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Development, Vol 121, Issue 12 4067-4075, Copyright © 1995 by Company of Biologists
JOURNAL ARTICLES |
L Minichiello, F Piehl, E Vazquez, T Schimmang, T Hokfelt, J Represa and R Klein
Differentiation Programme, European Molecular Biology Laboratory, Heidelberg, Germany.
We have generated double mutant mice deficient in pairs of two different Trk receptors and have analysed the effects on survival and differentiation of dorsal root ganglion (DRG), inner ear cochlear and vestibular sensory neurons. In most combinations of mutant trk alleles, the defects observed in double compared to single mutant mice were additive. However, double homozygous trkA-/-;trkB-/- DRG and trkB-/-;trkC-/- vestibular neurons showed the same degree of survival as single trkA-/- and trkB-/- mice, respectively, suggesting that those neurons required both Trk signaling pathways for survival. In situ hybridisation analysis of DRG neurons of double mutant mice revealed differential expression of excitatory neuropeptides. Whereas calcitonin-gene-related peptide expression correlated with the trkA phenotype, substance P expression was detected in all combinations of double mutant mice. In the inner ear, TrkB- and TrkC-dependent neurons were shown to at least partially depend on each other for survival, most likely indirectly due to abnormal development of their common targets. This effect was not observed in DRGs, where neurons depending on different Trk receptors generally innervate different targets.
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