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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Isoforms of the avian TrkC receptor: a novel kinase insertion dissociates transformation and process outgrowth from survival.

TrkC receptor isoforms have been identified by cDNA cloning and RT-PCR analysis of embryonic chick brain RNA. An N-terminal truncation motif is missing from the signal sequence and first cysteine cluster of the extracellular domain. Within the cytoplasmic dimain, a kinase truncation motif retains part of the kinase domain, but appeared to lack activity. Finally, a kinase insert (KI) motif introduces a 25 amino acid sequence distinct from the known mammalian inserts. KI receptors, like full-length receptors, were tyrosine phosphorylated in response to NT-3 and mediated the transformation of chick embryo fibroblasts and process outgrowth from rat PC12 cells. However, KI receptors supported little, if any, survival of serum-deprived PC12 cells. These results indicate that alternative splicing of trkC transcripts is an important mechanism for regulating cellular responses to NT-3.[1]


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