rs774047997

chr4-1802011-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_000142.5(FGFR3):c.916G>A(p.Val306Ile) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000103 in 1,459,794 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★). Synonymous variant affecting the same amino acid position (i.e. V306V) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 34)
  • Exomes 𝑓: 0.000010 (0 hom.)
• Consequence: FGFR3 NM_000142.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 9.66

Genes affected

FGFR3 (HGNC:3690): (fibroblast growth factor receptor 3) This gene encodes a member of the fibroblast growth factor receptor (FGFR) family, with its amino acid sequence being highly conserved between members and among divergent species. FGFR family members differ from one another in their ligand affinities and tissue distribution. A full-length representative protein would consist of an extracellular region, composed of three immunoglobulin-like domains, a single hydrophobic membrane-spanning segment and a cytoplasmic tyrosine kinase domain. The extracellular portion of the protein interacts with fibroblast growth factors, setting in motion a cascade of downstream signals, ultimately influencing mitogenesis and differentiation. This particular family member binds acidic and basic fibroblast growth hormone and plays a role in bone development and maintenance. Mutations in this gene lead to craniosynostosis and multiple types of skeletal dysplasia. [provided by RefSeq, Aug 2017]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
FGFR3	NM_000142.5	c.916G>A	p.Val306Ile	missense_variant	7/18	ENST00000440486.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
FGFR3	ENST00000440486.8	c.916G>A	p.Val306Ile	missense_variant	7/18	5	NM_000142.5	P4

Frequencies

GnomAD3 genomes Cov.: 34

GnomAD3 exomes AF: 0.0000448 AC: 11 AN: 245456 Hom.: 0 AF XY: 0.0000149 AC XY: 2 AN XY: 133916

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.000292

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.0000328

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000103 AC: 15 AN: 1459794 Hom.: 0 Cov.: 37 AF XY: 0.00000551 AC XY: 4 AN XY: 726198

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.000224

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000348

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000180

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 34

ExAC AF: 0.0000497 AC: 6

Asia WGS AF: 0.000289 AC: 1 AN: 3478

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Jul 25, 2022

This sequence change replaces valine, which is neutral and non-polar, with isoleucine, which is neutral and non-polar, at codon 306 of the FGFR3 protein (p.Val306Ile). This variant is present in population databases (rs774047997, gnomAD 0.03%). This variant has not been reported in the literature in individuals affected with FGFR3-related conditions. ClinVar contains an entry for this variant (Variation ID: 582777). Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Tolerated"; PolyPhen-2: "Possibly Damaging"; Align-GVGD: "Class C0"). In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.14
BayesDel_addAF	Uncertain	0.039	T
BayesDel_noAF	Uncertain	0.12
Cadd	Uncertain	24
Dann	Uncertain	1.0
DEOGEN2	Benign	0.31	T;T;.;.;T;.
Eigen	Benign	0.11
Eigen_PC	Benign	0.21
FATHMM_MKL	Pathogenic	0.97	D
LIST_S2	Uncertain	0.90	D;D;D;D;D;.
M_CAP	Pathogenic	0.49	D
MetaRNN	Uncertain	0.47	T;T;T;T;T;T
MetaSVM	Uncertain	0.79	D
MutationAssessor	Benign	0.15	N;.;N;N;.;N
MutationTaster	Benign	1.0	D;D;D;D;D;D
PrimateAI	Pathogenic	0.83	D
PROVEAN	Benign	-0.44	N;N;N;N;.;N
REVEL	Uncertain	0.47
Sift	Benign	0.058	T;T;T;T;.;T
Sift4G	Benign	0.20	T;T;T;T;D;T
Polyphen		0.90	P;B;B;D;.;D
Vest4		0.68
MutPred		0.32		Loss of catalytic residue at V306 (P = 0.0292);Loss of catalytic residue at V306 (P = 0.0292);Loss of catalytic residue at V306 (P = 0.0292);Loss of catalytic residue at V306 (P = 0.0292);Loss of catalytic residue at V306 (P = 0.0292);Loss of catalytic residue at V306 (P = 0.0292);
MVP		0.90
MPC		0.45
ClinPred		0.19	T
GERP RS		4.0
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.23
gMVP		0.36

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs774047997; hg19: chr4-1803738; COSMIC: COSV53417648; COSMIC: COSV53417648;