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DUX4, a candidate gene of facioscapulohumeral muscular dystrophy, encodes a transcriptional activator of PITX1.

par Dixit, Manjusha;Ansseau, Eugénie ;Tassin, Alexandra;Winokur, Sara;Shi, Rongye;Qian, Hong;Sauvage, Sébastien ;Matteotti, Christel ;Van Acker, Anne Marie ;Leo, Oberdan ;Figlewicz, Denise;Barro, Marietta;Laoudj-Chenivesse, Dalila;Belayew, Alexandra ;Coppee, Frédérique ;Chen, Yi-Wen
Référence Proceedings of the National Academy of Sciences of the United States of America, 104, 46, page (18157-18162)
Publication Publié, 2007-11

Article révisé par les pairs

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Résumé :

Facioscapulohumeral muscular dystrophy (FSHD) is an autosomal dominant disorder linked to contractions of the D4Z4 repeat array in the subtelomeric region of chromosome 4q. By comparing genome-wide gene expression data from muscle biopsies of patients with FSHD to those of 11 other neuromuscular disorders, paired-like homeodomain transcription factor 1 (PITX1) was found specifically up-regulated in patients with FSHD. In addition, we showed that the double homeobox 4 gene (DUX4) that maps within the D4Z4 repeat unit was up-regulated in patient myoblasts at both mRNA and protein level. We further showed that the DUX4 protein could activate transient expression of a luciferase reporter gene fused to the Pitx1 promoter as well as the endogenous Pitx1 gene in transfected C2C12 cells. In EMSAs, DUX4 specifically interacted with a 30-bp sequence 5'-CGGATGCTGTCTTCTAATTAGTTTGGACCC-3' in the Pitx1 promoter. Mutations of the TAAT core affected Pitx1-LUC activation in C2C12 cells and DUX4 binding in vitro. Our results suggest that up-regulation of both DUX4 and PITX1 in FSHD muscles may play critical roles in the molecular mechanisms of the disease.