Gene expression response to DUX4 in murine myoblasts
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ABSTRACT:
ORGANISM(S): Mus musculus
PROVIDER: GSE77100 | GEO | 2017/01/31
SECONDARY ACCESSION(S): PRJNA309433
REPOSITORIES: GEO
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Project description:Proteomic studies in facioscapulohumeral muscular dystrophy (FSHD) could offer new insight to disease mechanisms underpinned by post-transcriptional processes. We used stable isotope (deuterium oxide; D2O) labelling and peptide mass spectrometry to investigate the abundance and turnover rates of proteins in cultured muscle cells from 2 individuals affected by FSHD and their unaffected siblings (UASb). Cells were treated with or without MOE to silence DUX4
2023-06-27 | PXD042374 | Pride
Project description:DUX4 is a double homeodomain transcription factor whose misexpression in the muscle causes facioscapulohumeral muscular dystrophy (FSHD). The transcriptional activity of DUX4 has been extensively characterized, and is thought to be the primary driver of FSHD pathogenesis. Yet, DUX4 expression lowers the protein level of an RNA quality control factor, UPF1, without affecting its transcript level, hinting at post-transcriptional regulatory activity downstream of DUX4 expression. How extensive the post-transcriptional activity of DUX4 is, and how relevant it is to FSHD pathogenesis, is unknown. In order to gain insight into DUX4-induced post-transcriptional gene regulation, we measured transcript and protein levels in DUX4 expressing cells via RNA-seq and SILAC-based quantitative mass spectrometry, respectively. We show that DUX4 transcriptional targets are robustly translated, including those genes previously identified as potential FSHD biomarkers. However, comparing the overall pattern of gene expression changes for RNA versus protein reveals striking differences in the most highly activated pathways, with the former showing changes in RNA processing and splicing, and the latter affecting the humoral immune response, proteolysis and exocytosis, among other pathways. Consistent with a misregulation of exocytosis, fluorescence imaging shows fragmented golgi apparatus in DUX4-expressing cells. Of the genes that showed discordant RNA and protein expression levels, post-transcriptional buffering was particularly evident for genes involved in stress response and may explain why DUX4-expressing cells succumb to toxicity despite robust transcriptional activation of stress response genes. Moreover, several genes involved in RNA decay including UPF1, UPF3B, SMG6 and XRN1 showed downregulation at the protein level, which may explain the massive inhibition of RNA quality control in DUX4-expressing cells. These results highlight the importance of considering post-transcriptional gene regulation in DUX4-expressing cells in order to fully understand the FSHD disease process.
2019-01-21 | PXD010221 | Pride
Project description:The aim of this study is to define the molecular mechanisms underlying DUX4-associated toxicity in the context of facioscapulohumeral muscular dystrophy (FSHD). DUX4 is a transcription factor, which induces cell death by activating the transcription of its targets. No molecule able to directly control DUX4 activity is currently known. By using a tandem affinity purification protocol combined to mass spectrometry analysis, we identified Matrin 3 (MATR3), as the first cellular factor able to directly block DUX4 toxic activity. We found that MATR3 binds to the DNA binding domain of DUX4 blocking the activation of its genomic targets.
2023-08-21 | PXD011073 | Pride
Project description:Facioscapulohumeral dystrophy (FSHD) is one of the most common inherited muscular dystrophies. The causative gene remains controversial and the mechanism of pathophysiology unknown. Here we identify genes associated with germline and early stem cell development as targets of the DUX4 transcription factor, a leading candidate gene for FSHD. The genes regulated by DUX4 are reliably detected in FSHD muscle but not in controls, providing direct support for the model that misexpression of DUX4 is a causal factor for FSHD. Additionally, we show that DUX4 binds and activates LTR elements from a class of MaLR endogenous primate retrotransposons and suppresses the innate immune response to viral infection, at least in part through the activation of DEFB103, a human defensin that can inhibit muscle differentiation. These findings suggest specific mechanisms of FSHD pathology and identify candidate biomarkers for disease diagnosis and progression. Examine Dux4 full isoform binding sites in human fibroblast.
