This disease causes decreased oxygen levels in people who have it. Inheriting sickle cell anemia is a key factor in its survival, with only those homozygous for this mutation unlucky enough to catch it. When it comes to the impact of sickle cell disease on individuals, hemoglobin is the molecule that plays the most important role, as its function is greatly hampered. Fortunately, there are methods being developed to get rid of this disease once and for all.