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Ares Swanson MBNL mutant study

ABSTRACT: MBNL1 is a known splicing factor and is related to Myotonic Dystrophy (DM). This study examines the tissue specific splicing patterns of MBNL1 using a mutant and wild type mouse across three tissues (heart,brain,quadricep) related publications: Aberrant alternative splicing and extracellular matrix gene expression in mouse models of myotonic dystrophy. Du H, etal Nat Struct Mol Biol. 2010 Feb;17(2):187-93. and Hum Mol Genet. 2006 Jul 1;15(13):2087-97. Failure of MBNL1-dependent post-natal splicing transitions in myotonic dystrophy. Lin X, Miller JW, Mankodi A, Kanadia RN, Yuan Y, Moxley RT, Swanson MS, Thornton CA. We examined quadricep,heart and brain of a mouse MBNL1 mutant to test whether MBNL mutants creates a tissue specific splicing defect. These samples were compared to the tissues of a wild type mouse.

ORGANISM(S): Mus musculus

SUBMITTER: Manny Ares

PROVIDER: E-GEOD-28640 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Alternative splicing and gene expression in a mouse model of myotonic dystrophy

Project description:Distinct RNA-mediated impacts on alternative splicing and extracellular matrix gene expression in a mouse model of myotonic dystrophy. Myotonic dystrophy (DM1) is associated with expression of expanded CTG DNA repeats as RNA (CUGexp RNA). To test whether CUGexp RNA creates a global splicing defect, we compared skeletal muscle of two mouse DM1 models, one expressing a CTGexp transgene, and another homozygous for a defective Mbnl1 gene. Strong correlation in splicing changes for ~100 new Mbnl1-regulated exons indicates loss of Mbnl1 explains >80% of the splicing pathology due to CUGexp RNA. In contrast, only about half of mRNA level changes can be attributed to loss of Mbnl1, indicating CUGexp RNA has Mbnl1-independent effects, particularly on mRNAs for extracellular matrix (ECM) proteins. We propose that CUGexp RNA causes two separate effects: loss of Mbnl1 function, disrupting splicing, and loss of another function that disrupts ECM mRNA regulation, possibly mediated by MBNL2. These findings reveal unanticipated similarities between DM1 and other muscular dystrophies. MBNL1 knockout and HSALR mice on FVB background. To test whether CUGexp RNA creates a global splicing defect, we compared skeletal muscle of two mouse DM1 models, one expressing a CTGexp transgene, and another homozygous for a defective Mbnl1 gene. These samples were compared to the skeletal muscle of a wildtype mouse.

2010-01-23 | E-GEOD-17986 | biostudies-arrayexpress

Ares Swanson MBNL mutant study

Project description:MBNL1 is a known splicing factor and is related to Myotonic Dystrophy (DM). This study examines the tissue specific splicing patterns of MBNL1 using a mutant and wild type mouse across three tissues (heart,brain,quadricep) related publications: Aberrant alternative splicing and extracellular matrix gene expression in mouse models of myotonic dystrophy. Du H, etal Nat Struct Mol Biol. 2010 Feb;17(2):187-93. and Muscleblind-like 1 knockout mice reveal novel splicing defects in the myotonic dystrophy brain. Suenaga K, Lee KY, Nakamori M, Tatsumi Y, Takahashi MP, Fujimura H, Jinnai K, Yoshikawa H, Du H, Ares M Jr, Swanson MS, Kimura T. PLoS One. 2012;7(3):e33218. Epub 2012 Mar 13. PMID: 22427994 and Hum Mol Genet. 2006 Jul 1;15(13):2087-97. Failure of MBNL1-dependent post-natal splicing transitions in myotonic dystrophy. Lin X, Miller JW, Mankodi A, Kanadia RN, Yuan Y, Moxley RT, Swanson MS, Thornton CA.

2012-07-31 | GSE28640 | GEO

Alternative splicing and gene expression in a mouse model of myotonic dystrophy

2010-01-24 | GSE17986 | GEO

Exon array analysis in the mouse myoblast cell line, C2C12 cells treated with control-, Cugbp1- or Mbnl1-siRNA

Project description:CUGBP1 and MBNL1 are developmentally regulated RNA-binding proteins that are causally associated with myotonic dystrophy type 1. Using HITS-CLIP anlysis, we found CUGBP1 and MBNL1 preferentially bind to alternatively spliced introns and exons, as well as to the 3' UTRs. To analyze more directly the role of CUGBP1/MBNL1 binding in alternative splicing, we performed exon array analysis in C2C12 cells using expression arrays. We analyzed total RNA of C2C12 cells treated with control-, Cugbp1- or Mbnl1-siRNA. RNA was harvested 48 hrs after transfection.

2012-01-03 | E-GEOD-29990 | biostudies-arrayexpress

mRNA decay analysis in the mouse myoblast cell line, C2C12 cells treated with conrtol-, Cugbp1- or Mbnl1-siRNA

Project description:CUGBP1 and MBNL1 are developmentally regulated RNA-binding proteins that are causally associated with myotonic dystrophy type 1. Using HITS-CLIP anlysis, we found CUGBP1 and MBNL1 preferentially bind to alternatively spliced introns and exons, as well as to the 3' UTRs. To analyze more directly the role of CUGBP1/MBNL1 binding to the 3’ UTR, we performed global analysis of mRNA stability in C2C12 cells using expression arrays, and found that CUGBP1 and MBNL1 regulate decay of endogenous mRNAs. We analyzed total RNA of C2C12 cells treated with control-, Cugbp1- or Mbnl1-siRNA. We analyzed 3 time points after addition of actionmycin D (0, 2.5, 5 hours).

