A mild phenotype of dihydropyrimidine dehydrogenase deficiency and developmental retardation associated with a missense mutation affecting cofactor binding.

OBJECTIVES

Evaluation of a non-synonymous mutation associated with dihydropyrimidine dehydrogenase (DPD) deficiency.

DESIGN AND

METHODS

DPD enzyme analysis, mutation analysis and molecular dynamics simulations based on the 3D-model of DPD.

RESULTS

The substitution Lys63Glu is likely to affect the FAD binding pocket within the DPD protein and contributes to a near-complete DPD deficiency in a patient with developmental retardation.

CONCLUSIONS

Like other DPD variants attenuating FAD binding, Lys63Glu should be included in screening for DPD deficiency.