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Mutation in CPT1C Associated With Pure Autosomal Dominant Spastic Paraplegia. 2015

Carlo Rinaldi, and Thomas Schmidt, and Alan J Situ, and Janel O Johnson, and Philip R Lee, and Ke-Lian Chen, and Laura C Bott, and Rut Fadó, and George H Harmison, and Sara Parodi, and Christopher Grunseich, and Benoît Renvoisé, and Leslie G Biesecker, and Giuseppe De Michele, and Filippo M Santorelli, and Alessandro Filla, and Giovanni Stevanin, and Alexandra Dürr, and Alexis Brice, and Núria Casals, and Bryan J Traynor, and Craig Blackstone, and Tobias S Ulmer, and Kenneth H Fischbeck
Neurogenetics Branch, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, Maryland.

OBJECTIVE The family of genes implicated in hereditary spastic paraplegias (HSPs) is quickly expanding, mostly owing to the widespread availability of next-generation DNA sequencing methods. Nevertheless, a genetic diagnosis remains unavailable for many patients. OBJECTIVE To identify the genetic cause for a novel form of pure autosomal dominant HSP. METHODS We examined and followed up with a family presenting to a tertiary referral center for evaluation of HSP for a decade until August 2014. Whole-exome sequencing was performed in 4 patients from the same family and was integrated with linkage analysis. Sanger sequencing was used to confirm the presence of the candidate variant in the remaining affected and unaffected members of the family and screen the additional patients with HSP. Five affected and 6 unaffected participants from a 3-generation family with pure adult-onset autosomal dominant HSP of unknown genetic origin were included. Additionally, 163 unrelated participants with pure HSP of unknown genetic cause were screened. METHODS Mutation in the neuronal isoform of carnitine palmitoyl-transferase (CPT1C) gene. RESULTS We identified the nucleotide substitution c.109C>T in exon 3 of CPT1C, which determined the base substitution of an evolutionarily conserved Cys residue for an Arg in the gene product. This variant strictly cosegregated with the disease phenotype and was absent in online single-nucleotide polymorphism databases and in 712 additional exomes of control participants. We showed that CPT1C, which localizes to the endoplasmic reticulum, is expressed in motor neurons and interacts with atlastin-1, an endoplasmic reticulum protein encoded by the ATL1 gene known to be mutated in pure HSPs. The mutation, as indicated by nuclear magnetic resonance spectroscopy studies, alters the protein conformation and reduces the mean (SD) number (213.0 [46.99] vs 81.9 [14.2]; P < .01) and size (0.29 [0.01] vs 0.26 [0.01]; P < .05) of lipid droplets on overexpression in cells. We also observed a reduction of mean (SD) lipid droplets in primary cortical neurons isolated from Cpt1c-/- mice as compared with wild-type mice (1.0 [0.12] vs 0.44 [0.05]; P < .001), suggesting a dominant negative mechanism for the mutation. CONCLUSIONS This study expands the genetics of autosomal dominant HSP and is the first, to our knowledge, to link mutation in CPT1C with a human disease. The association of the CPT1C mutation with changes in lipid droplet biogenesis supports a role for altered lipid-mediated signal transduction in HSP pathogenesis.