2012-01-03 | E-GEOD-27583 | biostudies-arrayexpress

Exon array analysis in the mouse myoblast cell line, C2C12 cells treated with control-, Cugbp1- or Mbnl1-siRNA

2012-01-03 | GSE29990 | GEO

RNA CLIP-seq for Cugbp1, Mbnl1 and Ptbp1 in mouse C2C12 myoblasts

Project description:CUG-binding protein 1 (CUGBP1) and muscleblind-like 1 (MBNL1) are developmentally regulated RNA-binding proteins that are causally associated with myotonic dystrophy type 1. We extensively determined RNA-binding sites of CUGBP1 and MBNL1 to investigate their roles in RNA processing. We also analyzed polypyrimidine tract-binding protein (PTB) as a control. CUGBP1 and MBNL1 preferentially bind to alternatively spliced introns and exons, respectively, and regulate alternative splicing events. Moreover, CUGBP1 and MBNL1 are preferentially bound to the 3' untranslated regions (UTRs), in particular of genes for RNA-binding proteins, and facilitate decay of the bound mRNAs. In addition, CUGBP1 and MBNL1 mutually destabilize mRNA. Precise temporal regulation of CUGBP1 and MBNL1 are likely to be essential for accurate control of destabilization of a broad spectrum of genes as well as of alternative splicing events in cell differentiation and tissue development.

2012-01-04 | E-MTAB-414 | biostudies-arrayexpress

Misregulation of alternative splicing of BIN1 leads to T-tubule alterations and muscle weakness in myotonic dystrophy

Project description:Myotonic dystrophes (DM), the most common adult muscular dystrophy, are the first recognized examples of RNA-mediated diseases in which expression of mutant RNAs containing expanded CUG or CCUG repeats interfere with the splicing of other mRNAs. Using whole-genome microarrays, we found that alternative splicing of the BIN1 mRNA is altered in DM skeletal muscle tissues, resulting in the expression of an inactive form of BIN1 deprived of phosphoinositide-binding and membrane-tubulating activities. BIN1 is involved in tubular invaginations of the plasma membrane and is essential for biogenesis of the muscle T-tubules, which are specialized skeletal muscle membrane structures essential to correct excitation-contraction (E-C) coupling. Mutations in the BIN1 gene cause centronuclear myopathy (CNM) that shares some histopathological features with DM, and both diseases are characterized by muscle weakness. Consistent with a loss-of-function of BIN1, muscle T-tubules were altered in DM patients, and membrane tubulation was restored upon expression of the correct splicing form of BIN1 in DM muscle cells. By deciphering the mechanism of BIN1 splicing mis-regulation we demonstrate that the splicing regulator, MBNL1, which is sequestered by expanded CUG and CCUG in DM, binds the BIN1 pre-mRNA and regulates directly its alternative splicing. Finally, reproducing BIN1 splicing alteration in mice is sufficient to reproduce the DM features of T-tubule alterations and muscle weakness. We propose that alteration of BIN1 alternative splicing regulation leads to muscle weakness, a predominant pathological feature of DM. Exon-Array analysis of control and CDM1 muscle primary cultures 10 days of differentiation

2011-05-26 | E-GEOD-21795 | biostudies-arrayexpress

Comparative analysis of Mbl attenuation and CUG non-coding repeats expression in Drosophila larval muscles

Project description:Myotonic dystrophy type 1 (DM1) is a neuro-muscular disorder caused by CTG triplet expansion in the 3-UTR of the DMPK gene. Mutated transcripts aggregate in muscle nuclei and sequester the MBNL1 splicing factor. To assess the involvement of Mbl sequestration on transcriptpion deregulation in DM1, we performed genome wide analyses of gene expression of DM1 Drosophila model in three different genetic contexts: Mef>mblRNAi, Mef>600CTG, Mef>960CTG vs. Mef>lacZ control line.

2013-04-01 | E-MTAB-1469 | biostudies-arrayexpress

Effect of myotonic dystrophy on pre-mRNA alternative splicing in skeletal muscle

Project description:Misregulated alternative splicing appears to be a major factor in the pathogenesis of myotonic dystrophy. The present study was done to further explore alternative splicing in this condition by doing exon-level analysis of mRNA from skeletal muscle of 8 subjects with type 1 myotonic dystrophy, 7 subjects with type 2 myotonic dystrophy, 8 disease controls (subjects with facioscapulohumeral muscular dystrophy), and 8 healthy controls . The ratios of signals from the various exons of a gene provided an index of altered exon inclusion/exclusion that was independent of the overall expression of that gene. There were numerous transcripts for which there was evidence of abnormal alternative splicing in subjects with myotonic dystrophy. For many of these transcripts, the abnormal splicing was confirmed by an independent RT-PCR approach. 31 subjects, one sample per subject, four groups: healthy subjects (n = 8), facioscapulohumeral dystrophy (n = 8), type 1 myotonic dystrophy (n = 8), type 2 myotonic dystrophy (n = 7)

2013-06-15 | E-GEOD-47968 | biostudies-arrayexpress

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