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. 2019 Jun 12;5(4):e344.
doi: 10.1212/NXG.0000000000000344. eCollection 2019 Aug.

Altered CSF levels of monoamines in hereditary spastic paraparesis 10: A case series

Mattias Andréasson  1 , Kristina Lagerstedt-Robinson  1 , Kristin Samuelsson  1 , Göran Solders  1 , Kaj Blennow  1 , Martin Paucar  1 , Per Svenningsson  1
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Altered CSF levels of monoamines in hereditary spastic paraparesis 10: A case series

Mattias Andréasson et al. Neurol Genet. .

Abstract

Objective: To perform a comprehensive clinical characterization and biochemical CSF profile analyses in 2 Swedish families with hereditary spastic paraparesis (HSP) 10 (SPG10) caused by 2 different mutations in the neuronal kinesin heavy chain gene (KIF5A).

Methods: Structured clinical assessment, genetic studies, and neuroradiologic and electrophysiological evaluations were performed in 4 patients from 2 families with SPG10. Additional CSF analysis was conducted in 3 patients with regard to levels of neurodegenerative markers and monoamine metabolism.

Results: All patients exhibited a complex form of HSP with a mild to moderate concurrent axonal polyneuropathy. The heterozygous missense mutations c.767A>G and c.967C>T in KIF5A were found. Wide intrafamilial phenotype variability was evident in both families. CSF analysis demonstrated a mild elevation of neurofilament light (NFL) chain in the patient with longest disease duration. Unexpectedly, all patients exhibited increased levels of the dopamine metabolite, homovanillic acid, whereas decreased levels of the noradrenergic metabolite, 3-methoxy-4-hydroxyphenylglycol, were found in 2 of 3 patients.

Conclusions: We report on CSF abnormalities in SPG10, demonstrating that NFL elevation is not a mandatory finding but may appear after long-standing disease. Impaired transportation of synaptic proteins may be a possible explanation for the increased dopaminergic turnover and noradrenergic deficiency identified. The reasons for these selective abnormalities, unrelated to obvious clinical features, remain to be explained. Our findings need further confirmation in larger cohorts of patients harboring KIF5A mutations.

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Figures

Figure
Figure. Pedigrees of the 2 Swedish families with SPG10
Pedigrees of family A and B harboring the c.767A>G (p.Asn256Ser) and c.967C>T (p.Arg323Trp) mutations in KIF5A, respectively. Patient I:1 in family A, due to lack of comprehensive medical notes, is considered possibly symptomatic based on historical description.
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