Double homeobox 4 messenger RNA (DUX4 mRNA)

DUX4 messenger RNA is the transcript of the double homeobox 4 gene, which encodes the DUX4 transcription factor. DUX4 mRNA arises almost exclusively from the most telomeric D4Z4 repeat on chromosome 4q35 due to the presence of a disease-permissive polyadenylation signal, permitting stable, polyadenylated transcripts in muscle cells. The full-length DUX4 mRNA (DUX4-FL) encodes a protein with two DNA-binding homeodomains and a C-terminal transcription activation domain; truncated isoforms exist but are generally non-pathogenic. Normally, DUX4 is expressed at low levels in embryonic cells, testis, and thymus; aberrant or ectopic expression in skeletal muscle leads to transcriptional activation of germline and stem cell gene programs, cell death, and is causative for facioscapulohumeral muscular dystrophy (FSHD). Therapeutic efforts target DUX4 mRNA via antisense or gene-silencing oligonucleotides, aiming to block formation of the pathogenic mRNA and prevent downstream gene dysregulation. No approved drugs directly interact with DUX4 mRNA, but gene-silencing technologies are in preclinical development. DUX4 mRNA expression serves as a critical biomarker for FSHD and aberrant muscle differentiation. The main safety concerns for targeting DUX4 mRNA involve risk of interfering with essential developmental expression, necessitating highly specific therapeutic strategies.

Other names

DUX4 mRNAD4Z4 transcription factor mRNADouble homeobox 4 mRNA

Antisense-mediated blocking of mRNA processing or polyadenylation, Inhibition of translation or destabilization of DUX4 mRNA