Journal
EMBO JOURNAL
Volume 20, Issue 19, Pages 5443-5452Publisher
WILEY
DOI: 10.1093/emboj/20.19.5443
Keywords
hnRNP proteins; pre-mRNA splicing; spinal muscular atrophy; survival of motor neurons
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Funding
- NINDS NIH HHS [K08 NS 02199] Funding Source: Medline
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Spinal muscular atrophy (SMA) is a common neurodegenerative disease caused by deletion or loss-of-function mutations of the survival of motor neurons (SMN) protein. SMN is in a complex with several proteins, including Gemin2, Gemin3 and Gemin4, and it plays important roles in small nuclear ribonucleoprotein (snRNP) biogenesis and in pre-mRNA splicing. Here, we characterize three new hnRNP proteins, collectively referred to as hnRNP Qs, which are derived from alternative splicing of a single gene. The hnRNP Q proteins interact with SMN, and the most common SMN mutant found in SMA patients is defective in its interactions with them. We further demonstrate that hnRNP Qs are required for efficient pre-mRNA splicing in vitro. The hnRNP Q proteins may provide a molecular link between the SMN complex and splicing.
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