FGFR3 p.Pro550=
c.1650C>T · rs749387483 · VCV2872506
Likely benign
Multiple submitters
Classification
Likely benign
ClinVar
Review
Multiple submitters ★★☆☆
ClinVar · 2 submitters
gnomAD v4.1
Rare
very rare (popmax 0.005%, amr)
Computational evidence
| Protein change | ||
| Missense predictors do not apply to this variant type; conservation carries the signal. | ||
| Splicing | ||
| SpliceAI | — | not assessed · no allele here is in the release |
|---|---|---|
| Constraint at this position | ||
| Conservation | phyloP 0.34 | GERP -0.59, phastCons 0.002 |
| Overall | ||
| CADD | 10.71 | PHRED · no single calibrated threshold — expert panels disagree |
Population frequency
gnomAD v4.1 · exomes + genomes
Grpmax group
0.005%
Admixed American · 3/60,000 alleles
Filtering AF
0.00133%
ClinGen BA1/BS1 input
FAF95, joint · FAF99 0.000668%
Overall
0.00031%
5/1,612,488 alleles · very rare
exomes 5/1,460,204 · genomes 0/152,284 · joint denominator
| Ancestry group | Frequency | 1 in |
|---|---|---|
| Admixed Americangrpmax | 0.005% | 20,000 |
| European (non-Finnish) | 0.00017% | 589,842 |
Rarity supports pathogenicity (ACMG PM2); frequency above a disease-specific BA1/BS1 threshold argues against it. A variant frequent in one ancestry group can be near-absent in others, so a single global figure can mislead.
Variant & gene context
- Gene
- FGFR3
- Protein
- p.Pro550=
- Coding
- c.1650C>T
- MANE Select
- NM_000142
- dbSNP
- rs749387483
- Type
- single nucleotide variant
- Location
- chr4:1805754 (GRCh38)
- Gene constraint
- LOEUF 0.458 · pLI 1.00 · ClinGen HI 0/3 (gnomAD)
- Structure
- AlphaFold pLDDT 75.25 · 16 PDB
- Residue 550
- a β-strand; the protein kinase domain
Similar variants
- FGFR3 p.Pro550His Likely pathogenic ★ same residue
- FGFR3 p.Ala391Glu Pathogenic ★★ same type
- FGFR3 p.Arg248Cys Pathogenic ★★ same type
- FGFR3 p.Arg621His Pathogenic/Likely pathogenic ★★ same type
- FGFR3 p.Asn540Asp Pathogenic/Likely pathogenic ★★ same type
- FGFR3 p.Asn540Lys Pathogenic ★★ same type
- FGFR3 p.Asn540Ser Pathogenic/Likely pathogenic ★★ ⚠ same type
- FGFR3 p.Asn540Thr Pathogenic/Likely pathogenic ★★ same type
Built on 18 open, versioned datasets — ClinVar, gnomAD, AlphaMissense, REVEL, ClinGen & more — plus Sugi Variant's own cross-source analysis. Source data 2026-01–2026-10, ClinVar 2026-10. Full sources & versions →
Cite Sugi Variant
Gür T. Sugi Variant: A Deterministic Per-Variant Germline Reference from a Knowledge Graph for Humans and AI Agents. 2026. doi:10.5281/zenodo.21509445. This variant: https://sugi.bio/variant/fgfr3-p-pro550 (accessed [today's date]).
Preprint & method: sugi.bio/variant/method Machine-readable: this page as Markdown