how did sickle cell anemia come about?
37854
The origin of the mutation that led to the sickle-cell gene derives from at least four independent mutational events, three in Africa and a fourth in either Saudi Arabia or central India. These independent events occurred between 3,000 and 6,000 generations ago, approximately 70-150,000 years.
22597
People with sickle cell disease produce unusually shaped red blood cells that can cause problems because they do not live as long as healthy blood cells and can block blood vessels. Sickle cell disease is a serious and lifelong health condition, although treatment can help manage many of the symptoms.
566077
Sickle cell anemia is caused when a baby gets one sickle cell gene change from each parent. Hemoglobin SC. This condition is caused when a baby gets one sickle cell gene change from one parent and one gene change for hemoglobin C (another abnormal type of hemoglobin) from the other parent.
627003
Periodic episodes of pain, called pain crises, are a major symptom of sickle cell anemia. Pain develops when sickle-shaped red blood cells block blood flow through tiny blood vessels to your chest, abdomen and joints. Pain can also occur in your bones.
1171558
Sickle cell anemia is inherited in an autosomal recessive pattern, which means that both copies of the gene in each cell have mutations .
521635
Sickle cells break apart or die more easily than normal red blood cells, causing severe anemia. Severe means that problems can happen more often and be more serious.
882946
A genetic disease Sickle cell anemia results from a mutation in a gene called HBB, which contains the blueprint for cells to make part of a protein called hemoglobin. The hemoglobin protein is made up of two alpha chains and two beta chains. Each chain includes an iron-containing “heme” portion.
1143951
The sickle cell anemia trait is found on a recessive allele of the hemoglobin gene. This means that you must have two copies of the recessive allele — one from your mother and one from your father — to have the condition.
289687
Sickle Cell disease is an autosomal recessive disorder that causes anemia, joint pain, a swollen spleen, and frequent, severe infections. It illustrates balanced polymorphism because carriers are resistant to malaria, an infection by the parasite Plasmodium falciparum that causes cycles of chills and fever.
399911
Sickle cell anemia is an inherited red blood cell disorder in which there aren't enough healthy red blood cells to carry oxygen throughout your body. Normally, the flexible, round red blood cells move easily through blood vessels. In sickle cell anemia, the red blood are shaped like sickles or crescent moons.
348966
Sickle cell disease (SCD) is a blood disorder that a child is born with. It's passed down through a parent's genes. Children with SCD make an abnormal type of hemoglobin. This is the protein in red blood cells that carries oxygen to all parts of the body. With SCD, the body organs and tissues don't get enough oxygen.
919228
Having sickle cell disease means a lifelong battle against the health problems it can cause, such as pain, infections, anemia, and stroke. But many people are able to have a very good quality of life by learning to manage the disease.
1373942
Sickle cell anemia is one of a group of diseases termed hemoglobinopathies, in which hemoglobin A is partly or completely replaced by abnormal sickle hemoglobin S. It is caused by the inheritance of a gene for a structurally abnormal portion of the hemoglobin chain.
60968
While beta thalassemia is caused by a defect in the beta-globin gene, controlling the production of the beta-globin chains of hemoglobin, sickle cell disease is caused by a defect in hemoglobin itself with the presence of abnormal hemoglobin S.
617799
Sickle cell anaemia is an inherited autosomal recessive disorder. The leading causes of death in sickle cell diseases (SCD) are infection, pain episodes, acute chest syndrome and stroke [1, 2]. Death can be sudden and unexpected in sickle cell anaemia [1].
550968
Selection for Malaria Resistance: A Closer Look Indeed, the sickle-cell variant (i.e., the HbS allele) has been identified in four distinct genetic backgrounds in different African populations, suggesting that the same mutation arose independently several times through convergent evolution.
1106121
Acute painful sickle cell episodes (also known as painful crises) are caused by blockage of the small blood vessels. The red blood cells in people with sickle cell disease behave differently under a variety of conditions, including dehydration, low oxygen levels and elevated temperature.