4-1804902-C-G

Variant names:

• chr4-1804902-C-G
• rs61735104
• NM_000142.5:c.1345C>G

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_000142.5(FGFR3):​c.1345C>G​(p.Pro449Ala) variant causes a missense change. The variant allele was found at a frequency of 0.000000715 in 1,397,744 control chromosomes in the GnomAD database, with no homozygous occurrence. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. P449L) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 34)
  • Exomes 𝑓: 7.2e-7 (0 hom.)
• Consequence: FGFR3 NM_000142.5 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 4.68
• Publications: 0 publications found

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 Gene-Disease associations (from GenCC):

• achondroplasia

  Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Orphanet, Genomics England PanelApp, G2P, Ambry Genetics, ClinGen
• Crouzon syndrome-acanthosis nigricans syndrome

  Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Orphanet, Ambry Genetics, ClinGen, Genomics England PanelApp, G2P
• hypochondroplasia

  Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), ClinGen, Orphanet, G2P, Ambry Genetics
• lacrimoauriculodentodigital syndrome 2

  Inheritance: AD Classification: DEFINITIVE Submitted by: G2P
• Muenke syndrome

  Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae), G2P, Orphanet, ClinGen, Genomics England PanelApp
• thanatophoric dysplasia

  Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
• thanatophoric dysplasia type 1

  Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: G2P, Orphanet, ClinGen, Ambry Genetics, Genomics England PanelApp
• thanatophoric dysplasia type 2

  Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: G2P, ClinGen, Orphanet, Labcorp Genetics (formerly Invitae), Genomics England PanelApp
• camptodactyly-tall stature-scoliosis-hearing loss syndrome

  Inheritance: AR, AD, SD Classification: DEFINITIVE, STRONG, MODERATE, SUPPORTIVE, LIMITED Submitted by: Labcorp Genetics (formerly Invitae), ClinGen, Orphanet, Ambry Genetics, G2P
• severe achondroplasia-developmental delay-acanthosis nigricans syndrome

  Inheritance: AD Classification: STRONG, MODERATE, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Orphanet, ClinGen
• isolated brachycephaly

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• isolated plagiocephaly

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• LADD syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• LADD syndrome 1

  Inheritance: AD Classification: LIMITED Submitted by: Labcorp Genetics (formerly Invitae)

ACMG classification

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

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

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000142.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	FGFR3	NM_000142.5	MANE Select	c.1345C>G	p.Pro449Ala	missense	Exon 10 of 18	NP_000133.1	P22607-1
	FGFR3	NM_001163213.2		c.1351C>G	p.Pro451Ala	missense	Exon 10 of 18	NP_001156685.1	P22607-2
	FGFR3	NM_001354809.2		c.1348C>G	p.Pro450Ala	missense	Exon 10 of 18	NP_001341738.1	X5D2G8

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	FGFR3	ENST00000440486.8	TSL:5 MANE Select	c.1345C>G	p.Pro449Ala	missense	Exon 10 of 18	ENSP00000414914.2	P22607-1
	FGFR3	ENST00000481110.7	TSL:1	c.1348C>G	p.Pro450Ala	missense	Exon 10 of 17	ENSP00000420533.2	F8W9L4
	FGFR3	ENST00000352904.6	TSL:1	c.1009C>G	p.Pro337Ala	missense	Exon 7 of 15	ENSP00000231803.1	P22607-3

Frequencies

GnomAD3 genomes Cov.: 34

GnomAD4 exome AF: 7.15e-7 AC: 1 AN: 1397744 Hom.: 0 Cov.: 33 AF XY: 0.00000145 AC XY: 1 AN XY: 689416

African (AFR) AF: 0.00 AC: 0 AN: 31572

American (AMR) AF: 0.00 AC: 0 AN: 35700

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25172

East Asian (EAS) AF: 0.00 AC: 0 AN: 35742

South Asian (SAS) AF: 0.00 AC: 0 AN: 79208

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 48248

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5236

European-Non Finnish (NFE) AF: 9.27e-7 AC: 1 AN: 1078920

Other (OTH) AF: 0.00 AC: 0 AN: 57946

GnomAD4 genome Cov.: 34

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.066
BayesDel_addAF	Uncertain	0.13	D
BayesDel_noAF	Uncertain	-0.050
CADD	Benign	22
DANN	Benign	0.91
DEOGEN2	Pathogenic	0.87	D
Eigen	Uncertain	0.27
Eigen_PC	Benign	0.19
FATHMM_MKL	Uncertain	0.95	D
LIST_S2	Uncertain	0.89	D
M_CAP	Pathogenic	0.56	D
MetaRNN	Uncertain	0.43	T
MetaSVM	Uncertain	0.63	D
MutationAssessor	Uncertain	2.2	M
PhyloP100		4.7
PrimateAI	Uncertain	0.55	T
PROVEAN	Pathogenic	-4.7	D
REVEL	Uncertain	0.56
Sift	Benign	0.053	T
Sift4G	Benign	0.12	T
Polyphen		0.76	P
Vest4		0.48
MutPred		0.23		Loss of glycosylation at P449 (P = 0.167)
MVP		0.94
MPC		0.79
ClinPred		0.94	D
GERP RS		4.0
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.28
gMVP		0.54
Mutation Taster		=74/26	polymorphism

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

Other links and lift over

dbSNP: rs61735104; hg19: chr4-1806629;