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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Mutation analysis of the GALT gene in Czech and Slovak galactosemia populations: identification of six novel mutations, including a stop codon mutation (X380R).
Human Mutation 2000 Februrary
A study of the galactose-1-phosphate uridyltransferase (GALT) gene from 37 unrelated galactosemia families is reported here. A total of 16 sequence variations in eleven mutated alleles was found. The two most common molecular defects were the mutations Q188R (46.0%) and K285N (25.7%). Six novel mutations in the GALT gene, X380R, Y209S, E340K, L74fsdelCT, Q169K and L256/P257delGCC, were detected. Three mutations, V151A, L195P and R204X that were previously described in other populations, were also found. The mutation X380R, which breaks the stop codon of the GALT gene, causes elongation of the GALT enzyme's protein chain. A deletion of four nucleotides in the 5' promoter region, in a position 116 - 119 nucleotides upstream from the initiate codon (5'UTR-119delGTCA), was revealed in Duarte (D2) alleles, in addition to N314D, IVS4nt-27g-->c, IVS5nt+62g-->a, and IVS5nt-24g-->a. An unusual molecular genotype was observed on 2 types of classical galactosemia alleles, with six variations from the normal nucleotide sequence presented in cis (mutation V151A or E340K plus five Duarte (D2) characteristic variations). In summary, galactosemia is a heterogeneous disorder at the molecular level, and mutation N314D, appears to be an ancient genetic variant of the GALT gene. Hum Mutat 15:206, 2000.
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