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It is possible for a person to have both the gene for hemoglobin S (the form associated with sickle cell anemia) and the gene for hemoglobin C; this state is called hemoglobin SC disease, and is generally more severe than hemoglobin C disease, but milder than sickle cell anemia.
Sickle cell test. A urologist might request this test for men with a higher risk of sickle cell disease. Duplex ultrasound. Sometimes called ultrasonography, this can measure blood flow in your ...
Sickle hemoglobin (HbS) is the most common variant of hemoglobin and arises due to an amino acid substitution in the beta-globin subunit at the sixth residue from glutamic acid to valine. There are different forms of sickle cell disease. HB SS which is the most common and severe form of sickle cell.
He has written four books and approximately 500 papers on sickle-cell disease. His work addressed the variability of sickle-cell disease with special emphasis on developing low-cost models of management suitable to countries with large numbers of patients and limited resources.
The pathogen that causes the disease spends part of its cycle in the red blood cells and triggers an abnormal drop in oxygen levels in the cell. In carriers, this drop is sufficient to trigger the full sickle-cell reaction, which leads to infected cells being rapidly removed from circulation and strongly limiting the infection's progress.
This would be similar to the hemoglobin allele which is responsible for sickle-cell disease, but solely in people with two copies; those with just one copy of the allele have a sickle cell trait and gain partial immunity to malaria as a result. This effect is called heterozygote advantage. [27]
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