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German, Alexander; Jukic, Jelena; Laner, Andreas; Arnold, Philipp; Socher, Eileen; Mennecke, Angelika; Schmidt, Manuel A; Winkler, Jürgen; Abicht, Angela; Regensburger, Martin
Genes, 01/2024, Letnik: 15, Številka: 1Journal Article
Fatty acid hydroxylase-associated neurodegeneration (FAHN/SPG35) is caused by pathogenic variants in and has been linked to a continuum of specific motor and non-motor neurological symptoms, leading to progressive disability. As an ultra-rare disease, its mutational spectrum has not been fully elucidated. Here, we present the prototypical workup of a novel variant, including clinical and in silico validation. An 18-year-old male patient presented with a history of childhood-onset progressive cognitive impairment, as well as progressive gait disturbance and lower extremity muscle cramps from the age of 15. Additional symptoms included exotropia, dystonia, and limb ataxia. Trio exome sequencing revealed a novel homozygous c.75C>G (p.Cys25Trp) missense variant in the gene, which was located in the cytochrome b5 heme-binding domain. Evolutionary conservation, prediction models, and structural protein modeling indicated a pathogenic loss of function. Brain imaging showed characteristic features, thus fulfilling the complete multisystem neurodegenerative phenotype of FAHN/SPG35. In summary, we here present a novel variant and provide prototypical clinical findings and structural analyses underpinning its pathogenicity.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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