» Articles » PMID: 21685920

Misregulation of MiR-1 Processing is Associated with Heart Defects in Myotonic Dystrophy

Abstract

Myotonic dystrophy is an RNA gain-of-function disease caused by expanded CUG or CCUG repeats, which sequester the RNA binding protein MBNL1. Here we describe a newly discovered function for MBNL1 as a regulator of pre-miR-1 biogenesis and find that miR-1 processing is altered in heart samples from people with myotonic dystrophy. MBNL1 binds to a UGC motif located within the loop of pre-miR-1 and competes for the binding of LIN28, which promotes pre-miR-1 uridylation by ZCCHC11 (TUT4) and blocks Dicer processing. As a consequence of miR-1 loss, expression of GJA1 (connexin 43) and CACNA1C (Cav1.2), which are targets of miR-1, is increased in both DM1- and DM2-affected hearts. CACNA1C and GJA1 encode the main calcium- and gap-junction channels in heart, respectively, and we propose that their misregulation may contribute to the cardiac dysfunctions observed in affected persons.

Citing Articles

Functions of the Muscleblind-like protein family and their role in disease.

Zhou H, Xu J, Pan L Cell Commun Signal. 2025; 23(1):97.

PMID: 39966885 PMC: 11837677. DOI: 10.1186/s12964-025-02102-5.


MBNL splicing factors regulate the microtranscriptome of skeletal muscles.

Piasecka A, Szczesniak M, Sekrecki M, Kajdasz A, Sznajder L, Baud A Nucleic Acids Res. 2024; 52(19):12055-12073.

PMID: 39258536 PMC: 11514471. DOI: 10.1093/nar/gkae774.


The Muscleblind-like protein MBL-1 regulates microRNA expression in Caenorhabditis elegans through an evolutionarily conserved autoregulatory mechanism.

Verbeeren J, Teixeira J, Garcia S PLoS Genet. 2023; 19(12):e1011109.

PMID: 38134228 PMC: 10773944. DOI: 10.1371/journal.pgen.1011109.


RNA modification in cardiovascular disease: implications for therapeutic interventions.

Wang C, Hou X, Guan Q, Zhou H, Zhou L, Liu L Signal Transduct Target Ther. 2023; 8(1):412.

PMID: 37884527 PMC: 10603151. DOI: 10.1038/s41392-023-01638-7.


Cardiac involvement in patient-specific induced pluripotent stem cells of myotonic dystrophy type 1: unveiling the impact of voltage-gated sodium channels.

Pierre M, Djemai M, Chapotte-Baldacci C, Pouliot V, Puymirat J, Boutjdir M Front Physiol. 2023; 14:1258318.

PMID: 37791351 PMC: 10544896. DOI: 10.3389/fphys.2023.1258318.


References
1.
Terentyev D, Belevych A, Terentyeva R, Martin M, Malana G, Kuhn D . miR-1 overexpression enhances Ca(2+) release and promotes cardiac arrhythmogenesis by targeting PP2A regulatory subunit B56alpha and causing CaMKII-dependent hyperphosphorylation of RyR2. Circ Res. 2009; 104(4):514-21. PMC: 4394868. DOI: 10.1161/CIRCRESAHA.108.181651. View

2.
Wang G, Kearney D, De Biasi M, Taffet G, Cooper T . Elevation of RNA-binding protein CUGBP1 is an early event in an inducible heart-specific mouse model of myotonic dystrophy. J Clin Invest. 2007; 117(10):2802-11. PMC: 1964514. DOI: 10.1172/JCI32308. View

3.
Trabucchi M, Briata P, Garcia-Mayoral M, Haase A, Filipowicz W, Ramos A . The RNA-binding protein KSRP promotes the biogenesis of a subset of microRNAs. Nature. 2009; 459(7249):1010-4. PMC: 2768332. DOI: 10.1038/nature08025. View

4.
Heo I, Joo C, Cho J, Ha M, Han J, Kim V . Lin28 mediates the terminal uridylation of let-7 precursor MicroRNA. Mol Cell. 2008; 32(2):276-84. DOI: 10.1016/j.molcel.2008.09.014. View

5.
Yi R, Qin Y, Macara I, Cullen B . Exportin-5 mediates the nuclear export of pre-microRNAs and short hairpin RNAs. Genes Dev. 2003; 17(24):3011-6. PMC: 305252. DOI: 10.1101/gad.1158803. View