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Molecular and Cellular Biology, March 1999, p. 1640-1650, Vol. 19, No. 3
0270-7306/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
A Premature Termination Codon Interferes with the
Nuclear Function of an Exon Splicing Enhancer in an Open Reading
Frame-Dependent Manner
Anand
Gersappe and
David J.
Pintel*
Department of Molecular Microbiology and
Immunology, School of Medicine, University of Missouri
Columbia,
Columbia, Missouri 65212
Received 28 September 1998/Returned for modification 29 October
1998/Accepted 29 November 1998
Premature translation termination codon (PTC)-mediated effects on
nuclear RNA processing have been shown to be associated with a number
of human genetic diseases; however, how these PTCs mediate such effects
in the nucleus is unclear. A PTC at nucleotide (nt) 2018 that lies
adjacent to the 5' element of a bipartite exon splicing enhancer within
the NS2-specific exon of minute virus of mice P4 promoter-generated
pre-mRNA caused a decrease in the accumulated levels of P4-generated R2
mRNA relative to P4-generated R1 mRNA, although the total accumulated
levels of P4 product remained the same. This effect was seen in nuclear RNA and was independent of RNA stability. The 5' and 3' elements of the
bipartite NS2-specific exon enhancer are redundant in function, and
when the 2018 PTC was combined with a deletion of the 3' enhancer element, the exon was skipped in the majority of the viral P4-generated product. Such exon skipping in response to a PTC, but not a missense mutation at nt 2018, could be suppressed by frame shift mutations in
either exon of NS2 which reopened the NS2 open reading frame, as well
as by improvement of the upstream intron 3' splice site. These results
suggest that a PTC can interfere with the function of an exon splicing
enhancer in an open reading frame-dependent manner and that the PTC is
recognized in the nucleus.
*
Corresponding author. Mailing address: Department of
Molecular Microbiology and Immunology, School of Medicine, University of Missouri
Columbia, Columbia, MO 65212. Phone: (573) 882-3920. Fax:
(573) 882-4287. E-mail: pinteld{at}missouri.edu.
Molecular and Cellular Biology, March 1999, p. 1640-1650, Vol. 19, No. 3
0270-7306/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
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