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J. Biol. Chem., Vol. 275, Issue 45, 35353-35360, November 10, 2000

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Heterogeneous Ribonucleoprotein A1 Is Part of an Exon-specific Splice-silencing Complex Controlled by Oncogenic Signaling Pathways^*

Nathalie Matter^§, Manuela Marx^§, Susanne Weg-Remers^¶, Helmut Ponta, Peter Herrlich, and Harald König^**

From the  Forschungszentrum Karlsruhe, Institut für Toxikologie und Genetik, and  Universität Karlsruhe, Institut für Genetik, Postfach 3640, 76021 Karlsruhe, Germany

Regulation of alternative pre-mRNA splicing, recognized as increasingly important in causing human disease, was studied using the CD44 gene, whose splice variants have been implicated in tumor progression. We identified heterogeneous ribonucleoprotein (hnRNP) A1 as a protein interacting in vitro and in vivo with regulatory splice elements in CD44 variant exon v5. Transient overexpression of hnRNP A1 prevented v5 exon inclusion, dependent on the exonic elements. HnRNP A1-dependent repression was exon-specific and could be relieved by coexpression of oncogenic forms of Ras and Cdc42. The results define hnRNP A1 as a decisive part of an oncogene-regulated splice-silencing complex, which can select between multiple alternatively spliced exons.

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