TCF7L2 (Transcription Factor 7-Like 2): TCF7L2 is a key regulator in the Wnt signalling pathway, which plays an important role in cell growth and development. Variants in this gene have been strongly linked to an increased risk of type 2 diabetes, likely through their impact on insulin secretion and glucose metabolism. Understanding TCF7L2 is essential for uncovering the genetic basis of diabetes and advancing potential treatments.