UI MeSH Term Description Entries
D007558 Italy A country in southern Europe, a peninsula extending into the central Mediterranean Sea, northeast of Tunisia. The capital is Rome. Sardinia
D008875 Middle Aged An adult aged 45 - 64 years. Middle Age
D009154 Mutation Any detectable and heritable change in the genetic material that causes a change in the GENOTYPE and which is transmitted to daughter cells and to succeeding generations. Mutations
D010375 Pedigree The record of descent or ancestry, particularly of a particular condition or trait, indicating individual family members, their relationships, and their status with respect to the trait or condition. Family Tree,Genealogical Tree,Genealogic Tree,Genetic Identity,Identity, Genetic,Family Trees,Genealogic Trees,Genealogical Trees,Genetic Identities,Identities, Genetic,Tree, Family,Tree, Genealogic,Tree, Genealogical,Trees, Family,Trees, Genealogic,Trees, Genealogical
D002334 Carnitine O-Palmitoyltransferase An enzyme that catalyzes reversibly the conversion of palmitoyl-CoA to palmitoylcarnitine in the inner mitochondrial membrane. EC 2.3.1.21. Carnitine Palmitoyltransferase,CPT II,Carnitine Acyltransferase I,Carnitine Palmitoyltransferase I,Carnitine Palmitoyltransferase II,Palmitoylcarnitine Transferase,Palmitylcarnitine Acyltransferase,Acyltransferase I, Carnitine,Acyltransferase, Palmitylcarnitine,Carnitine O Palmitoyltransferase,II, Carnitine Palmitoyltransferase,O-Palmitoyltransferase, Carnitine,Palmitoyltransferase I, Carnitine,Palmitoyltransferase II, Carnitine,Palmitoyltransferase, Carnitine,Transferase, Palmitoylcarnitine
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000328 Adult A person having attained full growth or maturity. Adults are of 19 through 44 years of age. For a person between 19 and 24 years of age, YOUNG ADULT is available. Adults
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia
D015419 Spastic Paraplegia, Hereditary A group of inherited diseases that share similar phenotypes but are genetically diverse. Different genetic loci for autosomal recessive, autosomal dominant, and x-linked forms of hereditary spastic paraplegia have been identified. Clinically, patients present with slowly progressive distal limb weakness and lower extremity spasticity. Peripheral sensory neurons may be affected in the later stages of the disease. (J Neurol Neurosurg Psychiatry 1998 Jan;64(1):61-6; Curr Opin Neurol 1997 Aug;10(4):313-8) Hereditary Spastic Paraplegia,X-Linked, Spastic Paraplegia, Hereditary,Autosomal Dominant Hereditary Spastic Paraplegia,Autosomal Dominant Spastic Paraplegia Hereditary,Autosomal Recessive Hereditary Spastic Paraplegia,Autosomal Recessive Spastic Paraplegia, Hereditary,CMT with Pyramidal Features,Charcot-Marie-Tooth Disease with Pyramidal Features, Autosomal Dominant,HMSN 5,HMSN Type V,HMSN V,HMSN V (Hereditary Motor and Sensory Neuropathy Type V),Hereditary Autosomal Dominant Spastic Paraplegia,Hereditary Autosomal Recessive Spastic Paraplegia,Hereditary Motor And Sensory Neuropathy V,Hereditary Motor and Sensory Neuropathy 5,Hereditary Motor-Sensory Neuropathy with Pyramidal Signs,Hereditary Spastic Paraplegia, Autosomal Recessive,Hereditary X-Linked Recessive Spastic Paraplegia,Hereditary, Spastic Paraplegia, Autosomal Dominant,Hereditary, Spastic Paraplegia, X-Linked Recessive,Hypertrophic Motor-Sensory Neuropathy-Spastic Paraplegia,Paraplegia, Spastic, Hereditary,Peroneal Muscular Atrophy with Pyramidal Features, Autosomal Dominant,Spastic Paraplegia 2,Spastic Paraplegia Type 2,Spastic Paraplegia, Autosomal Dominant, Hereditary,Spastic Paraplegia, Autosomal Recessive, Hereditary,Spastic Paraplegia, Hereditary, Autosomal Dominant,Spastic Paraplegia, Hereditary, Autosomal Recessive,Spastic Paraplegia, Hereditary, X-Linked Recessive,Spastic Paraplegia, X-Linked Recessive, Hereditary,Spastic Paraplegia-Hypertrophic Motor-Sensory Neuropathy,Type V Hereditary Motor and Sensory Neuropathy,X Linked Recessive Hereditary Spastic Paraplegia,X-linked Recessive Hereditary Spastic Paraplegia,Charcot Marie Tooth Disease with Pyramidal Features, Autosomal Dominant,Hereditary Motor Sensory Neuropathy with Pyramidal Signs,Hereditary Spastic Paraplegias,Hereditary X Linked Recessive Spastic Paraplegia,Hypertrophic Motor Sensory Neuropathy Spastic Paraplegia,Paraplegia, Hereditary Spastic,Paraplegias, Hereditary Spastic,Spastic Paraplegia Hypertrophic Motor Sensory Neuropathy,Spastic Paraplegias, Hereditary,Type V, HMSN
D051379 Mice The common name for the genus Mus. Mice, House,Mus,Mus musculus,Mice, Laboratory,Mouse,Mouse, House,Mouse, Laboratory,Mouse, Swiss,Mus domesticus,Mus musculus domesticus,Swiss Mice,House Mice,House Mouse,Laboratory Mice,Laboratory Mouse,Mice, Swiss,Swiss Mouse,domesticus, Mus musculus

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