{{Rsnum
|rsid=121912442
|Chromosome=21
|Orientation=plus
|geno1=(C;C)
|geno2=(C;T)
|geno3=(T;T)
|Gene=SOD1
|position=31659783
|Gene_s=SOD1
|Assembly=GRCh38
|GenomeBuild=38.1
|dbSNPBuild=141
}}{{omim
|id=147450
|rsnum=121912442
|variant=0012
}}{{ClinVar
|rsid=121912442
|Reversed=0
|FwdREF=C
|FwdALT=T
|REF=C
|ALT=T
|RSPOS=33032096
|CHROM=21
|dbSNPBuildID=133
|SSR=0
|SAO=1
|VP=0x050260000000000002110100
|GENEINFO=SOD1:6647
|GENE_NAME=SOD1
|GENE_ID=6647
|WGT=0
|VC=SNV
|CLNALLE=1
|CLNHGVS=NC_000021.8:g.33032096C>T
|CLNSRC=OMIM Allelic Variant
|CLNORIGIN=1
|CLNSRCID=147450.0012
|CLNSIG=5
|CLNCUI=C1862939
|CLNDBN=Amyotrophic lateral sclerosis type 1
|Disease=Amyotrophic lateral sclerosis type 1
|CLNACC=RCV000015885.24
|Tags=PM;S3D;OTHERKG;LSD;OM
|CLNDSDB=GeneReviews:MedGen:OMIM:Orphanet
|CLNDSDBID=NBK1450:C1862939:105400:803
}} 
A polymorphism on the [[SOD1]] gene known as A4V.