2012-01-03 | E-GEOD-33838 | biostudies-arrayexpress
Project description:Facioscapulohumeral dystrophy (FSHD) is one of the most common inherited muscular dystrophies. The causative gene remains controversial and the mechanism of pathophysiology unknown. Here we identify genes associated with germline and early stem cell development as targets of the DUX4 transcription factor, a leading candidate gene for FSHD. The genes regulated by DUX4 are reliably detected in FSHD muscle but not in controls, providing direct support for the model that misexpression of DUX4 is a causal factor for FSHD. Additionally, we show that DUX4 binds and activates LTR elements from a class of MaLR endogenous primate retrotransposons and suppresses the innate immune response to viral infection, at least in part through the activation of DEFB103, a human defensin that can inhibit muscle differentiation. These findings suggest specific mechanisms of FSHD pathology and identify candidate biomarkers for disease diagnosis and progression. [Overexpression experiment] Quadruplicate total RNA samples were collected from control human primary myoblasts transduced with lentivirus carrying DUX4-fl, DUX4-s or GFP (MOI = 15) for 24 h and from untransduced myoblasts. [Defensin experiment] Quadruplicate samples were also collected from myoblasts and myotubes grown in media containing human beta-defensin 3 peptide or in control media.
2012-01-03 | E-GEOD-33799 | biostudies-arrayexpress
Project description:Nonsense-mediated RNA decay (NMD) degrades transcripts carrying premature termination codons. NMD is thought to prevent the synthesis of toxic truncated proteins. However, whether loss of NMD results in widespread production of truncated proteins is unclear. A human genetic disease, facioscapulohumeral muscular dystrophy (FSHD), features acute inhibition of NMD upon expression of the disease-causing transcription factor, DUX4. Using a cell-based model of FSHD, we show production of truncated proteins from physiological NMD targets and find that RNA-binding proteins are enriched for aberrant truncations. The NMD isoform of one RNA-binding protein, SRSF3, is translated to produce a stable truncated protein, which is detected in FSHD patient-derived myotubes. Ectopic expression of truncated SRSF3 confers toxicity, and its downregulation is cytoprotective. Our results delineate the genome-scale impact of NMD loss. This widespread production of potentially deleterious truncated proteins has implications for FSHD biology as well as other genetic diseases where NMD is therapeutically modulated.
2021-06-29 | GSE178760 | GEO
Project description:Nonsense-mediated RNA decay (NMD) degrades transcripts carrying premature termination codons. NMD is thought to prevent the synthesis of toxic truncated proteins. However, whether loss of NMD results in widespread production of truncated proteins is unclear. A human genetic disease, facioscapulohumeral muscular dystrophy (FSHD), features acute inhibition of NMD upon expression of the disease-causing transcription factor, DUX4. Using a cell-based model of FSHD, we show production of truncated proteins from physiological NMD targets and find that RNA-binding proteins are enriched for aberrant truncations. The NMD isoform of one RNA-binding protein, SRSF3, is translated to produce a stable truncated protein, which is detected in FSHD patient-derived myotubes. Ectopic expression of truncated SRSF3 confers toxicity, and its downregulation is cytoprotective. Our results delineate the genome-scale impact of NMD loss. This widespread production of potentially deleterious truncated proteins has implications for FSHD biology as well as other genetic diseases where NMD is therapeutically modulated.
