Thus in the callosum of knockout mice lacking Ryk receptors guidance errors were attributed to disruption of Wnt5a/Ryk-mediated axon repulsion.
The over-represented canonical pathways associated with both IA and HI genes included IL-4, B cell receptor, axonal guidance, T cell receptor and glucocorticoid receptor signaling (Table 1, Additional file 2: Table S2 1).
The nervous system was not highly affected when considering functional analyses in IPA (Additional Files 3, 4, 5, 10, and 11) or GO (Additional Files 15 and 16); however, several pathways involved in neuronal outgrowth appeared significantly inhibited including Ephrin receptor, axonal guidance, and CDK5 signaling.
Again, Samad et al. also reported a second co-receptor: repulsive guidance molecule, a homologue of DRAGON, seems to be similarly involved in the BMP signaling pathway.
These properties make affibody FAP fusions a potentially versatile tool in cell biology studies and promise improved, nontoxic clinical tools to detect cells with overexpressed receptors as guidance for further surgical procedures.
In terms of oncogenes, ROBO2 (roundabout, axon guidance receptor, 2), a receptor of the SLIT2 axon guidance and cell migration growth factor, is associated with poor prognosis of breast cancer [ 35].
Roundabout 1 (ROBO1) encodes for an integral membrane protein that is both an axon guidance receptor and a cell adhesion receptor, and is involved in the decision by axons to cross the central nervous system midline [ 75].
In D. melanogaster it plays an essential role in neuronal wiring: it is an axon guidance receptor [ 6] and it ensures that olfactory receptor neurons synapse in the correct target [ 12].
Defects in crossing motor axons can arise from a number of sources including axon guidance receptors [50], [51], [52], receptor tyrosine phosphatase activity [53] and cytoskeletal modulation [54], [55].
The human homologue of the Drosophila roundabout gene, ROBO1, encodes an axon guidance receptor that is classified in a novel subfamily of the immunoglobulin (Ig) superfamily and is highly conserved in species ranging from fruit flies to mammals [9, 10].
