The frequency of glucose-6-phosphate dehydrogenase (G-6-PD) deficiency in 50 Hb S homozygotes (SS) and 98 Hb S heterozygotes (AS) was determined and compared with the frequency obtained in individuals with normal haemoglobin (AA). The observed number of SS patients with G-6-PD deficiency was significantly greater than the expected value (p& < 0.05). The frequency of G-6-PD deficiency in AA, AS and SS was found to be 0.172, 0.214 and 0.420, respectively. A statistically significant increase of G-6-PD deficiency was apparent in the Saudi sicklers. The possibility that G-6-PD deficiency and Hb S gene interact, influencing the survival of the carriers of these genetic abnormalities, is discussed.

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