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Updated: May 6, 2026

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Las mutaciones de KSR2 se asocian con la obesidad, la resistencia a la insulina y el deterioro de la oxidación del
Cell
|November 12, 2013
Resumen
Las variantes raras en el supresor de kinasa de Ras 2 (KSR2) causan obesidad severa al interrumpir el equilibrio energético y el metabolismo. La metformina puede ayudar mejorando la función celular en los portadores de la mutación.
Área de la Ciencia:
- Genética La genética.
- El metabolismo es el metabolismo.
- Biología Molecular Biología Molecular
Sus antecedentes:
- El supresor de kinasa de Ras 2 (KSR2) es una proteína de andamio intracelular implicada en la señalización celular.
- La deleción de Ksr2 en ratones resulta en obesidad, lo que indica su papel en la homeostasis energética.
Objetivo del estudio:
- Para investigar el papel de KSR2 en la obesidad humana.
- Para identificar las variantes genéticas en KSR2 asociadas con la obesidad severa de inicio temprano.
Principales métodos:
- Secuenciación de KSR2 en 2.101 individuos con obesidad severa de inicio temprano y 1.536 controles.
- Estudios funcionales en células transfectadas para evaluar el impacto de las variantes de KSR2 en las vías de señalización y la oxidación del sustrato.
- Evaluación clínica de los portadores de mutaciones para los fenotipos metabólicos.
Principales resultados:
- Se identificaron múltiples variantes raras de KSR2 en individuos con obesidad severa.
- Estas variantes interrumpen la vía Raf-MEK-ERK y perjudican la oxidación celular de ácidos grasos y glucosa.
- Los efectos fueron mejorados por la metformina en modelos celulares.
- Los portadores de la mutación mostraron hiperfagia, frecuencia cardíaca baja, tasa metabólica basal reducida y resistencia severa a la insulina.
Conclusiones:
- KSR2 es un regulador crítico de la ingesta de energía, el gasto y la utilización del sustrato en los seres humanos.
- La disfunción de KSR2 contribuye a la obesidad severa y la resistencia a la insulina.
- Dirigirse a las vías mediadas por KSR2 ofrece una estrategia terapéutica potencial para la obesidad y la diabetes tipo 2.
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