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El complejo del comandante regula la función lisosómica y está implicado en el riesgo de enfermedad de Parkinson

Georgia Minakaki1, Nathaniel Safren1, Bernabe I Bustos1

  • 1Davee Department of Neurology, Northwestern University, Feinberg School of Medicine, Chicago, IL, USA.

Science (New York, N.Y.)
|April 10, 2025
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Resumen

Las variantes genéticas en GBA1 están relacionadas con la enfermedad de Parkinson (PD) y la demencia con cuerpos de Lewy (DLB). Los investigadores identificaron a COMMD3 como una proteína clave que influye en la actividad de la GCase y la función lisosómica, lo que sugiere nuevos objetivos terapéuticos para las enfermedades neurodegenerativas.

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Área de la Ciencia:

  • Neurogenética
  • Biología molecular
  • Biología celular

Sus antecedentes:

  • Las variantes genéticas en el gen GBA1, que conducen a una actividad reducida de la glucocerebrosidasa (GCasa), son factores de riesgo establecidos para la enfermedad de Parkinson (EP) y la demencia con cuerpos de Lewy (DLB).
  • La penetración incompleta observada en individuos con variantes de GBA1 indica la participación de otros factores genéticos en la manifestación de la EP y la DLB.

Objetivo del estudio:

  • Identificar nuevos modificadores genéticos de la actividad de las GCases y de la función lisosómica.
  • Investigar el papel de la proteína COMMD3 en la homeostasis lisosómica y su posible relación con las enfermedades neurodegenerativas.

Principales métodos:

  • Se utilizó una pantalla de interferencia CRISPR conjunta de todo el genoma para identificar genes que modifican la GCase y la actividad lisosómica.
  • El estudio incluyó el análisis de los efectos de la pérdida de COMMD3 en la liberación de proteínas lisosómicas y en la administración endolisosómica.

Principales resultados:

  • La proteína 3 (COMMD3) que contiene el dominio MURR1 del metabolismo del cobre fue identificada como un modificador de la GCasa y la actividad lisosómica.
  • La pérdida de la función de COMMD3 dio lugar a un aumento de la liberación extracelular de proteínas lisosómicas mediadas por las vesículas, lo que perjudicó la administración endolisosómica y causó una disfunción lisosómica.
  • Se encontró que las variantes raras dentro de la familia de genes Commander estaban asociadas con un riesgo elevado de EP.

Conclusiones:

  • Las proteínas COMMD y los complejos asociados juegan un papel crucial en el mantenimiento de la homeostasis lisosómica.
  • Estos hallazgos sugieren que los genes COMMD y sus complejos relacionados pueden actuar como modificadores en la enfermedad de Parkinson y otros trastornos neurodegenerativos caracterizados por disfunción lisosómica.