Slide 1
Altered haemoglobin changes red-cell shape and flexibility
Sickle cell disease involves inherited changes in hemoglobin, the oxygen-carrying protein in red cells. The altered protein can affect cell shape and flexibility.
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Hemoglobin S can form strands under particular conditions. This molecular change helps explain how a genetic difference can become a mechanical problem in tiny blood vessels.
Slide 2
Rigid cells can obstruct narrow vessels
Healthy red cells deform as they pass through small vessels. Rigid sickled cells can obstruct flow and reduce oxygen delivery to tissues.
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A blockage can cause pain and injury even though the original change is inside a blood cell. Disease effects therefore extend beyond the place where the altered protein is made.
Slide 3
Faster breakdown can outpace replacement
Sickled red cells break down sooner than normal red cells. If replacement cannot keep pace, the circulating red-cell supply falls.
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This shortage is anemia, a different mechanism from vessel obstruction. Both can impair oxygen delivery, so the disease cannot be explained by cell shape alone.
Slide 4
Sickle cell trait is not the same genetic pattern as disease
Sickle cell trait usually means one hemoglobin S gene and one usual hemoglobin gene. It is not the same genetic pattern as sickle cell disease.
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Disease can involve two hemoglobin S copies or a combination with another relevant hemoglobin variant. Inheritance therefore has several forms rather than one single pair of identical changes.
Slide 5
Effects and severity differ among people
Repeated circulation problems can affect several organs. The pattern and severity vary among people with sickle cell disease.
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The spleen can be damaged, which changes protection against certain infections. This adds an immune consequence to a condition that begins with the physical properties of red blood cells.