← Genes & pathways

Gene & pathway reference · FROM DR. PURSER’S TEACHING

IL17A

IL17A encodes interleukin-17A, a cytokine involved in defense at tissue barriers and inflammatory signaling. It belongs to the Th17 pathway, which is supported by signals including IL-23.

Based on teaching by Dan Purser, MD. How we prepare these guides

Updated Sep 23, 2026 · Educational reference

THE TEACHING CONNECTION

Th17 signaling and persistent inflammation

Th17 signaling and persistent inflammation

IL17A encodes interleukin-17A, a cytokine involved in defense at tissue barriers and inflammatory signaling. It belongs to the Th17 pathway, which is supported by signals including IL-23.

Putting the pieces together

Dr. Purser discusses this pathway in chronic inflammatory settings, including his sickle-cell teaching. IL17A, IL23A and IL23R represent different parts of the same network: a downstream signal, an upstream cytokine component and a receptor. Their variants do not diagnose an inflammatory disease or select an immune-targeting drug.

Where the VARS Triad and MTHFR Daily fit

If you are exploring homocysteine or cytokines, Dr. Purser may discuss MTHFR Daily and the VARS Triad: VARS Glutathione, VARS SOD, and VARS Catalase. He gives glutathione a central place in his approach to antioxidant support.

A gene result alone cannot tell you that you need these products or that they will treat a condition. Review your current results, medicines, goals, and tolerance with your clinician before choosing a product or dose.

A question to bring to your visit

What diagnosed condition or clinical finding makes the IL-23/Th17 pathway relevant here?

Variant lookup

These names can help you find an entry on your original genetic report. Seeing a name here does not tell you whether it affects your health or whether you need treatment.

Names you may see

IL-17A · Interleukin 17A