Abstract
Background
Monoallelic variants in the KIF1A gene are associated with a large set of clinical phenotypes including neurodevelopmental and neurodegenerative disorders, underpinned by a broad spectrum of central and peripheral nervous system involvement.
Methods
In a multicenter study conducted in patients presenting spastic gait or complex neurodevelopmental disorders, we analyzed the clinical, genetic and neuroradiological features of 28 index cases harboring heterozygous variants in KIF1A. We conducted a literature systematic review with the aim to comparing our findings with previously reported KIF1A-related phenotypes.
Results
Among 28 patients, we identified nine novel monoallelic variants, and one a copy number variation encompassing KIF1A. Mutations arose de novo in most patients and were prevalently located in the motor domain. Most patients presented features of a continuum ataxia-spasticity spectrum with only five cases showing a prevalently pure spastic phenotype and six presenting congenital ataxias. Seventeen mutations occurred in the motor domain of the Kinesin-1A protein, but location of mutation did not correlate with neurological and imaging presentations. When tested in 15 patients, muscle biopsy showed oxidative metabolism alterations (6 cases), impaired respiratory chain complexes II + III activity (3/6) and low CoQ10 levels (6/9). Ubiquinol supplementation (1gr/die) was used in 6 patients with subjective benefit.
Conclusions
This study broadened our clinical, genetic, and neuroimaging knowledge of KIF1A-related disorders. Although highly heterogeneous, it seems that manifestations of ataxia-spasticity spectrum disorders seem to occur in most patients. Some patients also present secondary impairment of oxidative metabolism; in this subset, ubiquinol supplementation therapy might be appropriate.
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Change history
15 October 2021
A Correction to this paper has been published: https://doi.org/10.1007/s00415-021-10839-5
16 February 2023
A Correction to this paper has been published: https://doi.org/10.1007/s00415-023-11589-2
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Acknowledgements
We thank Catherine J. Wrenn for expert editing of the manuscript and critical advice on tables and figures. We are indebted to our colleagues who referred patients with spastic-ataxia for gene screening.
Funding
This research was partially supported by Grants MITO-NEXT and MINDFUL CC-2019-2366613 (to FMS), RC 5 × 1000 2020–2021 (to AT, RB, and AR), and RF-2019-12370112 (to AT and MTB) from the Italian Ministry of Health. We also acknowledge the financial support of DECODE-EE Tuscany Region Call for Health 2018 (to RG).
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Conceptualization: [SDV, AT, AR, CD, FMS]; Acquisition data: [SDV, AT, AR, CD, AA, RP, GA, MTB, RB, CC, EC, GC, GDM, ARF, AF, CF, CF, SG, CG, RG, SH, DL, FM, AMa, AMi, AP, AMP, FP, GP, EP, RR, AR, CSan, SS, CSp, CT]. Methodology: [SDV, AT, CD, AR]; Formal analysis and investigation: [SDV, AT, CD, AR, JB, RP]; Writing—original draft preparation: [SDV, AT, CD, AR, JB, FMS]; Writing—review and editing: [SDV, AT, AR, FMS]; Critical revision: [SDV, AT, AR, CD, RP, GA, MTB, RB, CC, EC, GC, GDM, ARF, AF, CF, CF, SG, RG, EPa, DL, FM, AM, AP, AMP, FP, GP, EPr, AR, SS, CS, CT, FMS]; Funding acquisition: [FMS]; Resources: [FMS, RG]; Supervision: [FMS, AT]. All authors fully comply with and approve the version to be published.
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The authors declare no conflict of interest.
Ethical standards
This study was approved by the Tuscany Regional Pediatric Ethics Committee and written informed consent was obtained from the patients.
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Appendix
. Detailed genetic information on KIF1A variants reported in our cohort. (XLSX 13 KB)
Figure S1
. Family pedigrees. Figure S2. (A) Pie chart and histogram showing the clinical manifestations in our cohort of 28 patients. The relative Human Phenotype Ontology codes are given in brackets. (B) Histogram showing the neuroradiological findings (MRI) in 27 members of our cohort. The relative Human Phenotype Ontology codes are given in brackets. Figure S3. (A) Histogram showing the clinical manifestations of the patients with congenital ataxia in our cohort (n=6). The relative Human Phenotype Ontology codes are given in brackets. GDD: Global developmental delay. ID: Intellectual disability. (B) Histogram showing the neuroradiological findings in the patients with congenital ataxia in our cohort (n=6). The relative Human Phenotype Ontology codes are given in brackets. Figure S4. Myo-pathological changes in patients with KIF1A mutations: a) Hematoxylin and eosin staining demonstrating marked variation in fiber size in Pt9. b) Oil Red O Stain showing mild lipid storage in Pt5. (PDF 1167 KB)
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Vecchia, S.D., Tessa, A., Dosi, C. et al. Monoallelic KIF1A-related disorders: a multicenter cross sectional study and systematic literature review. J Neurol 269, 437–450 (2022). https://doi.org/10.1007/s00415-021-10792-3
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DOI: https://doi.org/10.1007/s00415-021-10792-3