rs121907954(G;G)

If from Ancestry, this is a miscall and you are normal for this SNP; if from another company, please contact us.

Magnitude
2.0Worth knowing
Repute
Bad
On SNPedia
rs121907954(C;C)Minus strand
Gene
HEXA

Other genotypes of rs121907954

  1. T;TMost notableBadTay-Sachs disease (predicted)Very important · 8.8
  2. C;TBadCarrier for a Tay-Sachs mutationImportant · 3.0
  3. C;GBadCarrier of a Tay-Sachs mutationImportant · 3.0
  4. C;CGoodcommon in clinvarTypical · 0.0

All about rs121907954

Notes

From SNPedia

This genotype should be extremely rare, representing a Tay-Sachs disease genotype (with two copies of an extremely rare mutation), but it is very commonly reported incorrectly in Ancestry raw data files and is therefore almost 100% certain to be a miscall if seen in your report (and, in reality, you have the completely common, normal genotype for this SNP).

Source and license

Adapted from rs121907954(C;C) 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 Its entries can be incomplete, out of date or wrong, and nothing here is a diagnosis or medical advice.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.