DUX4 and Facioscapulohumeral dystrophy: While the Dixit et al. study [30] identified a poly-adenylated DUX4 mRNA only in FSHD muscle, the Snider et al. study [29] identified DUX4 mRNA and other RNA transcripts in skeletal muscle cells from both control and FSHD affected individuals, albeit at higher levels in FSHD samples.