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Helmbrecht, M.S. ; Soellner, H. ; Truckenbrodt, A.M. ; Sundermeier, J. ; Cohrs, C.M. ; Hans, W. ; Hrabě de Angelis, M. ; Feuchtinger, A. ; Aichler, M. ; Fouad, K.* ; Huber, A.B.

Loss of Npn1 from motor neurons causes postnatal deficits independent from Sema3A signaling.

Dev. Biol. 399, 2-14 (2015)
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The correct wiring of neuronal circuits is of crucial importance for the function of the vertebrate nervous system. Guidance cues like the neuropilin receptors (Npn) and their ligands, the semaphorins (Sema) provide a tight spatiotemporal control of sensory and motor axon growth and guidance. Among this family of guidance partners the Sema3A-Npn1 interaction has been shown to be of great importance, since defective signaling leads to wiring deficits and defasciculation. For the embryonic stage these defects have been well described, however, also after birth the organism can adapt to new challenges by compensational mechanisms. Therefore, we used the mouse lines Olig2-Cre;Npn1(cond) and Npn1(Sema-) to investigate how postnatal organisms cope with the loss of Npn1 selectively from motor neurons or a systemic dysfunctional Sema3A-Npn1 signaling in the entire organism, respectively. While in Olig2-Cre(+);Npn1(cond-/-) mice clear anatomical deficits in paw posturing, bone structure, as well as muscle and nerve composition became evident, Npn1(Sema-) mutants appeared anatomically normal. Furthermore, Olig2-Cre(+);Npn1(cond) mutants revealed a dysfunctional extensor muscle innervation after single-train stimulation of the N.radial. Interestingly, these mice did not show obvious deficits in voluntary locomotion, however, skilled motor function was affected. In contrast, Npn1(Sema-) mutants were less affected in all behavioral tests and able to improve their performance over time. Our data suggest that loss of Sema3A-Npn1 signaling is not the only cause for the observed deficits in Olig2-Cre(+);Npn1(cond-/-) mice and that additional, yet unknown binding partners for Npn1 may be involved that allow Npn1(Sema-) mutants to compensate for their developmental deficits.
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Publication type Article: Journal article
Document type Scientific Article
Keywords Motor Neuron ; Npn1 ; Postnatal Development ; Sema3a; Peripheral Nervous-system; Claw-paw Mutation; Axon Guidance; Detailed Quantification; Skeletal-muscle; Sciatic-nerve; Cells; Semaphorin; Neuropilin-1; Innervation
Language english
Publication Year 2015
HGF-reported in Year 2015
ISSN (print) / ISBN 0012-1606
e-ISSN 0012-1606
Journal Developmental Biology
Quellenangaben Volume: 399, Issue: 1, Pages: 2-14 Article Number: , Supplement: ,
Publisher Elsevier
Publishing Place San Diego
Reviewing status Peer reviewed
Institute(s) Institute of Developmental Genetics (IDG)
Institute of Experimental Genetics (IEG)
Institute of Pathology (PATH)
Research Unit Analytical Pathology (AAP)
German Center for Diabetes Reseach (DZD)
POF-Topic(s) 30204 - Cell Programming and Repair
30504 - Mechanisms of Genetic and Environmental Influences on Health and Disease
30201 - Metabolic Health
30205 - Bioengineering and Digital Health
Research field(s) Genetics and Epidemiology
Enabling and Novel Technologies
PSP Element(s) G-500500-001
G-500592-001
G-500500-005
G-500600-001
G-500300-001
G-500390-001
G-500600-003
PubMed ID 25512301
DOI 10.1016/j.ydbio.2014.11.024
WOS ID WOS:000350709300002
Scopus ID 84923967833
Scopus ID 84921485156
Erfassungsdatum 2015-01-01
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