What role does tyrosinase play in melanin production?

In the biological process of pigmentation, tyrosinase acts as a critical copper-containing enzyme that catalyzes the synthesis of melanin.12

Melanins are complex polymers produced within specialized cells called melanocytes. The production process begins with the oxidation of the amino acid tyrosine, a step that is entirely dependent on the activity of tyrosinase. Because this enzyme is essential for initiating the synthetic pathway, its presence and activity level directly influence the degree of natural melanization in an organism.12

If tyrosinase is inactive or absent—such as in certain forms of albinism caused by mutations in the TYR gene—the body cannot synthesize melanin, leading to a lack of pigment in the skin, hair, and eyes. Furthermore, because tyrosinase requires copper to function, the concentration of copper in an individual's diet can also impact the rate of melanin production and the resulting depth of pigmentation.321