Adenosine deaminase

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Adenosine deaminase (ADA) is an enzyme involved in purine metabolism. It is crucial for the breakdown of adenosine from food and for the turnover of nucleic acids in tissues. ADA is essential for the proper functioning of the immune system.

Function

Adenosine deaminase catalyzes the deamination of adenosine, converting it into inosine by removing an amino group. This reaction is a key step in the purine salvage pathway, which recycles purines to synthesize nucleotides.

Clinical Significance

Deficiency in ADA can lead to severe combined immunodeficiency (SCID), a condition characterized by a severely compromised immune system. This deficiency is often referred to as ADA-SCID. Patients with ADA-SCID are highly susceptible to infections due to the lack of functional T cells and B cells.

ADA deficiency can be diagnosed through genetic testing and measuring enzyme activity in the blood. Treatment options include enzyme replacement therapy, gene therapy, and hematopoietic stem cell transplantation.

Genetic Information

The ADA gene is located on chromosome 20 in humans. Mutations in this gene can lead to ADA deficiency. The gene is expressed in various tissues, with high levels in the thymus and other lymphoid tissues.

Research and Development

Research on ADA has led to significant advancements in understanding the immune system and developing treatments for immunodeficiency disorders. Gene therapy for ADA-SCID has shown promising results, offering potential long-term solutions for patients.

See Also

• Purine metabolism
• Severe combined immunodeficiency
• Gene therapy
• Enzyme replacement therapy

External Links

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