4-1793941-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_000142.5(FGFR3):c.7G>A(p.Ala3Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 13/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 34)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: FGFR3 NM_000142.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -0.0370

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 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.22039449).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
FGFR3	NM_000142.5	c.7G>A	p.Ala3Thr	missense_variant	2/18	ENST00000440486.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
FGFR3	ENST00000440486.8	c.7G>A	p.Ala3Thr	missense_variant	2/18	5	NM_000142.5	P4

Frequencies

GnomAD3 genomes Cov.: 34

GnomAD4 exome Data not reliable, filtered out with message: AC0;AS_VQSR AF: 0.00 AC: 0 AN: 1166638 Hom.: 0 Cov.: 28 AF XY: 0.00 AC XY: 0 AN XY: 564880

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 34

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Inborn genetic diseases Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jun 29, 2023

The c.7G>A (p.A3T) alteration is located in exon 2 (coding exon 1) of the FGFR3 gene. This alteration results from a G to A substitution at nucleotide position 7, causing the alanine (A) at amino acid position 3 to be replaced by a threonine (T). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.11
BayesDel_addAF	Benign	-0.16	T
BayesDel_noAF	Benign	-0.46
Cadd	Benign	18
Dann	Uncertain	0.98
DEOGEN2	Benign	0.38	T;T;.;.;T;.
Eigen	Benign	-0.99
Eigen_PC	Benign	-1.0
FATHMM_MKL	Benign	0.11	N
LIST_S2	Benign	0.73	T;T;T;T;T;.
M_CAP	Pathogenic	0.98	D
MetaRNN	Benign	0.22	T;T;T;T;T;T
MetaSVM	Benign	-0.83	T
MutationAssessor	Benign	0.0	N;.;N;N;.;N
MutationTaster	Benign	1.0	N;N;N;N;N;N
PrimateAI	Uncertain	0.65	T
PROVEAN	Benign	0.060	N;N;N;N;.;N
REVEL	Benign	0.23
Sift	Benign	0.21	T;D;T;D;.;D
Sift4G	Benign	0.42	T;T;T;T;T;T
Polyphen		0.0	B;B;B;B;.;B
Vest4		0.045
MutPred		0.11		Gain of glycosylation at A3 (P = 0.0378);Gain of glycosylation at A3 (P = 0.0378);Gain of glycosylation at A3 (P = 0.0378);Gain of glycosylation at A3 (P = 0.0378);Gain of glycosylation at A3 (P = 0.0378);Gain of glycosylation at A3 (P = 0.0378);
MVP		0.89
MPC		0.27
ClinPred		0.14	T
GERP RS		0.72
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.0
Varity_R		0.042
gMVP		0.32

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		Details are displayed if max score is > 0.2

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

Publications

No publications associated with this variant yet.

Other links and lift over

hg19: chr4-1795668;