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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Cell+Biol
2015 ; 208
(7
): 1003-18
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L1CAM/Neuroglian controls the axon-axon interactions establishing layered and
lobular mushroom body architecture
#MMPMID25825519
Siegenthaler D
; Enneking EM
; Moreno E
; Pielage J
J Cell Biol
2015[Mar]; 208
(7
): 1003-18
PMID25825519
show ga
The establishment of neuronal circuits depends on the guidance of axons both
along and in between axonal populations of different identity; however, the
molecular principles controlling axon-axon interactions in vivo remain largely
elusive. We demonstrate that the Drosophila melanogaster L1CAM homologue
Neuroglian mediates adhesion between functionally distinct mushroom body axon
populations to enforce and control appropriate projections into distinct axonal
layers and lobes essential for olfactory learning and memory. We addressed the
regulatory mechanisms controlling homophilic Neuroglian-mediated cell adhesion by
analyzing targeted mutations of extra- and intracellular Neuroglian domains in
combination with cell type-specific rescue assays in vivo. We demonstrate
independent and cooperative domain requirements: intercalating growth depends on
homophilic adhesion mediated by extracellular Ig domains. For functional cluster
formation, intracellular Ankyrin2 association is sufficient on one side of the
trans-axonal complex whereas Moesin association is likely required simultaneously
in both interacting axonal populations. Together, our results provide novel
mechanistic insights into cell adhesion molecule-mediated axon-axon interactions
that enable precise assembly of complex neuronal circuits.