chr11-69810617-C-G

Variant names:

• chr11-69810617-C-G
• rs35420992
• NM_005247.4:c.408G>C

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 2P and 5B. PM2 BP4_Strong BP7

The NM_005247.4(FGF3):​c.408G>C​(p.Thr136Thr) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000412 in 1,454,820 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. T136T) has been classified as Benign.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000041 (0 hom.)
• Consequence: FGF3 NM_005247.4 synonymous
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -2.11
• Publications: 10 publications found

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]

FGF3 Gene-Disease associations (from GenCC):

• deafness with labyrinthine aplasia, microtia, and microdontia

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: G2P, Orphanet, Labcorp Genetics (formerly Invitae), ClinGen

ACMG classification

Our verdict: Likely_benign. The variant received -3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.68).
• BP7: Synonymous conserved (PhyloP=-2.11 with no splicing effect.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_005247.4. 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
	FGF3	NM_005247.4	MANE Select	c.408G>C	p.Thr136Thr	synonymous	Exon 3 of 3	NP_005238.1	P11487

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	FGF3	ENST00000334134.4	TSL:1 MANE Select	c.408G>C	p.Thr136Thr	synonymous	Exon 3 of 3	ENSP00000334122.2	P11487
	FGF3	ENST00000646078.1		n.255G>C		non_coding_transcript_exon	Exon 3 of 3

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000412 AC: 6 AN: 1454820 Hom.: 0 Cov.: 32 AF XY: 0.00000692 AC XY: 5 AN XY: 722708

African (AFR) AF: 0.0000901 AC: 3 AN: 33308

American (AMR) AF: 0.00 AC: 0 AN: 44294

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25966

East Asian (EAS) AF: 0.00 AC: 0 AN: 39518

South Asian (SAS) AF: 0.0000116 AC: 1 AN: 85904

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 52206

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5744

European-Non Finnish (NFE) AF: 9.03e-7 AC: 1 AN: 1107856

Other (OTH) AF: 0.0000167 AC: 1 AN: 60024

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.68
CADD	Benign	2.5
DANN	Benign	0.55
PhyloP100		-2.1

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: rs35420992; hg19: chr11-69625385;