{{Rsnum
|rsid=3814570
|Gene=TCF7L2
|Chromosome=10
|position=114708510
|Orientation=plus
|GMAF=0.1818
|Assembly=GRCh37
|GenomeBuild=37.1
|dbSNPBuild=131
|geno1=(C;C)
|geno2=(C;T)
|geno3=(T;T)
}}
{{ population diversity
| geno1=(C;C)
| geno2=(C;T)
| geno3=(T;T)
| CEU | 53.1 | 42.5 | 4.4
| HCB | 85.4 | 13.1 | 1.5
| JPT | 91.2 | 8.8 | 0.0
| YRI | 81.0 | 19.0 | 0.0
| ASW | 86.0 | 12.3 | 1.8
| CHB | 85.4 | 13.1 | 1.5
| CHD | 85.3 | 14.7 | 0.0
| GIH | 57.4 | 39.6 | 3.0
| LWK | 85.5 | 14.5 | 0.0
| MEX | 58.6 | 34.5 | 6.9
| MKK | 84.0 | 14.7 | 1.3
| TSI | 40.2 | 46.1 | 13.7
| HapMapRevision=28
}}[[rs3814570]] is a SNP in the transcription factor 7-like 2 (T-cell specific, HMG-box) [[TCF7L2]] gene.

A study of 784 [[Crohn's disease]] patients with ileal involvement concluded that [[rs3814570]] was associated with increased risk, but not with risk for colonic Crohn's disease or ulcerative colitis. The odds ratio was 1.27 (CI: 1.07 - 1.52, p = 0.00737).{{PMID|19221600|OA=1
}}

{{PMID|19351735|OA=1
}} Evidence for association between polycystic ovary syndrome (PCOS) and TCF7L2 and glucose intolerance in women with PCOS and TCF7L2.

{{on chip | 23andMe v3}}
{{on chip | 23andMe v4}}
{{on chip | FTDNA2}}
{{on chip | HumanOmni1Quad}}
{{on chip | Illumina Human 1M}}
{{on chip | NatGeo2}}