• Internal medicine · Oct 2023

    Case Reports

    Long-term Observation of a Japanese Patient with a Multiple-system Neurodegenerative Disorder with a Uniallelic de novo Missense Variant in KIF1A.

    • Katsuya Nakamura, Tsuneaki Yoshinaga, Minori Kodaira, Emiko Kise, Tomoki Kosho, and Yoshiki Sekijima.
    • Center for Medical Genetics, Shinshu University Hospital, Japan.
    • Intern. Med. 2023 Oct 15; 62 (20): 304730513047-3051.

    AbstractWe encountered a 37-year-old Japanese man with KIF1A-associated neurological disorder (KAND) who exhibited motor developmental delay, intellectual disability, and slowly progressive cerebellar ataxia, hypotonia, and optic neuropathy. Pyramidal tract signs were evident late in this case. At 30 years old, the patient developed a neurogenic bladder. A molecular diagnosis revealed a uniallelic missense de novo variant (p.L278P) of KIF1A. Serial neuroradiological studies revealed atrophy of the cerebellum at an early age, and cerebral hemisphere atrophy progressed slowly over a 22-year observation period. Our study suggests that the primary etiology of KAND may be acquired, long-standing neurodegeneration rather than congenital hypoplasia.

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