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Glicosilación de proteínas: mutación de la chaperona en el síndrome de Tn
Tongzhong Ju1, Richard D Cummings
1Department of Biochemistry and Molecular Biology, and Oklahoma Center for Medical Glycobiology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma 73104, USA.
Nature
|October 28, 2005
Resumen
El síndrome de Tn, un raro trastorno autoinmune, es causado por mutaciones somáticas en el gen Cosmc. Este defecto afecta la actividad de la T-sintasa, lo que lleva a la producción del antígeno Tn anormal en las células sanguíneas.
Área de la Ciencia:
- La bioquímica es la bioquímica.
- Inmunología Inmunología.
- Genética La genética.
Sus antecedentes:
- El síndrome de Tn es una enfermedad autoinmune rara caracterizada por un antígeno Tn anormal en las células sanguíneas.
- El antígeno Tn es una forma truncada del antígeno T, que difiere en su glicosilación terminal.
- Se supone que este defecto es el resultado de un mal funcionamiento de la enzima glucosiladora, la T-sintasa.
Objetivo del estudio:
- Para investigar la base genética del síndrome de Tn.
- Para identificar el defecto molecular específico responsable del antígeno Tn anormal.
- Explorar las implicaciones de este hallazgo para otros trastornos relacionados.
Principales métodos:
- Análisis de mutación somática análisis de mutación somática
- Secuenciación genética de Cosmc.
- Análisis de las glicoproteínas.
Principales resultados:
- El síndrome de Tn está asociado con mutaciones somáticas en Cosmc, un gen en el cromosoma X.
- Cosmc codifica una chaperona molecular esencial para el plegamiento y la actividad de la T-sintasa.
- Cosmc defectuoso conduce a una función deteriorada de la T-sintasa y la producción del antígeno Tn autoinmune.
Conclusiones:
- Las mutaciones somáticas en Cosmc son la causa del síndrome de Tn.
- El chaperón Cosmc es crítico para la actividad de la T-sintasa.
- Comprender este mecanismo puede arrojar luz sobre otros trastornos relacionados con Tn como la nefropatía IgA.
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