Glucose-6-phosphate dehydrogenase Buenos Aires: a novel de novo missense mutation associated with severe enzyme deficiency.
OBJECTIVE
: Glucose 6-phosphate dehydrogenase (G6PD) catalyzes the first committed steps in the pentose phosphate pathway: the generation of NADPH by this enzyme is essential for protection against oxidative stress. The human enzyme is in a dimer<-->tetramer equilibrium and its stability depends on NADP(+) concentration. Herein, we report a case of a symptomatic baby affected by severe deficiency of G6PD activity due to a novel de novo genetic mutation (g1465C>T) in the thirteenth exon of its gene.


METHODS
: Clinical, biochemical and genetic evaluations of the affected baby and his mother were performed.


RESULTS
: We found the g1465C>T novel mutation, in the thirteenth exon of G6PD gene (named "G6PD Buenos Aires variant"). This g1465C>T mutation produce a P489S substitution at protein level. The P489S mutation was absent in his mother, suggesting that G6PD Buenos Aires resulted from a de novo mutation.


CONCLUSIONS
: The absence of mosaicism in the baby's DNA (from saliva and blood samples) suggests that a de novo mutation event may occur in the very early stages in embryogenesis or in the mother's germ cell lines.
Minucci
Angelo
A
Laboratory of Clinical Molecular Biology Institute of Biochemistry and Clinical Biochemistry, Catholic University of Rome, Italy.
Concolino
Paola
P
Vendittelli
Francesca
F
Giardina
Bruno
B
Zuppi
Cecilia
C
Capoluongo
Ettore
E
D001483:Base Sequence; D005260:Female; D014644:Genetic Variation; D005954:Glucosephosphate Dehydrogenase / Q000097:blood / Q000235:genetics*; D005955:Glucosephosphate Dehydrogenase Deficiency / Q000097:blood / Q000175:diagnosis / Q000235:genetics*; D006801:Humans; D007223:Infant; D008297:Male; D008969:Molecular Sequence Data; D020125:Mutation, Missense / Q000235:genetics*; D012720:Severity of Illness Index
D005954:Glucosephosphate Dehydrogenase