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September 8, 2011Journal of Biological ChemistryOpen Access

Expanded CUG Repeats Dysregulate RNA Splicing by Altering the Stoichiometry of the Muscleblind 1 Complex

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Key result

Expanded CUG repeats alter MBNL1 complex stoichiometry in DM1 myoblasts, dysregulating RNA splicing.

Population

Normal human myoblasts, myotonic dystrophy I (DM1) myoblasts, and Cos7 cells

Comparison

Expression of expanded CUG repeat RNA and… vs Normal myoblasts or baseline state

Design

Preclinical

Authors

SPSharan PaulUniversity of UtahWDWarunee DansithongUniversity of UtahSJSonali P. JogUniversity of Southern California

Discussion

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Implication

Should not yet inform DM1 management; leaves open MBNL1 stoichiometry as a therapeutic target in models.

Structured PICO

P
Population
Normal human myoblasts, myotonic dystrophy I (DM1) myoblasts, and Cos7 cells
E
Exposure
Expression of expanded CUG repeat RNA and modeling increased levels of hnRNP H, H2, H3, F, and DDX5
C
Comparator
Normal myoblasts or baseline state
O
Outcome
Stoichiometry of MBNL1(CUG) complexes and RNA splicing dysregulationsurrogate

Expanded CUG repeats in myotonic dystrophy type 1 alter the stoichiometry of MBNL1 complexes, leading to the reinforcement and expansion of RNA processing defects.

Cite This Study

Paul et al. (2011) studied Myotonic dystrophy I (DM1). Expanded CUG repeats vs. Normal myoblasts was evaluated on Stoichiometry of MBNL1(CUG) complexes and RNA splicing. Expression of expanded CUG repeats altered the stoichiometry of MBNL1(CUG) complexes in DM1 myoblasts, increasing levels of partner proteins and dysregulating RNA splicing.

synapsesocial.com/papers/6aa7a3eeea76de5c364f28a2https://doi.org/10.1074/jbc.m111.255224
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Also Consider

Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context:

  1. 1Muscleblind protein, MBNL1/EXP, binds specifically to CHHG repeats2004 · 172 citations
  2. 2Myotonic Dystrophy Mutation: an Unstable CTG Repeat in the 3′ Untranslated region of the Gene1992 · 1,675 citations
  3. 3Mechanism of the Internal Ribosome Entry Site-mediated Translation of Serine Hydroxymethyltransferase 12009 · 25 citations
  4. 4An Unstable Triplet Repeat in a Gene Related to Myotonic Muscular Dystrophy1992 · 1,472 citations
  5. 5The DEAD box RNA helicases p68 (Ddx5) and p72 (Ddx17): novel transcriptional co-regulators2008 · 102 citations