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El co-chaperone Hsp40 DNAJC7 regula la agregación de poliglutamina y exhibe efectos dependientes del contexto en la
Biswarathan Ramani1, Kean Ehsani1, Martin Kampmann2
1Department of Pathology, University of California, San Francisco, San Francisco, CA, USA.
The Journal of biological chemistry
|February 18, 2026
Resumen
Los investigadores desarrollaron nuevos modelos celulares para estudiar la agregación de proteínas en enfermedades de poliglutamina (polyQ) y poliglicina (polyG). El co-chaperone Hsp40 DNAJC7 fue identificado como un supresor clave de la agregación de polyQ y también impacta la agregación de polyG.
Área de la Ciencia:
- Neurociencia
- Biología Molecular
- Genética
Sus antecedentes:
- Las enfermedades de expansión de repeticiones de nucleótidos codificantes de proteínas como la poliglutamina (polyQ) y la poliglicina (polyG) están relacionadas con proteínas mal plegadas y agregadas.
- Las chaperonas moleculares se están investigando por su potencial para suprimir los fenotipos de la enfermedad en estas condiciones.
Objetivo del estudio:
- Establecer modelos escalables basados en células para evaluar sistemáticamente los modificadores genéticos de la agregación de proteínas tanto en enfermedades de polyQ como de polyG.
- Identificar chaperonas moleculares y co-chaperonas novedosas que regulan la agregación de proteínas asociadas a enfermedades.
Principales métodos:
- Desarrollo de sistemas reporteros basados en la Transferencia de Energía de Resonancia de Förster (FRET) para modelar la agregación de polyQ y polyG en células humanas.
- Pantallas de interferencia CRISPR (CRISPRi) de alto rendimiento dirigidas a todas las chaperonas moleculares conocidas.
- Análisis de las interacciones de las chaperonas y sus efectos en la agregación de proteínas.
Principales resultados:
- Las pantallas CRISPRi identificaron las chaperonas Hsp70 y las co-chaperonas Hsp40 como modificadores de la agregación de polyQ.
- DNAJC7, una co-chaperona Hsp40, fue identificada como un supresor novedoso y potente de la agregación de polyQ.
- Mientras que DNAJC7 no afectó significativamente la agregación de polyG tras la reducción, su sobreexpresión redujo la agregación de polyQ y polyG y se co-localizó con los agregados.
Conclusiones:
- Establecidos nuevos modelos celulares inducibles y escalables para estudiar la agregación de polyQ y polyG.
- Ampliado el papel conocido de DNAJC7 en la regulación del plegamiento y la agregación de proteínas asociadas a enfermedades.
- Resaltada la participación diferencial de las chaperonas en las vías de agregación de polyQ frente a polyG.
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