TCF7L2: Type 2 Diabetes Risk

rs7903146 · Metabolic Health & Diabetes

TCF7L2 rs7903146 is the strongest common genetic risk factor for type 2 diabetes, affecting insulin secretion and glucose metabolism.

What This SNP Does

TCF7L2 (transcription factor 7-like 2) is a key component of the Wnt signaling pathway that regulates beta cell function in the pancreas. The T allele reduces insulin secretion capacity and increases type 2 diabetes risk by 1.4x per copy. This is the most replicated and strongest single-gene association with type 2 diabetes across all studied populations.

Genotype Meanings

Genotype	Status	What It Means
CC	Lower risk	Normal insulin secretion. Population-average diabetes risk.
CT	Moderate risk	~1.4x increased risk. Reduced beta cell function. Responds well to lifestyle intervention.
TT	Higher risk	~2x increased risk. Significantly reduced insulin secretion capacity.

What You Can Do

T allele carriers should prioritize glycemic control through diet (low glycemic load, adequate fiber), regular exercise (which independently improves insulin sensitivity), and maintaining healthy weight. Regular fasting glucose and HbA1c monitoring is recommended.

This information is for educational purposes only and is not medical advice. Always consult a qualified healthcare provider before making health decisions based on genetic data. Genome Decoder does not diagnose, treat, or prevent any disease.