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J Cell Biol. 2018 Nov 7. pii: jcb.201804106. doi: 10.1083/jcb.201804106. [Epub ahead of print]

HGF-induced migration depends on the PI(3,4,5)P3-binding microexon-spliced variant of the Arf6 exchange factor cytohesin-1.

Author information

1
Rosalind and Morris Goodman Cancer Research Centre, McGill University, Montreal, Quebec, Canada.
2
Department of Biochemistry, McGill University, Montreal, Quebec, Canada.
3
Rosalind and Morris Goodman Cancer Research Centre, McGill University, Montreal, Quebec, Canada morag.park@mcgill.ca.
4
Department of Medicine, McGill University, Montreal, Quebec, Canada.
5
Department of Oncology, McGill University, Montreal, Quebec, Canada.

Abstract

Differential inclusion or skipping of microexons is an increasingly recognized class of alternative splicing events. However, the functional significance of microexons and their contribution to signaling diversity is poorly understood. The Met receptor tyrosine kinase (RTK) modulates invasive growth and migration in development and cancer. Here, we show that microexon switching in the Arf6 guanine nucleotide exchange factor cytohesin-1 controls Met-dependent cell migration. Cytohesin-1 isoforms, differing by the inclusion of an evolutionarily conserved three-nucleotide microexon in the pleckstrin homology domain, display differential affinity for PI(4,5)P2 (triglycine) and PI(3,4,5)P3 (diglycine). We show that selective phosphoinositide recognition by cytohesin-1 isoforms promotes distinct subcellular localizations, whereby the triglycine isoform localizes to the plasma membrane and the diglycine to the leading edge. These data highlight microexon skipping as a mechanism to spatially restrict signaling and provide a mechanistic link between RTK-initiated phosphoinositide microdomains and Arf6 during signal transduction and cancer cell migration.

PMID:
30404949
DOI:
10.1083/jcb.201804106

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