Oncología.
- Biología Molecular Biología Molecular
- Genética La genética.
Sus antecedentes:
- La neurofibromatosis 1 (NF1) es causada por mutaciones en el gen NF1, que codifica la neurofibromina.
- El dominio relacionado con la proteína activadora de la GTPasa (GAP) de la neurofibromina (NF1 GRD) regula la p21ras, un factor clave en el crecimiento y la diferenciación celular.
- La desregulación de las vías de señalización ras debido a la neurofibromina mutante está implicada en el desarrollo de tumores.
Objetivo del estudio:
- Para investigar las consecuencias funcionales de una sustitución específica de aminoácidos (Lys-1423) en el NF1 GRD.
- Para determinar si esta mutación contribuye al desarrollo de tumores en pacientes con NF1 y tumores esporádicos.
Principales métodos:
- Análisis de la actividad de la proteína activadora de la GTPasa (GAP) del NF1 GRD.
- Evaluación de la afinidad de unión del mutante NF1 GRD a p21ras.
- Examen de muestras tumorales para detectar la presencia de la mutación Lys-1423 .
Principales resultados:
- Se identificó una sustitución específica de aminoácidos (Lys-1423) en el NF1 GRD.
- El mutante NF1 GRD exhibió una actividad GAP significativamente reducida (200-400 veces menor) en comparación con el tipo silvestre.
- Esta mutación se encontró en el adenocarcinoma de colon, el síndrome mielodisplásico, el astrocitoma anaplásico y en una familia con neurofibromatosis 1.
- La afinidad de unión del mutante NF1 GRD a p21ras no se vio afectada.
Conclusiones:
- Las mutaciones de la línea germinal NF1 que causan la neurofibromatosis 1 también pueden surgir somáticamente.
- La mutación identificada en el NF1 GRD perjudica su función supresora del tumor.
- Esta mutación somática contribuye al desarrollo de tumores esporádicos, incluidos los que no están típicamente asociados con NF1.1.
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