Double homeobox, 4 also known as DUX4 is a protein which in humans is encoded by the DUX4 gene. Its misexpression is the cause of facioscapulohumeral muscular dystrophy (FSHD). The DUX4 protein is a transcriptional activator of many genes, one example being paired-like homeodomain transcription factor 1 (PITX1). It likely stimulates zygotic genome activation. The two homeodomains allow DUX4 protein to bind to DNA. The C-terminal domain is involved in target gene activation. DUX is normally expressed in the testes, thymus, and cleavage-stage embryos.
Background References
1. Mocciaro E et al. DUX4 Role in Normal Physiology and in FSHD Muscular Dystrophy. Cells. 2021 Nov
2. Bakewell J et al. DUX4-rearranged B-ALL: deciphering a biological and clinical conundrum. Leukemia. 2025 Dec
Western blot analysis of DUX4 on different lysates with Rabbit anti-DUX4 antibody (HA724165) at 1/1,000 dilution.
Lane 1: HeLa cell lysate (20 µg/Lane) Lane 2: HepG2 cell lysate (20 µg/Lane) Lane 3: Mouse testis tissue lysate (40 µg/Lane)
Predicted band size: 45 kDa Observed band size: 45 kDa
Exposure time: 3 minutes; ECL: K1801;
4-20% SDS-PAGE gel.
Proteins were transferred to a PVDF membrane and blocked with 5% NFDM/TBST for 1 hour at room temperature. The primary antibody (HA724165) at 1/1,000 dilution was used in 5% NFDM/TBST at 4℃ overnight. Goat Anti-Rabbit IgG - HRP Secondary Antibody (HA1001) at 1/50,000 dilution was used for 1 hour at room temperature.
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