1. Mutations in the SPTLC1 gene are a cause of juvenile amyotrophic lateral sclerosis that may be amenable to serine supplementation
- Author
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Pentti J. Tienari, Al-Saif H, Ruth Chia, Jinhui Ding, Janel O. Johnson, Claire Troakes, Maura Brunetti, Emily Bonkowski, Mark R. Cookson, Gabriele Mora, Pamela J. Shaw, Adriano Chiò, Simon Topp, Mike A. Nalls, Ammar Al-Chalabi, Bryan J. Traynor, Christopher Shaw, Carol Dobson-Stone, Natalie Landeck, Leigh F, Nada Alahmady, Nathan A. Smith, Olga Pletnikova, David J. Stone, Ian P. Blair, Robert H. Brown, Chang Ij, Thomas O. Crawford, Silani, Marc Gotkine, Alfredo Iacoangeli, Juan C. Troncoso, Karen E. Morrison, Ian A. Glass, Sarah A. Ahmed, Gibbs, Alan E. Renton, Marya S. Sabir, Aleksey Shatunov, Sonja W. Scholz, Li R, Bradley N. Smith, John Landers, Ravindran Kumaran, John B.J. Kwok, Ashley R. Jones, Andrea Calvo, Danny E. Miller, C. Gellera, Faraz Faghri, Hannah A. Pliner, England Bk, Nicola Ticozzi, Yevgeniya Abramzon, Al Khleifat A, Seth J. Perlman, and Clifton L. Dalgard
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0303 health sciences ,Mutation ,business.industry ,Serine C-palmitoyltransferase ,Motor neuron ,medicine.disease ,medicine.disease_cause ,3. Good health ,Pathogenesis ,Serine ,03 medical and health sciences ,0302 clinical medicine ,medicine.anatomical_structure ,medicine ,Cancer research ,Amyotrophic lateral sclerosis ,SPTLC1 ,business ,030217 neurology & neurosurgery ,Exome sequencing ,030304 developmental biology - 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 .
- Published
- 2019
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