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Two novel missense mutations of the OCTN2 gene (W283R and V446F) in a patient with primary systemic carnitine deficiency

✍ Scribed by E. Mayatepek; J. Nezu; I. Tamai; A. Oku; M. Katsura; M. Shimane; A. Tsuji

Publisher
John Wiley and Sons
Year
2000
Tongue
English
Weight
20 KB
Volume
15
Category
Article
ISSN
1059-7794

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✦ Synopsis

Primary systemic carnitine deficiency (SCD) is an autosomal recessive disorder of fatty acid oxidation caused by defective cellular carnitine transport. The disease is characterized by metabolic derangement simulating Reye´s syndrome, hypoglcaemia, progressive cardiomyopathy and skeletal myopathy. Recently, it was shown that SCD is caused by mutations in the organic cation/carnitine transporter OCTN2 (SLC22A5). We report two novel mutations, W283R and V446F, which are both missense mutations in an affected infant. In vitro expression studies demonstrated that both are actually function-loss mutations with virtually no uptake activity. This is the first report of compound heterozygosity for two missense mutations in a patient with SCD.

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