University of Massachusetts Medical School Faculty Publications

UMMS Affiliation

Department of Neurology

Publication Date

2019-09-19

Document Type

Article Preprint

Disciplines

Amino Acids, Peptides, and Proteins | Enzymes and Coenzymes | Genetic Phenomena | Genetics | Nervous System | Nervous System Diseases | Neuroscience and Neurobiology

Abstract

SPTLC1 encodes a critical subunit of serine palmitoyltransferase, the enzyme catalyzing the first and rate-limiting step in de novo sphingolipid biosynthesis, and mutations in this gene are known to cause hereditary sensory autonomic neuropathy, type 1A. Using exome sequencing, we identified a de novo variant in SPTLC1 resulting in a p.Ala20Ser amino acid change in an individual diagnosed with juvenile-onset amyotrophic lateral sclerosis (ALS) and confirmed its pathogenicity by showing elevated plasma levels of neurotoxic deoxymethyl-sphinganine. A second case of juvenile-onset ALS arising again from a p.Ala20Ser mutation was later identified, confirming the association of SPTLC1 with this form of motor neuron disease. We also found SPTLC1 mutations in 0.34% of 5,607 ALS cases, and immunohistochemically confirmed the expression of SPTLC1 in spinal cord motor neurons, supporting their role in the pathogenesis of this fatal neurological disease. We corrected the toxicity of deoxymethyl-sphinganine in HEK293FT cells using L-serine supplementation. Our data broaden the phenotype associated with SPTLC1 and suggest that nutritional supplementation with serine may be beneficial if instituted at an early stage among patients carrying mutations in SPTLC1.

Keywords

Genetics, mutations, amyotrophic lateral sclerosis, serine palmitoyltransferase, biosynthesis, hereditary sensory autonomic neuropathy, type 1A, SPTLC1

Rights and Permissions

The copyright holder for this preprint (which was not peer-reviewed) is the author/funder. It is made available under a CC0 license. This article is a US Government work. It is not subject to copyright under 17 USC 105.

DOI of Published Version

10.1101/770339

Source

bioRxiv 770339; doi: https://doi.org/10.1101/770339. Link to preprint on bioRxiv service.

Comments

Full author list omitted for brevity. For the full list of authors, see article.

Journal/Book/Conference Title

bioRxiv

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