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Who was studied 47,745 European ancestry individuals.
The effect
Each copy of the T allele shifted the measure 0.0865 higher (95% confidence interval 0.068-0.105); p = 2 × 10−23.
How common The T allele had a frequency of about 12% in the people studied.
Where it sits Chromosome 6, band 6p21.33 — in an intron of C2.
What each result means
C/CNo copy of the version the research linked to C3 protein levels. This is the starting point the study compared everyone against.
C/TOne copy of the version the research linked to C3 protein levels. That is a smaller link than two copies.
T/TTwo copies of the version the research linked to C3 protein levels. That is the strongest link of the three results. A link in a study is not a diagnosis.
Nature genetics · 2025 · PMID 39789286 · open access
Questions about rs556679
What is rs556679?
rs556679 is a single position in the genome, in or near the C2 gene. Published research associates it with c3 protein levels. A single variant does not decide an outcome — it shifts a probability, and for most common variants the shift is small.
What conditions is rs556679 linked to?
On MyGeneLog this position is linked to Celiac Disease. The research behind each link, and its sources, are set out on that condition page.
Does having rs556679 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 rs556679 come from?
GWAS Catalog, Nature genetics 2025, PMID:39789286. Every variant on MyGeneLog comes from public primary sources and is published with its citation and the date it was checked.
0 142318Reads by AI crawlersClaude0ChatGPT0Google · Gemini0Perplexity0Meta AI0Microsoft · Copilot0Amazon2Apple3China (ByteDance, Huawei, Baidu…)1ByteDance (Doubao)1Others8Total14Counted by the name each crawler declares; requests found to be impersonating one are left out. Google · Gemini includes Googlebot, the search crawler whose index Google also uses for its AI features. Other search engines and bots are under Others.
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.
C3 protein levels (rs556679). MyGeneLog™. https://www.mygenelog.com/variants/rs556679