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Papel del translocator de nucleótidos de adenina 1 en el mantenimiento del ADNmt

J Kaukonen¹, J K Juselius, V Tiranti

¹National Public Health Institute, Department of Human Molecular Genetics, Mannerheimintie 166, 00300 Helsinki, Finland.

Science (New York, N.Y.)

|August 5, 2000

Resumen

Las mutaciones en el gen ANT1 causan oftalmoplegia externa progresiva autosómica dominante, una enfermedad de deleción del ADN mitocondrial. Este hallazgo revela un gen nuclear.

Área de la Ciencia:

Genética La genética.
Biología Molecular Biología Molecular
Biología mitocondrial Biología mitocondrial

Sus antecedentes:

La oftalmoplasia externa progresiva autosómica dominante es un trastorno mendeliano raro.
La enfermedad se caracteriza por deleciones a gran escala del ADN mitocondrial (ADNmt).
La causa genética subyacente no estaba clara hasta ahora.

Objetivo del estudio:

Para identificar el gen nuclear responsable de la oftalmoplegia externa progresiva autosómica dominante.
Para investigar el papel del gen translocator de nucleótidos de adenina (ANT1) en el mantenimiento del ADNmt.

Principales métodos:

Análisis genético de cinco familias y un paciente esporádico con la enfermedad.
Identificación y caracterización de mutaciones en el gen ANT1.
Estudios funcionales de la mutación análoga en la levadura.

Principales resultados:

Se identificaron dos mutaciones de mal sentido heterocigóticas en el gen nuclear ANT1.
Una mutación familiar (prolina para alanina en la posición 114) causó un defecto respiratorio en la levadura.
Estos hallazgos vinculan ANT1 al mantenimiento del ADNmt.

Conclusiones:

Las mutaciones en el gen ANT1 causan oftalmoplegia externa progresiva autosómica dominante.
ANT1 juega un papel crucial en el mantenimiento del ADNmt.
Las enfermedades mitocondriales pueden surgir de defectos genéticos nucleares dominantes.

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