CNTN2 (contactin 2) encodes a glycosylphosphatidylinositol-anchored neuronal membrane protein that plays a critical role in organizing axonal domains at nodes of Ranvier 1. In conjunction with CNTNAP2, CNTN2 maintains voltage-gated potassium channels at the juxtaparanodal region, which is essential for proper neuronal excitability 1. The protein functions through intermolecular interactions that are crucial for myelinated axon integrity and functionality 2. CNTN2 has been implicated in various neurological disorders. A homozygous frameshift mutation (c.503_503delG) in CNTN2 was identified in a consanguineous family with autosomal recessive cortical myoclonic tremor and epilepsy 1. The gene has also been identified as a candidate for idiopathic generalized epilepsy through gene-gene interaction network analysis 3. Additionally, CNTN2 variants contribute to progressive supranuclear palsy risk, with a novel locus identified in NFASC/CNTN2 reaching genome-wide significance 45. In gliomas, CNTN2 interacts with RACK1 and promotes cell proliferation while inhibiting differentiation through the RTK/Ras/MAPK pathway 6. The protein's involvement in oligodendrocyte function and myelination processes suggests its importance in maintaining nervous system integrity 4.