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Dihydropyrimidine dehydrogenase deficiency

Dihydropyrimidine dehydrogenase deficiency is a disorder characterised by a wide range of severity, with neurological problems in some individuals and no signs or symptoms in others.

Beskrivning

Dihydropyrimidine dehydrogenase deficiency is a disorder characterised by a wide range of severity, with neurological problems in some individuals and no signs or symptoms in others.

In people with severe dihydropyrimidine dehydrogenase deficiency, the disorder becomes apparent in infancy. These affected individuals have neurological problems such as recurrent seizures (epilepsy), intellectual disability, a small head size (microcephaly), increased muscle tone (hypertonia), delayed development of motor skills such as walking, and autistic behaviors that affect communication and social interaction. Other affected individuals are asymptomatic, which means they do not have any signs or symptoms of the condition. Individuals with asymptomatic dihydropyrimidine dehydrogenase deficiency may be identified only by laboratory testing.

People with dihydropyrimidine dehydrogenase deficiency, including those who otherwise exhibit no symptoms, are vulnerable to severe, potentially life-threatening toxic reactions to certain drugs called fluoropyrimidines that are used to treat cancer. Common examples of these drugs are 5-fluorouracil and capecitabine. These drugs are not broken down efficiently by people with dihydropyrimidine dehydrogenase deficiency and build up to toxic levels in the body (fluoropyrimidine toxicity). Severe inflammation and ulceration of the lining of the gastrointestinal tract (mucositis) may occur, which can lead to signs and symptoms including mouth sores, abdominal pain, bleeding, nausea, vomiting, and diarrhea. Fluoropyrimidine toxicity may also lead to low numbers of white blood cells (neutropenia), which increases the risk of infections. It can also be associated with low numbers of platelets in the blood (thrombocytopenia), which impairs blood clotting and may lead to abnormal bleeding (hemorrhage). Redness, swelling, numbness, and peeling of the skin on the palms and soles (hand-foot syndrome); shortness of breath; and hair loss may also occur.

Inheritance patterns

The source lists the following possible inheritance patterns: Autosomal recessive; Autosomal dominant. More than one pattern can apply in different cases.

Other names

Dihydropyrimidinuria

DPD deficiency

Familial pyrimidemia

Hereditary thymine-uraciluria

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Vidare läsning och referenser

Artikelhistorik

Informationen på denna sida är skriven och granskad av kvalificerade kliniker.
  • 18 aug 2020 | Senaste versionen
  • 1 Nov 2011 | Ursprungligen publicerad

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