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How do therapeutic proteins help people with genetic deficiencies?

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A step-by-step diagram shows donor DNA and vector DNA cut with restriction enzymes to create overhangs, mixed and sealed with ligase to form recombinant DNA, which is introduced into bacterial cells. The recombinant DNA replicates as the cells divide, producing clones. — biotechnology Steps involved in the engineering of a recombinant DNA molecule.

Therapeutic proteins play a vital role in managing genetic deficiencies by augmenting the body’s own supplies or compensating for missing or defective proteins. Through recombinant DNA technology, scientists can insert human genes into production cells—such as bacteria, yeast, or mammalian cells—to manufacture these proteins in large, safe, and consistent quantities.12

These proteins help patients in several ways:

Replacement Therapy: For individuals whose bodies cannot produce a specific protein due to a genetic mutation, therapeutic proteins act as a direct replacement. Examples include insulin for diabetes, blood-clotting factors for hemophilia, and enzymes used to treat conditions like Gaucher syndrome.23
Augmentation: In cases where the body produces insufficient amounts of a necessary substance, such as growth hormone, these manufactured proteins supplement the body's natural levels to restore normal function.21

By providing these essential molecules, biotechnology allows for the treatment of conditions that were previously difficult to manage, offering a precise medical intervention at the molecular level.1