chr11-69810342-G-A

Position:

• chr11-69810342-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 4P and 2B. PM1 PM2 BP4_Moderate

The NM_005247.4(FGF3):​c.683C>T​(p.Ser228Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000565 in 1,416,180 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000056 (0 hom.)
• Consequence: FGF3 NM_005247.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -0.401

Genes affected

FGF3 (HGNC:3681): (fibroblast growth factor 3) The protein encoded by this gene is a member of the fibroblast growth factor (FGF) family. FGF family members possess broad mitogenic and cell survival activities and are involved in a variety of biological processes including embryonic development, cell growth, morphogenesis, tissue repair, tumor growth and invasion. This gene was identified by its similarity with mouse fgf3/int-2, a proto-oncogene activated in virally induced mammary tumors in the mouse. Frequent amplification of this gene has been found in human tumors, which may be important for neoplastic transformation and tumor progression. Studies of the similar genes in mouse and chicken suggested the role in inner ear formation. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM1: In a chain Fibroblast growth factor 3 (size 221) in uniprot entity FGF3_HUMAN there are 18 pathogenic changes around while only 4 benign (82%) in NM_005247.4
• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.074026525).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
FGF3	NM_005247.4	c.683C>T	p.Ser228Leu	missense_variant	3/3	ENST00000334134.4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
FGF3	ENST00000334134.4	c.683C>T	p.Ser228Leu	missense_variant	3/3	1	NM_005247.4	P1
FGF3	ENST00000646078.1	n.530C>T		non_coding_transcript_exon_variant	3/3

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000565 AC: 8 AN: 1416180 Hom.: 0 Cov.: 30 AF XY: 0.00000574 AC XY: 4 AN XY: 697162

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: 0.00000738

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ExAC AF: 0.00000830 AC: 1

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

Oct 20, 2021

The c.683C>T (p.S228L) alteration is located in exon 3 (coding exon 3) of the FGF3 gene. This alteration results from a C to T substitution at nucleotide position 683, causing the serine (S) at amino acid position 228 to be replaced by a leucine (L). 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	0.087
BayesDel_addAF	Benign	-0.24	T
BayesDel_noAF	Benign	-0.58
CADD	Benign	8.0
DANN	Uncertain	0.98
DEOGEN2	Benign	0.36	T
Eigen	Benign	-1.1
Eigen_PC	Benign	-1.2
FATHMM_MKL	Benign	0.012	N
LIST_S2	Benign	0.43	T
M_CAP	Benign	0.030	D
MetaRNN	Benign	0.074	T
MetaSVM	Benign	-0.96	T
MutationAssessor	Benign	0.34	N
MutationTaster	Benign	1.0	N
PrimateAI	Benign	0.27	T
PROVEAN	Benign	-0.28	N
REVEL	Benign	0.15
Sift	Uncertain	0.0080	D
Sift4G	Benign	0.16	T
Polyphen		0.0	B
Vest4		0.13
MutPred		0.16		Loss of phosphorylation at S228 (P = 0.029);
MVP		0.79
MPC		0.25
ClinPred		0.090	T
GERP RS		0.72
Varity_R		0.061
gMVP		0.28

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

LitVar

Other links and lift over

dbSNP: rs782454437; hg19: chr11-69625110; COSMIC: COSV105220902;