DSCAML1 (Down syndrome cell adhesion molecule like 1) is a transmembrane cell adhesion molecule that plays critical roles in neural circuit development and function. The protein promotes neuronal self-avoidance through homophilic interactions, facilitating proper neural wiring and synaptic connectivity in the retina and other brain regions 1. DSCAML1 is essential for maintaining rod-to-rod bipolar cell synapses in the retina, with loss-of-function mutations causing structural defects including altered dendritic morphology and mitochondrial abnormalities 2. The protein is required for proper GABAergic neuron placement in the entorhinal cortex, as DSCAML1 deficiency leads to reduced inhibitory neurons and enhanced seizure susceptibility 3. Functional studies in zebrafish demonstrate that dscaml1 mutations cause specific oculomotor deficits including impaired saccadic eye movements and gaze stabilization, resembling human ocular motor apraxia 4. DSCAML1 mutations have been associated with neurodevelopmental disorders, with mutant proteins showing altered glycosylation, increased degradation, and loss of synaptic regulatory function 5. Additionally, genetic variants in DSCAML1 have been linked to abnormal sperm morphology, suggesting broader developmental roles beyond the nervous system 6.