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Compound heterozygous mutations in two different domains of ALDH18A1 do not affect the amino acid levels in a patient with hereditary spastic paraplegia

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Mutations in ALDH18A1 can cause autosomal recessive and dominant hereditary spastic paraplegia and autosomal recessive and dominant cutis laxa. ALDH18A1 encodes delta-1-pyrroline-5-carboxylate synthetase (P5CS), which consists of two domains, the glutamate 5-kinase (G5K) and the gamma-glutamyl phosphate reductase (GR5P) domain. The location of the mutations in the gene has influence on whether the amino acid levels are affected. Mutations affecting the G5K domain have previously been found to cause reduced plasma levels of proline, citrulline and arginine, whereas such effect is not seen with mutations affecting the GR5P domain. We present a 19-year old male patient with autosomal recessive spastic paraplegia and compound heterozygosity for two ALDH18A1 mutations, one in each of the P5CS domains. This young man has spastic paraplegia with onset in childhood and temporal lobe epilepsy, but normal levels of proline, ornithine and arginine. To our knowledge, this is the first case with compound heterozygous mutations affecting both P5CS domains, where levels of plasma amino acids have been reported.

OriginalsprogEngelsk
TidsskriftNeurogenetics
Vol/bind19
Udgave nummer3
Sider (fra-til)145-149
ISSN1364-6745
DOI
StatusUdgivet - 12 maj 2018

ID: 56082980