rs17883400

Positions:

• chr4-1801614-G-A

Variant summary

Our verdict is Benign. Variant got -7 ACMG points: 2P and 9B. PM2 BP4_Strong BP6 BS1

The NM_000142.5(FGFR3):​c.616-6G>A variant causes a splice region, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000243 in 1,607,594 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: 𝑓 0.00014 (0 hom., cov: 33)
  • Exomes 𝑓: 0.00025 (0 hom.)
• Consequence: FGFR3 NM_000142.5 splice_region, intron
• Scores: Splicing: ADA: 0.00004699
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1 B:3
• Conservation: PhyloP100: 1.12

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 Benign. Variant got -7 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.8).
• BP6: Variant 4-1801614-G-A is Benign according to our data. Variant chr4-1801614-G-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 255344.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=3, Uncertain_significance=1}.
• BS1: Variant frequency is greater than expected in population amr. gnomad4 allele frequency = 0.000138 (21/152376) while in subpopulation AMR AF= 0.000718 (11/15310). AF 95% confidence interval is 0.000402. There are 0 homozygotes in gnomad4. There are 9 alleles in male gnomad4 subpopulation. Median coverage is 33. This position pass quality control queck.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
FGFR3	NM_000142.5	c.616-6G>A		splice_region_variant, intron_variant		ENST00000440486.8	NP_000133.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
FGFR3	ENST00000440486.8	c.616-6G>A		splice_region_variant, intron_variant		5	NM_000142.5	ENSP00000414914.2

Frequencies

GnomAD3 genomes AF: 0.000138 AC: 21 AN: 152258 Hom.: 0 Cov.: 33

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000719

Gnomad ASJ AF: 0.000576

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.0000941

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.000103

Gnomad OTH AF: 0.00

GnomAD3 exomes AF: 0.000231 AC: 54 AN: 233954 Hom.: 0 AF XY: 0.000196 AC XY: 25 AN XY: 127824

Gnomad AFR exome AF: 0.0000691

Gnomad AMR exome AF: 0.000537

Gnomad ASJ exome AF: 0.000103

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.000101

Gnomad NFE exome AF: 0.000270

Gnomad OTH exome AF: 0.000694

GnomAD4 exome AF: 0.000254 AC: 369 AN: 1455218 Hom.: 0 Cov.: 38 AF XY: 0.000243 AC XY: 176 AN XY: 723500

Gnomad4 AFR exome AF: 0.0000599

Gnomad4 AMR exome AF: 0.000476

Gnomad4 ASJ exome AF: 0.000154

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.0000585

Gnomad4 NFE exome AF: 0.000292

Gnomad4 OTH exome AF: 0.000250

GnomAD4 genome AF: 0.000138 AC: 21 AN: 152376 Hom.: 0 Cov.: 33 AF XY: 0.000121 AC XY: 9 AN XY: 74516

Gnomad4 AFR AF: 0.00

Gnomad4 AMR AF: 0.000718

Gnomad4 ASJ AF: 0.000576

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.0000941

Gnomad4 NFE AF: 0.000103

Gnomad4 OTH AF: 0.00

Alfa AF: 0.000212 Hom.: 0

Bravo AF: 0.000246

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1 Benign:3

Revision: criteria provided, conflicting classifications

Submissions by phenotype

not provided Benign:2

Likely benign, criteria provided, single submitter	clinical testing	GeneDx	Dec 16, 2020	- -
Likely benign, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Dec 09, 2023	- -

Achondroplasia Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Baylor Genetics

Jun 06, 2018

This variant was determined to be of uncertain significance according to ACMG Guidelines, 2015 [PMID:25741868]. -

not specified Benign:1

Likely benign, criteria provided, single submitter

clinical testing

PreventionGenetics, part of Exact Sciences

-

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.80
CADD	Benign	7.7
DANN	Benign	0.87
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.000047
dbscSNV1_RF	Benign	0.020
SpliceAI score (max)		0.040		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: rs17883400; hg19: chr4-1803341; COSMIC: COSV105835025; COSMIC: COSV105835025;