← Genes & pathways

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

IL23A

IL23A encodes the p19 subunit of interleukin-23. Together with the p40 subunit encoded by IL12B, it forms a cytokine involved in supporting Th17 responses.

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

Updated Sep 23, 2026 · Educational reference

THE TEACHING CONNECTION

The p19 component of IL-23

The p19 component of IL-23

IL23A encodes the p19 subunit of interleukin-23. Together with the p40 subunit encoded by IL12B, it forms a cytokine involved in supporting Th17 responses.

Putting the pieces together

Dr. Purser discusses IL23A in colitis and psoriasis-related teaching. Linking IL23A to IL23R and IL17A makes the sequence easier to follow: produce the cytokine, receive its signal and maintain a downstream inflammatory response. Genetic associations do not identify the correct immune treatment by themselves.

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

Which established clinical findings make the IL-23/IL-17 connection relevant?

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-23A · Interleukin 23A