Caused by mutation in the dihydropyrimidine dehydrogenase gene (DPYD, 612779.0001). [MOLECULAR BASIS] Onset usually in infancy although later onset may occur [MISCELLANEOUS] Heterozygous mutation carriers show toxicity to 5-fluorouracil (5FU) [MISCELLANEOUS] Highly variable phenotype [MISCELLANEOUS] Some individuals are asymptomatic [MISCELLANEOUS]
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