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Introducción y Características; Causa Genética y Función ABCA1; Herencia y Metabolismo HDL; Acumulación y Síntomas; Diagnóstico y Perspectivas Futuras

Enfermedad de Tangier

Química

Enfermedad de Tangier

Un trastorno genético raro del metabolismo lipídico.

Agenda

• Introducción y Características

• Causa Genética y Función ABCA1

• Herencia y Metabolismo HDL

• Acumulación y Síntomas

• Diagnóstico y Perspectivas Futuras

Enfermedad de Tangier

La Enfermedad de Tangier es un trastorno genético autosómico recesivo extremadamente raro, caracterizado por una deficiencia severa de lipoproteínas de alta densidad (HDL) en el plasma. Esta condición resulta de mutaciones en el gen ABCA1, afectando el transporte de colesterol de las células periféricas hacia las HDL.

Definición de la Enfermedad de Tangier

Características Bioquímicas Clave

Es un trastorno genético autosómico recesivo extremadamente raro. Se caracteriza por una deficiencia severa o ausencia de lipoproteínas de alta densidad (HDL) en el plasma. Esto se debe a mutaciones en el gen ABCA1.

La mutación ABCA1 impide el eflujo de colesterol de las células. Esto lleva a la acumulación de ésteres de colesterol en los tejidos. Se observa una marcada hipoalfalipoproteinemia y niveles bajos de colesterol total colesterol.

Causa Genética: Gen ABCA1

• Mutaciones en el gen ABCA1 son clave.

• Localizado en el cromosoma 9q31.

• Esencial para el transporte lipídico celular.

• Afecta la formación de HDL (colesterol bueno).

Proteína ABCA1: Función

ABCA1 es un transportador ABC crucial para el eflujo de colesterol y fosfolípidos desde las células. Cataliza el primer paso en la formación de HDL naciente, vital para el transporte inverso de colesterol. Su disfunción causa la Enfermedad de Tangier.

ABCA1: transportador clave de colesterol y fosfolípidos.

Eflujo de Colesterol: Rol de ABCA1

• ABCA1: transportador clave de colesterol y fosfolípidos.

• Moviliza lípidos de la célula a la apoA-I.

• Formación de HDL nacientes, protegiendo arterias.

• Deficiencia causa acumulación lipídica celular.

Herencia Autosómica Recesiva

Patrón de Transmisión

Se requieren dos copias del gen mutado (una de cada progenitor) para manifestar la enfermedad. Los individuos con una sola copia son portadores asintomáticos.

Gen ABCA1 y Riesgo

La Enfermedad de Tangier es causada por mutaciones en el gen ABCA1. Si ambos padres son portadores, cada hijo tiene un 25% de riesgo de padecerla.

Metabolismo HDL Afectado

La Enfermedad de Tangier interrumpe la ruta normal del HDL. La mutación en ABCA1 impide la salida de colesterol de las células, resultando en HDL muy bajo.

Formación HDL Nascente

La disfunción del transportador ABCA1 impide la eflujo de colesterol y fosfolípidos, crucial para la formación de HDL naciente. Esto afecta la captación eficiente de colesterol periférico, un aspecto central de la ateroprotección.

Enfermedad de Tangier

Introducción y Características; Causa Genética y Función ABCA1; Herencia y Metabolismo HDL; Acumulación y Síntomas; Diagnóstico y Perspectivas Futuras

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