rs1801133(G;G)

Common genotype: normal homocysteine levels

Magnitude
0.0Typical
Repute
Good
Frequency
57%Average of 11 populations
On SNPedia
rs1801133(C;C)Minus strand
Gene
MTHFR

Frequency

Share of people with G;G in each HapMap population.

  • Maasai (Kenya)84%
  • Luhya (Kenya)83%
  • African ancestry (Southwest US)83%
  • Yoruba (Nigeria)82%
  • Gujarati Indian69%
  • European ancestry (Utah)47%
  • Chinese (Denver)46%
  • Japanese (Tokyo)37%
  • Mexican ancestry (Los Angeles)35%
  • Tuscan32%
  • Han Chinese (Beijing)28%

Other genotypes of rs1801133

  1. A;GBad1 copy of C677T allele of MTHFR = 65% efficiency in processing folic acidWorth knowing · 2.233% of people
  2. A;AMost notableBadhomozygous for C677T of MTHFR = 10-20% efficiency in processing folic acid = high homocysteine, low B12 and folate levelsWorth knowing · 2.810% of people

All about rs1801133

Source and license

Adapted from rs1801133(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 Its entries can be incomplete, out of date or wrong, and nothing here is a diagnosis or medical advice.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.