rs121913105
A SNP in the FGFR3 gene on chromosome 4. Its most notable genotype is A;T: Achondroplasia/dwarfism
- Gene
- FGFR3
- Location
- Chr 41,806,163 (GRCh38)
- Highest magnitude
- 6.6Very important
- Tested on
- AncestryDNA
Genotypes
As shown in 23andMe and AncestryDNA files.
- A;AGoodcommon in clinvar
- A;TMost notableBadAchondroplasia/dwarfism
On SNPedia: (A;A), (A;T). Magnitude rates how notable a genotype is from 0 to 10, not how risky it is.
Related
Conditions, medicines and genes
Other FGFR3 SNPs
- i5001264A;TAchondroplasia/dwarfismVery important
- i5001267G;TAchondroplasia/dwarfism?Very important
- i5001274A;TAchondroplasia/dwarfismVery important
- rs28931614A;GAchondroplasia/dwarfismVery important
- rs75790268G;TAchondroplasia/dwarfismVery important
- rs77722678G;GHypochondroplasiaVery important
- rs121913114A;TAchondroplasia/dwarfismVery important
- rs267606809G;TAchondroplasia/dwarfism?Very important
Notes
From SNPedia
Notes
rs121913105, also known as Lys650Met or K650M, is a mutation in the FGFR3 gene on chromosome 4. Acting in an autosomal dominant manner, the rs121913105(T) allele is considered to cause achondroplasia, or at least a term called "SADDAN dysplasia"; see also OMIM 134934.0015. Note that 23andMe refers to this SNP as i5001274 and i6010277.
A;T
See discussion at rs121913105
Source and license
Adapted from rs121913105 on SNPedia, using a snapshot taken October 16, 2026. SNPedia content is shared under CC BY-NC-SA 3.0 US, and this page is shared under the same license.
SNPedia is a community-edited wiki. Its entries can be incomplete, out of date or wrong, and nothing here is a diagnosis or medical advice. Magnitude is a community rating of how interesting a genotype is, not a risk score.