{{Rsnum
|rsid=11569562
|Gene=C3
|Chromosome=19
|position=6678742
|Orientation=minus
|GMAF=0.4862
|Assembly=GRCh38
|GenomeBuild=38.1
|dbSNPBuild=141
|geno1=(C;C)
|geno2=(C;T)
|geno3=(T;T)
|Gene_s=C3
}}{{ population diversity
| geno1=(C;C)
| geno2=(C;T)
| geno3=(T;T)
| CEU | 0.0 | 0.0 | 0.0
| HCB | 25.6 | 48.7 | 25.6
| JPT | 12.5 | 60.0 | 27.5
| YRI | 18.3 | 43.3 | 38.3
| ASW | 0.0 | 0.0 | 0.0
| CHB | 25.6 | 48.7 | 25.6
| CHD | 0.0 | 0.0 | 0.0
| GIH | 0.0 | 0.0 | 0.0
| LWK | 0.0 | 0.0 | 0.0
| MEX | 0.0 | 0.0 | 0.0
| MKK | 0.0 | 0.0 | 0.0
| TSI | 0.0 | 0.0 | 0.0
| HapMapRevision=28
}}
A SNP in the [[C3]] gene, [[rs11569562]], has been associated with increased risk for adult bronchial [[asthma]] in a study of Japanese patients.{{PMID|18566738}}

{{PMID Auto
|PMID=19828715
|Title=Complement component 3 polymorphisms interact with polyunsaturated fatty acids to modulate risk of metabolic syndrome.
}}

{{on chip | 23andMe v3}}
{{on chip | 23andMe v4}}
{{on chip | FTDNA2}}
{{on chip | HumanOmni1Quad}}