rs1128503(A;A)

Likely to require more methadone during heroin withdrawal

Magnitude
0.0Typical
Repute
Bad
Frequency
20%Average of 11 populations
On SNPedia
rs1128503(T;T)Minus strand
Gene
ABCB1

Frequency

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

  • Han Chinese (Beijing)51%
  • Chinese (Denver)46%
  • Japanese (Tokyo)35%
  • Gujarati Indian32%
  • Tuscan21%
  • Mexican ancestry (Los Angeles)17%
  • European ancestry (Utah)17%
  • Maasai (Kenya)3%
  • African ancestry (Southwest US)2%
  • Luhya (Kenya)<1%
  • Yoruba (Nigeria)<1%

Other genotypes of rs1128503

  1. G;GMost notableNot ratednormalTypical · 0.039% of people
  2. A;GBadmay require more methadone during heroin withdrawalTypical · 0.041% of people

All about rs1128503

Source and license

Adapted from rs1128503(T;T) 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 Its entries can be incomplete, out of date or wrong, and nothing here is a diagnosis or medical advice.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.