The Klotho gene (KL) provides the genetic instructions for producing the Klotho protein. It is primarily expressed in the kidneys and the brain, though its influence extends throughout the body via circulating Klotho.

The gene derives its name from Klotho, one of the three Fates in Greek mythology, who was responsible for spinning the thread of life, a symbolic reflection of its role in lifespan regulation.

When the Klotho gene is actively expressed, cells produce adequate levels of Klotho protein to support:

• Cellular stress resistance
• Balanced mineral and phosphate metabolism
• Healthy signaling between organs
• Protection against age-related cellular damage

Conversely, reduced expression of the Klotho gene leads to lower Klotho protein levels, impairing these protective mechanisms.

Importantly, Klotho gene expression is not static. It is influenced by genetic factors, biological aging, environmental stressors, and physiological conditions, making it a key focus of modern longevity and aging research.