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J. Biol. Chem., Vol. 275, Issue 38, 29562-29569, September 22, 2000
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From the H19 RNA is a major oncofetal 2.5-kilobase
untranslated RNA of unknown function. The maternally expressed
H19 gene is located 90 kilobase pairs downstream from the
paternally expressed insulin-like growth factor II
(IGF-II) gene on human chromosome 11 and mouse chromosome
7; and due to their reciprocal imprinting and identical spatiotemporal
expression, it is assumed that the two genes are functionally coupled.
Here we show that human H19 RNA contains four attachment sites for the
oncofetal IGF-II mRNA-binding protein (IMP) with apparent
Kd values in the 0.4-1.3 nM range. The
multiple attachment sites are clustered within a 700-nucleotide segment
encoded by exons 4 and 5. This 3'-terminal segment targets H19 RNA to
lamellipodia and perinuclear regions in dispersed fibroblasts where IMP
is also localized. The results suggest that IMP participates in H19 RNA
localization and provides a link between the IGF-II and H19
genes at post-transcriptional events during mammalian development.
H19 RNA Binds Four Molecules of Insulin-like Growth Factor II
mRNA-binding Protein*
,
,
¶,
, and
**
RNA Regulation Centre, Institute of
Molecular Biology, and the
Institute of Molecular Pathology,
University of Copenhagen, DK-1307 Copenhagen, the
§ Department of Clinical Biochemistry, Rigshospitalet,
DK-2100 Copenhagen Ø, Denmark
*
The work was supported by the Danish Cancer Society, the
Novo Nordisk Foundation, and the Danish Natural Science and Medical Research Councils and their Biotek II Program.The costs of publication of this
article were defrayed in part by the
payment of page charges. The article
must therefore be hereby marked
"advertisement" in accordance with 18 U.S.C. Section
1734 solely to indicate this fact.
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