Canine DUXC: implications for DUX4 retrotransposition and preclinical models of FSHD.

Mis-expression of DUX4 in skeletal muscle causes facioscapulohumeral muscular dystrophy (FSHD). Human DUX4 and mouse Dux are retrogenes derived from retrotransposition of the mRNA from the parental DUXC gene. Primates and rodents have lost the parental DUXC gene, and it is unknown whether DUXC had a similar role in driving an early pluripotent transcriptional program.

Conservation and innovation in the DUX4-family gene network.

Facioscapulohumeral dystrophy (FSHD; MIM158900, MIM158901) is caused by misexpression of the DUX4 transcription factor in skeletal muscle. Animal models of FSHD are hindered by incomplete knowledge regarding the conservation of the DUX4 transcriptional program in other species. Despite the divergence of their binding motifs, both mouse DUX and human DUX4 in mouse and human muscle cells, respectively, activate genes associated with cleavage-stage embryos, including MERVL and ERVL-MaLR retrotransposons.