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