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hnRNP A1 and A/B Interaction with PABPN1 in Oculopharyngeal Muscular Dystrophy

  • Xueping Fan (a1), Christiane Messaed (a1), Patrick Dion (a1), Janet Laganiere (a1), Bernard Brais (a2), George Karpati (a3) and Guy A. Rouleau (a1)...

Abstract

Background:

Oculopharyngeal muscular dystrophy (OPMD) is an adult-onset disorder characterized by progressive ptosis, dysphagia and proximal limb weakness. The autosomal dominant form of this disease is caused by short expansions of a (GCG)6 repeat to (GCG)8-13 in the PABPN1 gene. The mutations lead to the expansion of a polyalanine stretch from 10 to 12-17 alanines in the N-terminus of PABPN1. The mutated PABPN1 (mPABPN1) induces the formation of intranuclear filamentous inclusions that sequester poly(A) RNA and are associated with cell death.

Methods:

Human fetal brain cDNA library was used to look for PABPN1 binding proteins using yeast two-hybrid screen. The protein interaction was confirmed by GST pull-down and co-immunoprecipitation assays. Oculopharyngeal muscular dystrophy cellular model and OPMD patient muscle tissue were used to check whether the PABPN1 binding proteins were involved in the formation of OPMD intranuclear inclusions.

Results:

We identify two PABPN1 interacting proteins, hnRNP A1 and hnRNP A/B. When co-expressed with mPABPN1 in COS-7 cells, predominantly nuclear protein hnRNP A1 and A/B co-localize with mPABPN1 in the insoluble intranuclear aggregates. Patient studies showed that hnRNP A1 is sequestered in OPMD nuclear inclusions.

Conclusions:

The hnRNP proteins are involved in mRNA processing and mRNA nucleocytoplasmic export, sequestering of hnRNPs in OPMD intranuclear aggregates supports the view that OPMD intranuclear inclusions are “poly(A) RNA traps”, which would interfere with RNA export, and cause muscle cell death.

RÉSUMÉ: Introduction:

La dystrophie musculaire oculopharyngée (DMOP) est une maladie de l’âge adulte caractérisée par une ptose progressive des paupières, une dysphagie et une faiblesse musculaire proximale. La forme autosomique dominante est causée par de courtes expansions d’une répétition (GCG)6 à (GCG)8-13 dans le gene PABPN1. Les mutations donnent lieu à une expansion d’un tractus de polyalanine de 10 à 12-17 alanines dans la partie N-terminale de PABPN1. Le gène PABPN1 muté (PABPN1m) induit la formation d’inclusions filamenteuses intranucléaires qui séquestrent l’ARN poly(A) et entraînent la mort cellulaire.

Méthodes:

Une librairie d’ADNc provenant de cerveau foetal humain a été utilisée pour chercher la protéine liant PABPN1 au moyen du système à double-hybrides dans la levure. L’interaction protéine-protéine a été confirmée par GST pull-down et co-immunoprécipitation. Le modèle cellulaire de DMOP et le tissu musculaire provenant de patients atteints DMOP ont été utilisés pour vérifier si les protéines liant PABPN1 étaient impliquées dans la formation des inclusions intranucléaires dans la DMOP.

Résultats:

Nous avons identifié deux protéines interagissant avec PABPN1, hnRNP A1 et hnRNP A/B. En co-expression avec PABPN1m dans des cellules COS-7, les protéines hnRNP A1 et A/B à prédominance nucléaire se retrouvent avec PABPN1m dans les agrégats intranucléaires insolubles. Des études chez les patients atteints de DMOP ont montré que hnRNP A1 est séquestré dans les inclusions nucléaires.

Conclusions:

Les protéines hnRNP sont impliquées dans la maturation de l’ARNm et le transport nucléocytoplasmique de l’ARNm. La séquestration de hnRNPs dans les agrégats intranucléaires appuie l’hypothèse selon laquelle les inclusions intranucléaires de la DMOP sont des “piètes à ARN poly(A)” qui interfèrent avec le transport de l’ARN et causent la mort des cellules musculaires.

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