{{Rsnum
|rsid=7221412
|Gene=TRNAS6
|Chromosome=17
|position=8137696
|Orientation=plus
|GMAF=0.3324
|Assembly=GRCh38
|GenomeBuild=38.1
|dbSNPBuild=141
|geno1=(A;A)
|geno2=(A;G)
|geno3=(G;G)
}}{{ population diversity
| geno1=(A;A)
| geno2=(A;G)
| geno3=(G;G)
| CEU | 28.3 | 49.6 | 22.1
| HCB | 74.5 | 24.8 | 0.7
| JPT | 71.7 | 28.3 | 0.0
| YRI | 43.5 | 38.1 | 18.4
| ASW | 33.3 | 50.9 | 15.8
| CHB | 74.5 | 24.8 | 0.7
| CHD | 79.8 | 20.2 | 0.0
| GIH | 64.4 | 29.7 | 5.9
| LWK | 33.6 | 48.2 | 18.2
| MEX | 50.0 | 39.7 | 10.3
| MKK | 27.7 | 49.0 | 23.2
| TSI | 36.3 | 49.0 | 14.7
| HapMapRevision=28
}}{{PMID|23034908|OA=1
}}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]] is not presently covered by 23andMe, but this SNP appears to sit in a haplotype block and is flanked by [[rs9914077]] and [[rs2585408]]

{{on chip | FTDNA}}
{{on chip | Illumina Human 1M}}