{{Rsnum
|rsid=121912472
|geno1=(C;C)
|geno2=(C;G)
|geno3=(G;G)
|Chromosome=9
|Orientation=plus
|Gene=JAK2
|position=5073742
|Gene_s=JAK2
|Assembly=GRCh37.p5
|GenomeBuild=37.3
|dbSNPBuild=135
}}[[rs121912472]], also known as Lys607Asn, is a variant likely to be acquired (i.e. somatic) in the Janus kinase 2 [[JAK2]] gene. The (rare) [[rs121912472]](C) variant may be associated with certain myeloproliferative disorders. 

See: OMIM [http://omim.org/entry/147796#0002 147796.0002]
{{omim
|id=147796
|rsnum=121912472
|variant=0002
}}{{ClinVar
|rsid=121912472
|Reversed=0
|FwdREF=G
|FwdALT=C
|REF=G
|ALT=C
|RSPOS=5073742
|CHROM=9
|dbSNPBuildID=133
|SSR=0
|SAO=1
|VP=0x050260000000000002110100
|GENEINFO=JAK2:3717
|GENE_NAME=JAK2
|GENE_ID=3717
|WGT=0
|VC=SNV
|CLNALLE=1
|CLNHGVS=NC_000009.11:g.5073742G>C
|CLNORIGIN=1
|CLNSIG=255
|Tags=PM;S3D;OTHERKG;LSD;OM
|CLNACC=RCV000015773.1
|CLNDBN=Leukemia, acute myelogenous, somatic
|CLNSRC=OMIM Allelic Variant
|CLNSRCID=147796.0002
|Disease=Leukemia
}}