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Sickle cell disease is part of a group of inherited disorders (notably sickle cell anemia) that affect the structure of red blood cells, the body’s oxygen carriers.
Red blood cells, generally round and supple, navigate effortlessly through our blood vessels.
However, in sickle cell anemia, some of these cells assume the shape of sickles or crescent moons, turning rigid and sticky. This transformation can hamper or block blood flow, leading to numerous health issues.
While there’s currently no universal cure, treatments can alleviate pain and help prevent disease-associated complications, improving the quality of life for those affected.
The Inheritance Pattern of Sickle Cell Disease
Sickle cell disease is an inherited condition that springs from the inheritance of two abnormal hemoglobin genes, referred to as hemoglobin S, one from each parent.
When a person inherits the hemoglobin S gene from only one parent and a normal hemoglobin gene (hemoglobin A) from the other, they have what’s known as sickle cell trait. These individuals are generally healthy but are carriers of the disease.
Let’s break this down:
If both parents have one normal hemoglobin A gene and one hemoglobin S gene, each of their offspring has:
- a 25% chance of inheriting two normal hemoglobin A genes (not having sickle cell trait or disease),
- a 50% chance of inheriting one normal hemoglobin A gene and one hemoglobin S gene (having sickle cell trait), and
- a 25% chance of inheriting two hemoglobin S genes (developing sickle cell disease).
These odds remain the same for each child the couple conceives, irrespective of the genetic outcome of their previous children.
Signs and Symptoms of Sickle Cell Disease
The symptoms of sickle cell disease usually begin to surface around the age of six months. These symptoms, varying in intensity and frequency, can change over time. They can include:
- Anemia
- Painful Episodes
- Swelling of Hands and Feet
- Frequent Infections
- Delayed Growth or Puberty
- Vision Problems
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