rs121908635(C;T)

Morning Lark (people waking up very early)

Magnitude
4.0Very important
Repute
Not rated
On SNPedia
rs121908635(A;G)Minus strand
Gene
PER2

Other genotypes of rs121908635

  1. T;TGoodcommon in clinvarTypical · 0.0

All about rs121908635

Notes

From SNPedia

This variant is associated with people who have a sleep disorder known as Familial Advanced Sleep Phase sydrome (FASPS). This is associated with a 4-hour advance of their sleep, temperature, and melatonin rhythms, including going to bed and waking up that much earlier on average.

Source and license

Adapted from rs121908635(A;G) 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 Its entries can be incomplete, out of date or wrong, and nothing here is a diagnosis or medical advice.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.