OPHN1 (oligophrenin 1) encodes a Rho-GTPase-activating protein that plays critical roles in neuronal development and synaptic function 1. The protein is essential for dendritic morphogenesis and synaptic plasticity, belonging to the Rho GTPase signaling pathway involved in neuronal differentiation 2. OPHN1 undergoes complex post-transcriptional modifications including A-to-I RNA editing and alternative splicing during human brain development, with editing detectable at 18 weeks gestation and increasing significantly between weeks 20-33 1. Mutations in OPHN1 cause X-linked intellectual disability with distinctive features including moderate to severe mental retardation, myoclonic-astatic epilepsy, ataxia, strabismus, and hypogenitalism 3. The syndrome also presents with characteristic neuroimaging findings including fronto-temporal atrophy, rostral ventricular enlargement, lower vermian agenesis, and asymmetric cerebellar hypoplasia 3. These mutations represent a recognizable syndrome rather than non-syndromic mental retardation 3. Recent studies have identified OPHN1's potential involvement in oligogenic epilepsy mechanisms, where it interacts with other genes to contribute to refractory epilepsy phenotypes 4. Additionally, OPHN1 variants have been detected in patients with primary male infertility, suggesting broader reproductive implications 5.