Nck2 is essential for limb trajectory selection by spinal motor axons

Area of Science:

• Neuroscience
• Developmental Biology
• Molecular Biology

Background:

• Nervous system development relies on accurate axonal pathfinding.
• Cell surface receptors guide axons via cytoskeletal signaling, but mechanisms remain unclear.
• The Nck2 adaptor protein's role in motor axon guidance was investigated.

Purpose of the Study:

• To elucidate the function of Nck2 in motor axon trajectory selection.
• To understand Nck2's role in Eph-mediated axon guidance.
• To explore Nck2's interaction with α2-chimaerin in axon guidance.

Main Methods:

• Investigated Nck2 expression in chick LMC neurons.
• Utilized in ovo electroporation for Nck2 loss- and gain-of-function studies.
• Performed in vitro neurite growth assays and in vivo axon redirection experiments.

Main Results:

• Nck2 is preferentially expressed in LMC neurons during axon pathfinding.
• Altering Nck2 levels in LMC neurons disrupted motor axon trajectory selection.
• Nck2 modulates neurite growth preference against ephrins and Eph-mediated axon redirection.

Conclusions:

• Nck2 is essential for Eph-mediated axon trajectory selection in spinal motor neurons.
• Nck2 likely functions by modulating α2-chimaerin activity.
• This study highlights Nck2's critical role in neural development.