TY - JOUR
T1 - HnRNP L and hnRNP LL antagonistically modulate PTB-mediated splicing suppression of CHRNA1 pre-mRNA
AU - Rahman, Mohammad Alinoor
AU - Masuda, Akio
AU - Ohe, Kenji
AU - Ito, Mikako
AU - Hutchinson, David O.
AU - Mayeda, Akila
AU - Engel, Andrew G.
AU - Ohno, Kinji
N1 - Funding Information:
We are grateful to Robin Reed (Harvard Medical School, Boston, MA) for kindly providing MS2-MBP fusion protein and to Kentaro Taki (Nagoya University) for his technical assistance on the mass spectrometry analysis. This work was supported by Grants-in-Aid from the MEXT and MHLW of Japan to AM1, KeO, MI, AM4, and KiO; and by NIH Research Grant NS6277 from the NINDS and by Research Grant from the MDA to AGE.
PY - 2013
Y1 - 2013
N2 - CHRNA1 gene, encoding the muscle nicotinic acetylcholine receptor alpha subunit, harbors an inframe exon P3A. Inclusion of exon P3A disables assembly of the acetylcholine receptor subunits. A single nucleotide mutation in exon P3A identified in congenital myasthenic syndrome causes exclusive inclusion of exon P3A. The mutation gains a de novo binding affinity for a splicing enhancing RNA-binding protein, hnRNP LL, and displaces binding of a splicing suppressing RNA-binding protein, hnRNP L. The hnRNP L binds to another splicing repressor PTB through the proline-rich region and promotes PTB binding to the polypyrimidine tract upstream of exon P3A, whereas hnRNP LL lacking the proline-rich region cannot bind to PTB. Interaction of hnRNP L with PTB inhibits association of U2AF 65 and U1 snRNP with the upstream and downstream of P3A, respectively, which causes a defect in exon P3A definition. HnRNP L and hnRNP LL thus antagonistically modulate PTB-mediated splicing suppression of exon P3A.
AB - CHRNA1 gene, encoding the muscle nicotinic acetylcholine receptor alpha subunit, harbors an inframe exon P3A. Inclusion of exon P3A disables assembly of the acetylcholine receptor subunits. A single nucleotide mutation in exon P3A identified in congenital myasthenic syndrome causes exclusive inclusion of exon P3A. The mutation gains a de novo binding affinity for a splicing enhancing RNA-binding protein, hnRNP LL, and displaces binding of a splicing suppressing RNA-binding protein, hnRNP L. The hnRNP L binds to another splicing repressor PTB through the proline-rich region and promotes PTB binding to the polypyrimidine tract upstream of exon P3A, whereas hnRNP LL lacking the proline-rich region cannot bind to PTB. Interaction of hnRNP L with PTB inhibits association of U2AF 65 and U1 snRNP with the upstream and downstream of P3A, respectively, which causes a defect in exon P3A definition. HnRNP L and hnRNP LL thus antagonistically modulate PTB-mediated splicing suppression of exon P3A.
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U2 - 10.1038/srep02931
DO - 10.1038/srep02931
M3 - Article
C2 - 24121633
AN - SCOPUS:84886871632
VL - 3
JO - Scientific Reports
JF - Scientific Reports
SN - 2045-2322
M1 - 2931
ER -