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Sickle-cell versions of hemoglobin stick to themselves, stacking to form fibers that distort the shape of red blood cells carrying the protein. These sickle-shaped cells no longer flow smoothly through blood vessels, having a tendency to clog or degrade, causing the medical problems associated with this disease. [citation needed]
Several occupational health screening measures similar to genetic testing are already taking place. For example, in 1978, DuPont reported testing African American applicants for sickle cell trait and restricted these workers from exposure to nitro and amino compounds. [71]
"Sickle Cell Anemia, a Molecular Disease" is a 1949 scientific paper by Linus Pauling, Harvey A. Itano, Seymour J. Singer and Ibert C. Wells that established sickle-cell anemia as a genetic disease in which affected individuals have a different form of the metalloprotein hemoglobin in their blood.
Testing HbA2 levels can be challenging because different disorders can cause it to have higher or lower values. Testing for the beta-thalassemia trait is usually identified when the value of HbA2 is higher than 3.5%. [3] HbA2 is also important for diagnosing sickle cell disease, which is one of the most prevalent genetic conditions.
Sickle cell disease consists of several subtypes; however, the Haemoglobin type C (HbSC) subtype carries the gravest prognosis for sickle cell retinopathy and vision changes. [ 2 ] Regular retinal examinations can aid in early detection and treatment, thus reducing the impact of the condition and the risk of vision loss.
This has led to the hypothesis that while homozygotes for the sickle cell gene suffer from disease, heterozygotes might be protected against malaria. [27] Malaria remains a selective factor for the sickle cell trait. [28]