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Molecular and Cellular Biology, October 2000, p. 7388-7400, Vol. 20, No. 19
0270-7306/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
An Intronic Splicing Silencer Causes Skipping of the IIIb Exon
of Fibroblast Growth Factor Receptor 2 through Involvement of
Polypyrimidine Tract Binding Protein
Russ P.
Carstens,1,2,3,
Eric
J.
Wagner,4 and
Mariano A.
Garcia-Blanco1,3,5,*
Department of
Genetics,1 Division of
Nephrology,2 Department of
Medicine,3 Department of
Microbiology,5 and Program in Molecular
Cancer Biology,4 Duke University Medical Center,
Durham, North Carolina 27710
Received 14 March 2000/Returned for modification 17 April
2000/Accepted 29 June 2000
Alternative splicing of fibroblast growth factor receptor 2 (FGF-R2) transcripts involves the mutually exclusive usage of exons
IIIb and IIIc to produce two different receptor isoforms. Appropriate
splicing of exon IIIb in rat prostate cancer DT3 cells requires a
previously described cis element (ISAR, for "intronic splicing activator and repressor") which represses the splicing of
exon IIIc and activates the splicing of exon IIIb. This element is
nonfunctional in rat prostate AT3 cells, which repress exon IIIb
inclusion and splice to exon IIIc. We have now identified an intronic
element upstream of exon IIIb that causes repression of exon IIIb
splicing. Deletion of this element abrogates the requirement for ISAR
in order for exon IIIb to be spliced in DT3 cells and causes
inappropriate inclusion of exon IIIb in AT3 cells. This element
consists of two intronic splicing silencer (ISS) sequences, ISS1 and
ISS2. The ISS1 sequence is pyrimidine rich, and in vitro cross-linking
studies demonstrate binding of polypyrimidine tract binding protein
(PTB) to this element. Competition studies demonstrate that mutations
within ISS1 that abolish PTB binding in vitro alleviate splicing
repression in vivo. Cotransfection of a PTB-1 expression vector with a
minigene containing exon IIIb and the intronic splicing silencer
element demonstrate PTB-mediated repression of exon IIIb splicing.
Furthermore, all described PTB isoforms were equally capable of
mediating this effect. Our results support a model of splicing
regulation in which exon IIIc splicing does not represent a default
splicing pathway but rather one in which active repression of exon IIIb
splicing occurs in both cells and in which DT3 cells are able to
overcome this repression in order to splice exon IIIb.
*
Corresponding author. Mailing address: Department of
Genetics, Box 3053, Duke University Medical Center, Durham, NC 27710. Phone: (919) 613-8632. Fax: (919) 613-8646. E-mail:
garci001{at}mc.duke.edu.

Present address: University of Pennsylvania, Philadelphia, PA
19104.
Molecular and Cellular Biology, October 2000, p. 7388-7400, Vol. 20, No. 19
0270-7306/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
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