4-1801863-G-T

Position:

• chr4-1801863-G-T

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2 PP3_Moderate

The NM_000142.5(FGFR3):​c.768G>T​(p.Gln256His) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000687 in 1,456,252 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as not provided (no stars).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 6.9e-7 (0 hom.)
• Consequence: FGFR3 NM_000142.5 missense
• Clinical Significance: not provided no classification provided O:1
• Conservation: PhyloP100: 1.81

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]

FGFR3 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.88

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
FGFR3	NM_000142.5	c.768G>T	p.Gln256His	missense_variant	7/18	ENST00000440486.8	NP_000133.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
FGFR3	ENST00000440486.8	c.768G>T	p.Gln256His	missense_variant	7/18	5	NM_000142.5	ENSP00000414914.2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 6.87e-7 AC: 1 AN: 1456252 Hom.: 0 Cov.: 39 AF XY: 0.00000138 AC XY: 1 AN XY: 723974

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: 9.01e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ClinVar

Significance: not provided

Submissions summary: Other:1

Revision: no classification provided

Submissions by phenotype

not specified Other:1

not provided, no classification provided

reference population

ITMI

Sep 19, 2013

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Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.90
BayesDel_addAF	Pathogenic	0.25	D
BayesDel_noAF	Uncertain	0.12
CADD	Uncertain	24
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.85	D;T;.;.;T;.;.
Eigen	Uncertain	0.19
Eigen_PC	Benign	0.16
FATHMM_MKL	Uncertain	0.89	D
LIST_S2	Benign	0.86	D;D;D;T;D;.;D
M_CAP	Pathogenic	0.83	D
MetaRNN	Pathogenic	0.88	D;D;D;D;D;D;D
MetaSVM	Uncertain	0.43	D
MutationAssessor	Benign	0.81	L;.;L;L;.;L;.
PrimateAI	Pathogenic	0.91	D
PROVEAN	Uncertain	-4.3	D;D;D;D;.;D;D
REVEL	Pathogenic	0.81
Sift	Uncertain	0.0010	D;D;D;D;.;D;D
Sift4G	Uncertain	0.019	D;D;D;D;D;D;D
Polyphen		0.48	P;D;B;D;.;D;.
Vest4		0.79
MutPred		0.69		Gain of disorder (P = 0.0995);Gain of disorder (P = 0.0995);Gain of disorder (P = 0.0995);Gain of disorder (P = 0.0995);Gain of disorder (P = 0.0995);Gain of disorder (P = 0.0995);.;
MVP		0.96
MPC		0.92
ClinPred		0.99	D
GERP RS		3.1
RBP_binding_hub_radar		0.92
RBP_regulation_power_radar		3.7
Varity_R		0.89
gMVP		0.81

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.15		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: rs587778354; hg19: chr4-1803590;