KIF1A and intellectual disability, autosomal dominant 9: Pathogenic variants in the KIF1A gene have been associated with a wide spectrum of neurological phenotypes (Nemani et al., 2020) ranging from recessive hereditary sensory neuropathy-type IIC (HSNIIC) to autosomal recessive or dominant hereditary spastic paraplegia 30 (SPG30) and to the most severe NESCAV syndrome (NESCAVS).