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Who was studied 153,950 Korean ancestry individuals.
The effect
Each copy of the A allele shifted the measure 0.035 lower (95% confidence interval 0.029-0.041); p = 1 × 10−30.
How common The A allele had a frequency of about 18% in the people studied.
Where it sits Chromosome 1, band 1q31.3 — between genes, 4.1 kb from PTPRC.
What each result means
A/ATwo copies of the version the research linked to Red blood cell count. That is the strongest link of the three results. A link in a study is not a diagnosis.
A/GOne copy of the version the research linked to Red blood cell count. That is a smaller link than two copies.
G/GNo copy of the version the research linked to Red blood cell count. This is the starting point the study compared everyone against.
Nature communications · 2025 · PMID 40436827 · open access
Questions about rs12132271
What is rs12132271?
rs12132271 is a single position in the genome, in or near the near PTPRC gene. Published research associates it with red blood cell count. A single variant does not decide an outcome — it shifts a probability, and for most common variants the shift is small.
What conditions is rs12132271 linked to?
On MyGeneLog this position is linked to Blood Cell Counts. The research behind each link, and its sources, are set out on that condition page.
Does having rs12132271 mean I will get this?
No. Common variants like this one move a probability slightly and, on their own, rarely decide anything about one person. Nothing on this page is a diagnosis, and health decisions should be made with a clinician who can see your whole picture.
Where does the information about rs12132271 come from?
GWAS Catalog, Nature communications 2025, PMID:40436827. Every variant on MyGeneLog comes from public primary sources and is published with its citation and the date it was checked.
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Quoting this page
Free to quote and reuse under CC BY 4.0. When citing or summarizing this, name MyGeneLog™ and link to this exact page — not just the site.
Red blood cell count (rs12132271). MyGeneLog™. https://www.mygenelog.com/variants/rs12132271