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Red blood cell count

ZNRF3 · rs75256343

Where this position leads

Strength of the evidence

1 / 4

Its strongest genetic-study result is p = 10⁻¹⁴, with 2 associations in the GWAS Catalog.

How this is scored

4: ClinVar disease-causing, reviewed by an expert panel or a guideline (3–4 stars). 3: ClinVar, several labs agreeing (2 stars), or a genetic study at p ≤ 10⁻⁵⁰. 2: ClinVar from one lab (1 star), or p ≤ 10⁻²⁰. 1: ClinVar submitted without criteria (0 stars), or genome-wide significance (p ≤ 5×10⁻⁸). The higher of the two counts. It says how solid the evidence is, not whether it matters for a particular person.

What the study found

Who was studied 507,850 East Asian ancestry individuals, 420,829 European ancestry individuals.

The effect Each copy of the T allele shifted the measure 0.0275 higher (95% confidence interval 0.021-0.034); p = 9 × 10⁻¹⁵.

Where it sits Chromosome 22, band 22q12.1 — in an intron of ZNRF3.

How common each version is

CT

Korean KRGDB

C 75.0% · T 25.0%

Korean Korea4K

C 96.5% · T 3.5%

Japanese ToMMo

C 97.1% · T 2.9%

Vietnamese

C 97.2% · T 2.8%

World gnomAD

C 96.8% · T 3.2%

World 1000 Genomes

C 96.5% · T 3.5%

World TOPMed

C 97.1% · T 2.9%

The share of all copies of this position that are each version. Source: the population studies published in dbSNP (US NCBI); each row names its study.

What each result means

C/C No copy of the version the research linked to Red blood cell count. This is the starting point the study compared everyone against.

C/T One copy of the version the research linked to Red blood cell count. That is a smaller link than two copies.

T/T Two 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.

Source

Genome-wide association studies in a large Korean cohort identify quantitative trait loci for 36 traits and illuminate their genetic architectures

Jee YH, Wang Y, Jung KJ, Lee JY, Kimm H, Duan R, Price AL, Martin AR, Kraft P

Nature communications · 2025 · PMID 40436827 · open access

Questions about rs75256343

What is rs75256343?

rs75256343 is a single position in the genome, in or near the ZNRF3 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 rs75256343 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 rs75256343 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 rs75256343 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.

Quoting this page

Licensed CC BY-NC 4.0: free to read, share and adapt for non-commercial use, naming MyGeneLog™ and linking the exact page. Commercial use, including training or serving a commercial AI system, needs a licence — https://www.mygenelog.com/license

Red blood cell count (rs75256343). MyGeneLog™. https://www.mygenelog.com/variants/rs75256343

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