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Definition of G6PD deficiency
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G6PD deficiency Main Article
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the who, what, when and how of G6PD deficiency
G6PD deficiency definition - medical term
Deficiency of the enzyme glucose-6-phosphate dehydrogenase
(G6PD), the most common enzyme defect of medical importance. About 10 percent of
American black males have G6PD deficiency, as do a lesser percent of black females.
G6PD deficiency is also increased in frequency in people of Mediterranean origin
(including Italians, Greeks, Arabs, and Jews). The gene encoding G6PD is on the
X chromosome. Males with this enzyme deficiency may develop anemia due to the breakup
of their red blood cells when they are exposed to oxidant drugs, naphthalene moth
balls, or fava beans. The offending drugs include the antimalarial primaquine, salicylates,
sulfonamide antibiotics, nitrofurans, phenacetin, and some vitamin K derivatives.
Fever, viral and bacterial infections, and diabetic acidosis can also precipitate
a hemolytic crisis (when the red blood cells break up), resulting in anemia and
jaundice. The concentration of G6PD deficiency in certain populations is believed
to reflect a protective effect it afforded (much like sickle cell trait) against
malaria.
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