XDH and hyperuricemia: Deepening our understanding of UOXs and other genes (e.g., XDH, Transporters, etc.)from tea field microbes involved in caffeine metabolism pathway are important for (i) the development of nutritional, low-purine foods suitable for patients with hyperuricemia and gout and (ii) for the reduction of caffeine-related contamination of soil and the surrounding environment in the future.