Targeted Deletion of All Isoforms of the TrkC Gene Suggests the Use of Alternate Receptors by Its Ligand Neurotrophin-3 in Neuronal Development and Implicates TrkC in Normal Cardiogenesis

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 1998 Feb 7

PMID 9405689

Citations 69

Authors

L Tessarollo

P Tsoulfas

M J Donovan

M E Palko

B L Hempstead

L F Parada

Affiliations

Soon will be listed here.

Abstract

We have generated null mutant mice that lack expression of all isoforms encoded by the trkC locus. These mice display a behavioral phenotype characterized by a loss of proprioceptive neurons. Neuronal counts of sensory ganglia in the trkC mutant mice reveal less severe losses than those in NT-3 null mutant mice, strongly suggesting that NT-3, in vivo, may signal through receptors other than trkC. Mice lacking either NT-3 or all trkC receptor isoforms die in the early postnatal period. Histological examination of trkC-deficient mice reveals severe cardiac defects such as atrial and ventricular septal defects, and valvular defects including pulmonic stenosis. Formation of these structures during development is dependent on cardiac neural crest function. The similarities in cardiac defects observed in the trkC and NT-3 null mutant mice indicate that the trkC receptor mediates most NT-3 effects on the cardiac neural crest.

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