2021-06-29 | GSE178759 | GEO
Project description:The human double-homeodomain retrogene DUX4 is expressed in the testis and epigenetically repressed in somatic tissues. Facioscapulohumeral muscular dystrophy (FSHD) is caused by mutations that decrease the epigenetic repression of DUX4 in somatic tissues and result in mis-expression of this transcription factor in skeletal muscle. DUX4 binds sites in the human genome that contain a double-homeobox sequence motif, including sites in unique regions of the genome as well as many sites in repetitive elements. Using ChIP-seq and RNA-seq on myoblasts transduced with DUX4 we show that DUX4 binds and activates transcription of mammalian apparent LTR-retrotransposons (MaLRs), endogenous retrovirus (ERVL and ERVK) elements, and pericentromeric satellite HSATII sequences. Some DUX4-activated MaLR and ERV elements create novel promoters for genes, long non-coding RNAs, and antisense transcripts. Many of these novel transcripts are expressed in FSHD muscle cells but not control cells, and thus might contribute to FSHD pathology. For example, HEY1, a repressor of myogenesis, is activated by DUX4 through a MaLR promoter. DUX4-bound motifs, including those in repetitive elements, show evolutionary conservation and some repeat-initiated transcripts are expressed in healthy testis, the normal expression site of DUX4, but more rarely in other somatic tissues. Testis expression patterns are known to have evolved rapidly in mammals, but the mechanisms behind this rapid change have not yet been identified: our results suggest that mobilization of MaLR and ERV elements during mammalian evolution altered germline gene expression patterns through transcriptional activation by DUX4. Our findings demonstrate a role for DUX4 and repetitive elements in mammalian germline evolution and in FSHD muscular dystrophy. RNA-seq of differentiated human primary myotube cell lines for FSHD patients and control samples Raw data not provided due to patient privacy concerns.
2014-03-19 | E-GEOD-51041 | biostudies-arrayexpress
Project description:Facioscapulohumeral dystrophy (FSHD) is caused by decreased epigenetic repression of the D4Z4 macrosatellite array and recent studies have shown that this results in the expression of low levels of the DUX4 mRNA in skeletal muscle. Several other mechanisms have been suggested for FSHD pathophysiology and it remains unknown whether DUX4 expression can account for most of the molecular changes seen in FSHD. Since DUX4 is a transcription factor, we used RNA-seq to measure gene expression in muscle cells transduced with DUX4, and in muscle cells and biopsies from control and FSHD individuals. We show that DUX4 target gene expression is the major molecular signature in FSHD muscle together with a gene expression signature consistent with an immune cell infiltration. In addition, one unaffected individual without a known FSHD-causing mutation showed expression of DUX4 target genes. This individual has a sibling with FSHD and also without a known FSHD-causing mutation, suggesting the presence of yet unidentified modifier locus for DUX4 expression and FSHD. These findings demonstrate that expression of DUX4 accounts for the majority of the gene expression changes in FSHD skeletal muscle together with an immune cell infiltration. RNA-seq for muscle cells and biopsies from control and FSHD individuals.
2014-07-03 | E-GEOD-56787 | biostudies-arrayexpress
Project description:The human double-homeodomain retrogene DUX4 is normally expressed at high levels in germ cells of the testis. When aberrantly expressed in muscle its protein product causes facioscapulohumeral muscular dystrophy (FSHD), perhaps partly by inducing inappropriate expression of germline genes. DUX4 can bind >60,000 locations in the human genome that contain a strongly enriched sequence motif. Numerous long terminal repeat (LTR) class repetitive elements are enriched among DUX4 binding sites, including many from the mammalian apparent LTR-retrotransposon (MaLR) family as well as some ERVL and ERVK types, with MaLRs comprising ~1/3 of DUX4’s binding sites. We performed RNA-seq on myoblasts over-expressing DUX4 and find that DUX4 binding activates transcription of some but not all bound repeat types. Some of these activated repetitive elements comprise novel promoters for genes, long non-coding RNAs and antisense transcripts. We show that some of these chimeric repeat-initiated transcripts are expressed in testis and FSHD patient myotubes. The acquisition of MaLR-LTR elements during mammalian evolution may therefore have allowed rewiring of the transcriptional network. We also find that the pericentromeric satellite HSATII can be bound by DUX4 and that its transcription is massively induced by DUX4 over-expression. Our findings suggest a role for repetitive element transcripts in muscle disease and in the biology of normal testis. RNA-seq of two myoblast cell lines transduced with lentivirus carrying DUX4, and two control myoblast lines
2013-10-01 | E-GEOD-45883 | biostudies-arrayexpress