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2014 ; 56
(2
): 311-322
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Loss of MBNL leads to disruption of developmentally regulated alternative
polyadenylation in RNA-mediated disease
#MMPMID25263597
Batra R
; Charizanis K
; Manchanda M
; Mohan A
; Li M
; Finn DJ
; Goodwin M
; Zhang C
; Sobczak K
; Thornton CA
; Swanson MS
Mol Cell
2014[Oct]; 56
(2
): 311-322
PMID25263597
show ga
Inhibition of muscleblind-like (MBNL) activity due to sequestration by
microsatellite expansion RNAs is a major pathogenic event in the RNA-mediated
disease myotonic dystrophy (DM). Although MBNL1 and MBNL2 bind to nascent
transcripts to regulate alternative splicing during muscle and brain development,
another major binding site for the MBNL protein family is the 3' untranslated
region of target RNAs. Here, we report that depletion of Mbnl proteins in mouse
embryo fibroblasts leads to misregulation of thousands of alternative
polyadenylation events. HITS-CLIP and minigene reporter analyses indicate that
these polyadenylation switches are a direct consequence of MBNL binding to target
RNAs. Misregulated alternative polyadenylation also occurs in skeletal muscle in
a mouse polyCUG model and human DM, resulting in the persistence of neonatal
polyadenylation patterns. These findings reveal an additional developmental
function for MBNL proteins and demonstrate that DM is characterized by
misregulation of pre-mRNA processing at multiple levels.