rs515726222

Variant names:

• chr8-38428351-C-G
• NM_023110.3:c.443G>C

Your query was ambiguous. Multiple possible variants found:

• chr8-38428351-C-G
• chr8-38428351-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PVS1_Moderate PM2

The NM_001174067.2(FGFR1):​c.541+1G>C variant causes a splice donor, intron change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. 1/1 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: FGFR1 NM_001174067.2 splice_donor, intron
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 4.90

Genes affected

FGFR1 (HGNC:3688): (fibroblast growth factor receptor 1) The protein encoded by this gene is a member of the fibroblast growth factor receptor (FGFR) family, where amino acid sequence is highly conserved between members and throughout evolution. FGFR family members differ from one another in their ligand affinities and tissue distribution. A full-length representative protein consists 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 both acidic and basic fibroblast growth factors and is involved in limb induction. Mutations in this gene have been associated with Pfeiffer syndrome, Jackson-Weiss syndrome, Antley-Bixler syndrome, osteoglophonic dysplasia, and autosomal dominant Kallmann syndrome 2. Chromosomal aberrations involving this gene are associated with stem cell myeloproliferative disorder and stem cell leukemia lymphoma syndrome. Alternatively spliced variants which encode different protein isoforms have been described; however, not all variants have been fully characterized. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PVS1: Splicing +-2 bp (donor or acceptor) variant, product NOT destroyed by NMD, known LOF gene, truncates exone, which is 0.032786883 fraction of the gene. Cryptic splice site detected, with MaxEntScore 2.2, offset of 6, new splice context is: tgcGTgaga. Cryptic site results in inframe change. If cryptic site found is not functional and variant results in exon loss, it results in inframe change.
• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
FGFR1	NM_023110.3	c.443G>C	p.Arg148Pro	missense_variant	Exon 4 of 18	ENST00000447712.7	NP_075598.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
FGFR1	ENST00000447712.7	c.443G>C	p.Arg148Pro	missense_variant	Exon 4 of 18	1	NM_023110.3	ENSP00000400162.2
FGFR1	ENST00000356207.9	c.176G>C	p.Arg59Pro	missense_variant	Exon 3 of 17	1		ENSP00000348537.5
FGFR1	ENST00000397091.9	c.442+1G>C		splice_donor_variant, intron_variant	Intron 4 of 17	1		ENSP00000380280.5
FGFR1	ENST00000397108.8	c.442+1G>C		splice_donor_variant, intron_variant	Intron 5 of 18	1		ENSP00000380297.4
FGFR1	ENST00000397113.6	c.442+1G>C		splice_donor_variant, intron_variant	Intron 4 of 17	2		ENSP00000380302.2
FGFR1	ENST00000397103.5	c.175+1G>C		splice_donor_variant, intron_variant	Intron 2 of 15	5		ENSP00000380292.1
FGFR1	ENST00000326324.10	c.175+1G>C		splice_donor_variant, intron_variant	Intron 3 of 16	1		ENSP00000327229.6
FGFR1	ENST00000487647.5	n.*134G>C		non_coding_transcript_exon_variant	Exon 3 of 12	1		ENSP00000435254.1
FGFR1	ENST00000487647.5	n.*134G>C		3_prime_UTR_variant	Exon 3 of 12	1		ENSP00000435254.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Mar 17, 2022

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Not observed at significant frequency in large population cohorts (gnomAD); In silico analysis supports that this missense variant does not alter protein structure/function; Has not been previously published as pathogenic or benign to our knowledge -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.13
BayesDel_addAF	Pathogenic	0.39	D
BayesDel_noAF	Pathogenic	0.24
CADD	Pathogenic	26
DANN	Uncertain	0.99
Eigen	Uncertain	0.32
Eigen_PC	Uncertain	0.44
FATHMM_MKL	Uncertain	0.94	D
M_CAP	Uncertain	0.11	D
ClinPred		0.65	D
GERP RS		5.6

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr8-38285869;