rs2090409

A SNP on chromosome 9. Its most notable genotype is C;C: age at menarche ~2 months later on average

Gene
None listed
Location
Chr 9106,204,807 (GRCh38)
Highest magnitude
0.0Typical
Tested on
23andMe, AncestryDNA
Minor allele frequency
37%

Genotypes

Plus strand, as in 23andMe and AncestryDNA files.

  1. C;CMost notableNot ratedage at menarche ~2 months later on averageTypical · 0.042% of people
  2. A;CNot ratedage at menarche ~1 month later on averageTypical · 0.044% of people
  3. A;ANot ratednormalTypical · 0.014% of people

SNPedia records rs2090409 on the minus strand: (G;G), (G;T), (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 42% A;C 44% A;A 14%
  • European ancestry (Utah)C;C 47% A;C 44% A;A 9%
  • Han Chinese (Beijing)C;C 27% A;C 48% A;A 25%
  • Japanese (Tokyo)C;C 29% A;C 50% A;A 20%
  • Yoruba (Nigeria)C;C 46% A;C 37% A;A 16%
  • African ancestry (Southwest US)C;C 30% A;C 63% A;A 7%
  • Chinese (Denver)C;C 35% A;C 47% A;A 18%
  • Gujarati IndianC;C 69% A;C 29% A;A 2%
  • Luhya (Kenya)C;C 41% A;C 38% A;A 21%
  • Mexican ancestry (Los Angeles)C;C 43% A;C 43% A;A 14%
  • Maasai (Kenya)C;C 45% A;C 41% A;A 14%
  • TuscanC;C 47% A;C 44% A;A 9%

Notes

From SNPedia

Notes

rs2090409 is a SNP from chromosomal region 9q31.2 showing the strongest association with age at menarche in a study of 17,500 Icelandic women. Per copy carried of the rs2090409(A) allele, age at menarche is delayed about 1 month.

Source and license

Adapted from rs2090409 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 Its entries can be incomplete, out of date or wrong, and nothing here is a diagnosis or medical advice.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.