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Two CPT2 mutations in three Japanese patients with carnitine palmitoyltransferase II deficiency: Functional analysis and association with polymorphic haplotypes and two clinical phenotypes
Author(s) -
Wataya Kaoru,
Akanuma Jun,
Cavadini Patrizia,
Aoki Yoko,
Kure Shigeo,
Invernizzi Federica,
Yoshida Ichiro,
Kira Junichi,
Taroni Franco,
Matsubara Yoichi,
Narisawa Kuniaki
Publication year - 1998
Publication title -
human mutation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.981
H-Index - 162
eISSN - 1098-1004
pISSN - 1059-7794
DOI - 10.1002/(sici)1098-1004(1998)11:5<377::aid-humu5>3.0.co;2-e
Subject(s) - biology , missense mutation , compound heterozygosity , genetics , haplotype , mutation , allele , microbiology and biotechnology , phenylalanine hydroxylase , gene , amino acid , phenylalanine
Carnitine palmitoyltransferase II (CPT II) deficiency manifests as two different clinical phenotypes: a muscular form and a hepatic form. We have investigated three nonconsanguineous Japanese patients with CPT II deficiency. Molecular analysis revealed two missense mutations, a glutamate (174)‐to‐lysine substitution (E174K) and a phenylalanine (383)‐to‐tyrosine substitution (F383Y) in the CPT II cDNA. Transfection experiments in COS‐1 cells demonstrated that the two mutations markedly decreased the catalytic activity of mutant CPT II. Case 1 (hepatic form) was homozygous for the F383Y mutation, whereas case 3 (muscular form) was homozygous for the E174K mutation. Case 2 and her brother, who were compound heterozygotes for E174K and F383Y, exhibited the hepatic phenotype. We also identified a novel polymorphism in the CPT2 gene, a phenylalanine (352)‐to‐cysteine substitution (F352C), which did not alter CPT II activity in transfected cells. It was present in 21 out of 100 normal alleles in the Japanese population, but absent in Caucasian populations. Genotyping with the F352C polymorphism and the two previously reported polymorphisms, V368I and M647V, allowed normal Japanese alleles to be classified into five haplotypes. In all three families with CPT II deficiency, the E174K mutation resided only on the F1V1M1 allele, whereas the F383Y mutation was observed on the F2V2M1 allele, suggesting a single origin for each mutation. Hum Mutat 11:377–386, 1998. © 1998 Wiley‐Liss, Inc.

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