rs7221412
PER2rs7221412 is a single-nucleotide polymorphism (SNP) in the PER2 gene. Genespiral reads it in the Sleep analysis to describe Chronotype (Morning/Night).
- Gene
- PER2
- Alleles
- A / G
- Genotypes
- GG, GA, AA
- Traits
- 1 trait across 1 analysis
An rsID such as rs7221412 is the reference number dbSNP assigns to one position in the genome where people commonly differ by a single letter. Raw data exports from 23andMe and AncestryDNA list your two alleles at that position as a genotype - for this marker one of GG, GA, AA. The order of the two letters carries no meaning, so GA and its reverse are the same genotype.
Alleles on this page are written on the forward (plus) strand, matching how consumer raw files report them. Other references sometimes describe the same variant on the opposite strand, which swaps A↔T and C↔G - see why the same variant can look different. The associations below are educational summaries of published research; they are not diagnoses, and the effect of any single SNP is usually modest.
Chronotype (Morning/Night)
Sleep Traits · Part of the Sleep analysis
Involved in regulating circadian rhythms, influencing morning or night preferences.
| Genotype | Association |
|---|---|
| GG | Morning Person |
| GA | Morning Person |
| AA | Night Owl |
- Summary
- PER2 gene variations contribute to whether someone is a morning or evening person.
- Scientific insights
- 'AA' genotype is linked to a preference for staying up later, while 'GG' correlates with early rising.
- Lifestyle tips
- Light exposure can help adjust circadian rhythms to desired sleep patterns.
Check your genotype at rs7221412
Load your raw DNA file and Genespiral looks up rs7221412 along with every other marker in the Sleep analysis. The file is parsed in your browser and never uploaded, so your genotype stays on your device.
- 1. Download your raw data from 23andMe or AncestryDNA.
- 2. Open the analysis below and choose the file.
- 3. Find Chronotype (Morning/Night) in your results.
Related
References
Primary databases for this variant. Use them to check allele orientation, population frequencies, and the underlying studies.
- dbSNP entry for rs7221412 - NCBI
- rs7221412 variant page - Ensembl
- rs7221412 summary - SNPedia
- Clinical significance records for rs7221412 - ClinVar
- PER2 gene - NCBI Gene
Genespiral is an educational tool, not a medical service. Genetic associations describe tendencies observed across populations, not certainties for you. Read the full disclaimer.