rs13265557

A SNP in the CNGB3 gene on chromosome 8. Its most notable genotype is C;C: rare variation in a gene influencing color perception

Gene
CNGB3
Location
Chr 886,647,872 (GRCh38)
Highest magnitude
0.1Typical
Tested on
23andMe, FamilyTreeDNA
Minor allele frequency
6%

Genotypes

As shown in 23andMe and AncestryDNA files.

  1. C;CMost notableNot ratedrare variation in a gene influencing color perceptionTypical · 0.1<1% of people
  2. T;TGoodcommon in complete genomicsTypical · 0.089% of people

On SNPedia: (C;C), (T;T). Magnitude rates how notable a genotype is from 0 to 10, not how risky it is.

Frequency

Share of each genotype in 11 HapMap populations.

  • AverageC;C <1% T;T 89%
  • European ancestry (Utah)C;C <1% T;T 85%
  • Han Chinese (Beijing)C;C 0% T;T 94%
  • Japanese (Tokyo)C;C 0% T;T 81%
  • Yoruba (Nigeria)C;C 0% T;T 91%
  • African ancestry (Southwest US)C;C 0% T;T 93%
  • Chinese (Denver)C;C <1% T;T 96%
  • Gujarati IndianC;C 3% T;T 80%
  • Luhya (Kenya)C;C 0% T;T 89%
  • Mexican ancestry (Los Angeles)C;C 0% T;T 95%
  • Maasai (Kenya)C;C 0% T;T 88%
  • TuscanC;C 0% T;T 87%

Conditions, medicines and genes

Other CNGB3 SNPs

All CNGB3 SNPs

Notes

From SNPedia

Notes

C;C

You have a rare genotype in a gene linked to colorblindness, however self reports by others with this genotype do not find any evidence of altered color perception. Consider taking some of these *http://www.color-blindness.com/2007/10/07/5-online-color-blindness-tests/ Three individuals with this genotype have emailed to confirm that they are not colorblind. However, one woman reports being red-green colorblind, as diagnosed by a physician. It is however possible her color blindness is unrelated to this SNP.

Source and license

Adapted from rs13265557 on SNPedia, using a snapshot taken October 16, 2026. SNPedia content is shared under CC BY-NC-SA 3.0 US, and this page is shared under the same license.

SNPedia is a community-edited wiki. Its entries can be incomplete, out of date or wrong, and nothing here is a diagnosis or medical advice. Magnitude is a community rating of how interesting a genotype is, not a risk score.