||Early riser. Wakes up 1 hour earlier than those with GG genotype.
||Intermediate riser. Wakes up at a time between the AA and GG genotypes.
||Late riser. Wakes up 1 hour later than those with AA genotype.
[PMID 23034908]A common polymorphism near PER1 and the timing of human behavioral rhythms. Study showed that it had influence on wake-up times, as well as time of day that death occurs. Suggests that common (but unidentified) polymorphisms may be associated with a preference for daytime or nighttime activity.
rs7221412 appears to sit in a haplotype block and is flanked by rs9914077 and rs2585408