Term Paper on "Sickle Cell"

Term Paper 4 pages (1267 words) Sources: 1+

[EXCERPT] . . . .

Sickle cell anemia is an inherited blood disorder in which hemoglobin is defective (Genetic disease profile: Sickle cell anemia). After hemoglobin molecules give up their oxygen, some cluster together and form long, rod-like structures. These structures cause red blood cells to become stiff and assume a sickle shape that makes it difficult for them to squeeze through small blood vessels. As a result, they stack up and cause blockages that deprive organs and tissues of oxygen-carrying blood.

Sickle cell anemia affects millions world wide (Genetic disease profile: Sickle cell anemia). It is the most common among people whose ancestors come from sub-Saharan Africa; Spanish-speaking regions (South America, Cuba, Central America); Saudi Arabia; India; and Mediterranean countries such as Turkey, Greece, and Italy. In the Unites States, it affects around 72,000 people, most of whose ancestors come from Africa. The disease occurs in about one in every 500 African-American births and one in every 1000 to 1400 Hispanic-American births. About two million Americans, or one in twelve African-Americans, carry the sickle cell trait.

Genotypic Expressions

People have twenty-two identical chromosome pairs with one of each pair inherited from the father, and one from the mother (How does sickle cell cause disease?, 2002). Mutation involving gene alteration in the exchange between a parent and child occurs only rarely. Most likely, sickle cell disease depends on inherited genes from parents' the disease cannot be caught, acquired or otherwise transmitted. The disease is caused by a change in a single amino acid difference in the beta chain of hemoglobin. (Malaria, sickle cell anemia, and balancing selection).

Individuals with two copies of the sickle form of the gene have sickle cell anemia (Malaria, sickle cell anemia and balancing selection). Heterozygotes -- individuals with one normal and one mutant copy of the sickle gene -- appear normal and do not manifest the disease except under very stressful conditions. However, these individuals are carriers of the sickle cell trait. Approximately ten percent of African-Americans are carriers. In Africa and India, the frequencies of the disease and carriers are even higher de to protection against malaria that occurred for people with sickle cell trait discussed later in this paper.

Beta globin is a major component of adult hemoglobin and its gene is located on chromosome 11 with more than 475 allelic variants (Ashley-Koch, Yang, and Olney, 2000). One of these variants, sickle hemoglobin (Hb S), is responsible for sickle cell disease. The most influential risk factor for disease severity is genotype (Sickle cell anemia - description). Individuals who are homozygous for the sickle beta globin gene (b S) have sickle cell anemia (SS disease). Individuals with sickle beta thalassemia have a b S. gene and a gene for beta thalassemia. If no beta globin is produced by the beta thalassemia gene, the individual has Sb o thalassemia (Sb o thal). If some normal beta globin is produced by the thalassemia gene, the individual has Sb + thalassemia (Sb + thal). In the case of hemoglobin (SC disease), the individual has two abnormal beta globin genes, b S. And b C, and makes two abnormal hemoglobins, Hb S. And Hb C.

Phenotypic Expressions

There are several phenotypes associated with the homozygous sickle genotype (Hemoglobinopathies, 1998). Sickle cell anemia refers to a recessive gene condition in which a person has inherited two genes for hemoglobin S, one from each parent. If two parents who are carriers have a child, there is a one-in-four chance of their child developing the illness and a one-in-two chance of their child just being a carrier. (Sickle cell anemia, Wikipedia). Children who receive one abnormal gene and one normal gene usually have no symptoms and are said to have sickle cell trait. The next two phenotypes, blood cell sickling and altered beta-globin electrophoretic mobility involve partially dominant genes… READ MORE

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