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Q9UBX2

Double homeobox protein 4 (Q9UBX2)

Uniprot ID Q9UBX2
Protein Name Double homeobox protein 4
Gene Name DUX4
Species Homo sapiens (Human)
Basic Information Experiments (0) Disease (0) Interactions
Signal peptide(a) N Secretome P(b)
Function [Isoform 1]: Transcription factor that is selectively and transiently expressed in cleavage-stage embryos (PubMed:28459457). Binds to double-stranded DNA elements with the consensus sequence 5'-TAATCTAATCA-3' (PubMed:28459457, PubMed:28459454, PubMed:29572508, PubMed:30540931, PubMed:30315230). Binds to chromatin containing histone H3 acetylated at 'Lys-27' (H3K27ac) and promotes deacetylation of H3K27ac. In parallel, binds to chromatin that lacks histone H3 acetylation at 'Lys-27' (H3K27ac) and recruits EP300 and CREBBP to promote acetylation of histone H3 at 'Lys-27' at new sites (PubMed:26951377). Involved in transcriptional regulation of numerous genes, primarily as transcriptional activator, but mediates also repression of a set of target genes (PubMed:17984056, PubMed:27378237, PubMed:26951377, PubMed:28459457, PubMed:28459454, PubMed:29618456, PubMed:30540931, PubMed:29572508). Promotes expression of ZSCAN4 and KDM4E, two proteins with essential roles during early embryogenesis (PubMed:27378237, PubMed:26951377, PubMed:28459457, PubMed:29618456). Heterologous expression in cultured embryonic stem cells mediates also transcription of HERVL retrotransposons and transcripts derived from ACRO1 and HSATII satellite repeats (PubMed:28459457). May activate expression of PITX1 (PubMed:17984056). May regulate microRNA (miRNA) expression (PubMed:24145033). Inappropriate expression can inhibit myogenesis and promote apoptosis (PubMed:26951377, PubMed:28935672, PubMed:29618456). .[Isoform 2]: Probably inactive as a transcriptional activator, due to the absence of the C-terminal region that is important for transcriptional activation. Can inhibit transcriptional activation mediated by isoform 1. Heterologous expression of isoform 2 has no deleterious effect on cell survival. {ECO:0000269|PubMed:29618456}.
GO - Molecular function
  • DNA-binding transcription activator activity, RNA polymerase II-specific : IDA:UniProtKB
  • RNA polymerase II cis-regulatory region sequence-specific DNA binding : IDA:NTNU_SB
  • sequence-specific double-stranded DNA binding : IDA:UniProtKB
  • transcription regulatory region sequence-specific DNA binding : IDA:UniProtKB
GO - Biological process
  • apoptotic process : IDA:UniProtKB
  • multicellular organism development : IEA:UniProtKB-KW
  • negative regulation of cell population proliferation : IMP:UniProtKB
  • negative regulation of G0 to G1 transition : IDA:UniProtKB
  • positive regulation of transcription by RNA polymerase II : IDA:UniProtKB
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(a) The Signal peptide D-score cutoff for "YES"(having signal peptide) is 0.45.
(b) Non-classically secreted proteins should obtain an NN-score(Neural Networks score) exceeding the normal threshold of 0.5, but not at the same time be predicted to contain a signal peptide.