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UniProtKB/Swiss-Prot P22607: Variant p.Lys650Gln

Fibroblast growth factor receptor 3
Gene: FGFR3
Variant information

Variant position:  650
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Type of variant:  Disease [Disclaimer]
The variants are classified into three categories: Disease, Polymorphism and Unclassified.
  • Disease: Variants implicated in disease according to literature reports.
  • Polymorphism: Variants not reported to be implicated in disease.
  • Unclassified: Variants with uncertain implication in disease according to literature reports. Evidence against or in favor of a pathogenic role is limited and/or conflicting.

Residue change:  From Lysine (K) to Glutamine (Q) at position 650 (K650Q, p.Lys650Gln).
Indicates the amino acid change of the variant. The one-letter and three-letter codes for amino acids used in UniProtKB/Swiss-Prot are those adopted by the commission on Biochemical Nomenclature of the IUPAC-IUB.

Physico-chemical properties:  Change from large size and basic (K) to medium size and polar (Q)
The physico-chemical property of the reference and variant residues and the change implicated.

BLOSUM score:  1
The score within a Blosum matrix for the corresponding wild-type to variant amino acid change. The log-odds score measures the logarithm for the ratio of the likelihood of two amino acids appearing by chance. The Blosum62 substitution matrix is used. This substitution matrix contains scores for all possible exchanges of one amino acid with another:
  • Lowest score: -4 (low probability of substitution).
  • Highest score: 11 (high probability of substitution).
More information can be found on the following page

Involvement in disease:  Hypochondroplasia (HCH) [MIM:146000]: Autosomal dominant disease and is characterized by disproportionate short stature. It resembles achondroplasia, but with a less severe phenotype. {ECO:0000269|PubMed:10215410, ECO:0000269|PubMed:10777366, ECO:0000269|PubMed:11055896, ECO:0000269|PubMed:12707965, ECO:0000269|PubMed:7670477, ECO:0000269|PubMed:9452043}. Note=The disease is caused by mutations affecting the gene represented in this entry.
The name and a short description of the disease associated with the variant. For more information about the disease, the user can refer to OMIM, following the link provided after the disease acronym.

Involvement in disease:  Bladder cancer (BLC) [MIM:109800]: A malignancy originating in tissues of the urinary bladder. It often presents with multiple tumors appearing at different times and at different sites in the bladder. Most bladder cancers are transitional cell carcinomas that begin in cells that normally make up the inner lining of the bladder. Other types of bladder cancer include squamous cell carcinoma (cancer that begins in thin, flat cells) and adenocarcinoma (cancer that begins in cells that make and release mucus and other fluids). Bladder cancer is a complex disorder with both genetic and environmental influences. {ECO:0000269|PubMed:10471491, ECO:0000269|PubMed:11314002}. Note=Disease susceptibility is associated with variations affecting the gene represented in this entry. Somatic mutations can constitutively activate FGFR3.
The name and a short description of the disease associated with the variant. For more information about the disease, the user can refer to OMIM, following the link provided after the disease acronym.

Variant description:  In hypochondroplasia and BLC; in hypochondroplasia the form is milder than that seen in individuals with the K-540 or M-650 mutations; constitutively activated kinase.
Any additional useful information about the variant.

Other resources:  
Links to websites of interest for the variant.

Sequence information

Variant position:  650
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  806
The length of the canonical sequence.

The residue change on the sequence. Unless the variant is located at the beginning or at the end of the protein sequence, both residues upstream (20) and downstream (20) of the variant will be shown.

Residue conservation: 
The multiple alignment of the region surrounding the variant against various orthologous sequences.






Sequence annotation in neighborhood:  
The regions or sites of interest surrounding the variant. In general the features listed are posttranslational modifications, binding sites, enzyme active sites, local secondary structure or other characteristics reported in the cited references. The "Sequence annotation in neighborhood" lines have a fixed format:
  • Type: the type of sequence feature.
  • Positions: endpoints of the sequence feature.
  • Description: contains additional information about the feature.

Chain 23 – 806 Fibroblast growth factor receptor 3
Topological domain 397 – 806 Cytoplasmic
Domain 472 – 761 Protein kinase
Modified residue 647 – 647 Phosphotyrosine; by autocatalysis
Modified residue 648 – 648 Phosphotyrosine; by autocatalysis
Mutagenesis 650 – 650 K -> D. Constitutively activated kinase.
Mutagenesis 650 – 650 K -> L. Constitutively activated kinase.

Literature citations

Profound ligand-independent kinase activation of fibroblast growth factor receptor 3 by the activation loop mutation responsible for a lethal skeletal dysplasia, thanatophoric dysplasia type II.
Webster M.K.; D'Avis P.Y.; Robertson S.C.; Donoghue D.J.;
Mol. Cell. Biol. 16:4081-4087(1996)

Distinct missense mutations of the FGFR3 Lys650 codon modulate receptor kinase activation and the severity of the skeletal dysplasia phenotype.
Bellus G.A.; Spector E.B.; Speiser P.W.; Weaver C.A.; Garber A.T.; Bryke C.R.; Israel J.; Rosengren S.S.; Webster M.K.; Donoghue D.J.; Francomano C.A.;
Am. J. Hum. Genet. 67:1411-1421(2000)

Loss of heterozygosity at 4p16.3 and mutation of FGFR3 in transitional cell carcinoma.
Sibley K.; Cuthbert-Heavens D.; Knowles M.A.;
Oncogene 20:686-691(2001)

Disclaimer: Any medical or genetic information present in this entry is provided for research, educational and informational purposes only. They are not in any way intended to be used as a substitute for professional medical advice, diagnostic, treatment or care.