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Hematology. Sickle cell trait describes a condition in which a person has one abnormal allele of the hemoglobin beta gene (is heterozygous), but does not display the severe symptoms of sickle cell disease that occur in a person who has two copies of that allele (is homozygous). Those who are heterozygous for the sickle cell allele produce both ...
The protective effect of sickle cell trait does not apply to people with sickle cell disease; in fact, they are more vulnerable to malaria, since the most common cause of painful crises in malarial countries is infection with malaria. People with sickle cell disease living in malarial countries should receive lifelong medication for prevention ...
Heterozygous HbD/HbA trait, which does not affect the individuals. Heterozygous HbD-thalassemia, which causes the symptoms of thalassemia generally with mild anemia. Heterozygous HbS-D, which gives rise to sickle cell anemia, but generally milder and slower symptoms. Homozygous HbD/HbD, which is the rarest form, but is associated with HbD disease.
Hemoglobin E (HbE) is an abnormal hemoglobin with a single point mutation in the β chain. At position 26 there is a change in the amino acid, from glutamic acid to lysine (E26K). Hemoglobin E is very common among people of Southeast Asian, Northeast Indian, Sri Lankan and Bangladeshi descent. [1][2]
Hemoglobin C (abbreviated as HbC) is an abnormal hemoglobin in which glutamic acid residue at the 6th position of the β-globin chain is replaced with a lysine residue due to a point mutation in the HBB gene. [1] People with one copy of the gene for hemoglobin C do not experience symptoms, but can pass the abnormal gene on to their children.
With HbS, there can be mild sickle cell trait but no symptoms. [13] [14] Hemoglobin O-Arab causes sickle cell disease in heterozygous (HbS/HbO) individuals. However, the symptomatic anemia is mild and is not life-threatening. It is even milder than in heterozygous sickle cell trait (HbS/HbA). [15] A case of sickle cell retinopathy is documented ...
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