A Case of CACNA1I-Related Neurodevelopmental Disorder With Dysmorphism and Brain Iron Accumulation: Expanding the Clinical Spectrum

Recently, gain- or loss-of-function variants in the calcium voltage-gated channel subunit alpha1I gene (CACNA1I) have been shown to cause neurodevelopmental disorders. As only 10 cases have been reported to date, clinical information remains limited. This article describes a patient carrying a previously identified CACNA1I variant (NM_021096.4: c.2579T>A, p.Ile860Asn). Notably, our patient exhibited previously unreported clinical findings resembling those observed in disorders associated with other CACNA1 family members, suggesting that these features may be characteristic of this disorder. Brain MRI revealed previously unreported excess iron accumulation in the globus pallidus and substantia nigra. These findings indicate that this disorder may be part of the spectrum of neurodegeneration with brain iron accumulation.