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Myotonic dystrophy: the role of the CUG triplet repeats in splicing of a novel DMPK exon and altered cytoplasmic DMPK mRNA isoform ratios.

Abstract：

:The mechanism by which (CTG)n expansion in the 3' UTR of the DMPK gene causes myotonic dystrophy (DM) is unknown. We identified four RNA splicing factors--hnRNP C, U2AF (U2 auxiliary factor), PTB (polypyrimidine tract binding protein), and PSF (PTB associated splicing factor)--that bind to two short regions 3' of the (CUG)n, and found a novel 3' DMPK exon resulting in an mRNA lacking the repeats. We propose that the (CUG)n is an essential cis acting element for this splicing event. In contrast to (CUG)n containing mRNAs, the novel isoform is not retained in the nucleus in DM cells, resulting in imbalances in relative levels of cytoplasmic DMPK mRNA isoforms and a new dominant effect of the mutation on DMPK.

journal_name

Mol Cell

journal_title

Molecular cell

authors

Tiscornia G,Mahadevan MS

doi

10.1016/s1097-2765(00)80261-0

subject

Has Abstract

pub_date

2000-06-01 00:00:00

pages

959-67

issue

6

eissn

1097-2765

issn

1097-4164

pii

S1097-2765(00)80261-0

journal_volume

5

pub_type

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