chr10-121593784-C-G

Variant names:

• chr10-121593784-C-G
• rs143978938
• NM_000141.5:c.34G>C

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 3P and 2B. PM2 PP2 BP4_Moderate

The NM_000141.5(FGFR2):​c.34G>C​(p.Val12Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000274 in 1,461,888 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. V12M) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000027 (0 hom.)
• Consequence: FGFR2 NM_000141.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.757
• Publications: 0 publications found

Genes affected

FGFR2 (HGNC:3689): (fibroblast growth factor receptor 2) The protein encoded by this gene is a member of the fibroblast growth factor receptor 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 is a high-affinity receptor for acidic, basic and/or keratinocyte growth factor, depending on the isoform. Mutations in this gene are associated with Crouzon syndrome, Pfeiffer syndrome, Craniosynostosis, Apert syndrome, Jackson-Weiss syndrome, Beare-Stevenson cutis gyrata syndrome, Saethre-Chotzen syndrome, and syndromic craniosynostosis. Multiple alternatively spliced transcript variants encoding different isoforms have been noted for this gene. [provided by RefSeq, Jan 2009]

FGFR2 Gene-Disease associations (from GenCC):

• Apert syndrome

  Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, ClinGen, PanelApp Australia, G2P, Genomics England PanelApp
• Beare-Stevenson cutis gyrata syndrome

  Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, ClinGen, G2P, Genomics England PanelApp
• Crouzon syndrome

  Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, Ambry Genetics, ClinGen, PanelApp Australia, Genomics England PanelApp, G2P
• Jackson-Weiss syndrome

  Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, Genomics England PanelApp, G2P
• LADD syndrome 1

  Inheritance: AD Classification: DEFINITIVE, STRONG, MODERATE Submitted by: Labcorp Genetics (formerly Invitae), G2P, Ambry Genetics
• Pfeiffer syndrome

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: ClinGen, PanelApp Australia, Labcorp Genetics (formerly Invitae), Ambry Genetics, Genomics England PanelApp, G2P
• Antley-Bixler syndrome without genital anomalies or disordered steroidogenesis

  Inheritance: AD Classification: STRONG Submitted by: Genomics England PanelApp, G2P
• bent bone dysplasia syndrome 1

  Inheritance: AD Classification: STRONG, MODERATE, SUPPORTIVE Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae), Orphanet
• familial scaphocephaly syndrome, McGillivray type

  Inheritance: AD Classification: STRONG, SUPPORTIVE Submitted by: Orphanet, Genomics England PanelApp
• Saethre-Chotzen syndrome

  Inheritance: AD Classification: STRONG Submitted by: PanelApp Australia, Genomics England PanelApp
• Antley-Bixler syndrome

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

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• Pfeiffer syndrome type 1

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• Pfeiffer syndrome type 2

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• Pfeiffer syndrome type 3

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Uncertain_significance. The variant received 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in the FGFR2 gene, where missense mutations are typically associated with disease (based on misZ statistic). The gene has 114 curated pathogenic missense variants (we use a threshold of 10). The gene has 24 curated benign missense variants. Gene score misZ: 2.402 (below the threshold of 3.09). Trascript score misZ: 4.4365 (above the threshold of 3.09). GenCC associations: The gene is linked to Pfeiffer syndrome type 3, Crouzon syndrome, Apert syndrome, Antley-Bixler syndrome, Beare-Stevenson cutis gyrata syndrome, Jackson-Weiss syndrome, bent bone dysplasia syndrome 1, Pfeiffer syndrome, Saethre-Chotzen syndrome, LADD syndrome 1, familial scaphocephaly syndrome, McGillivray type, LADD syndrome, Pfeiffer syndrome type 1, Pfeiffer syndrome type 2, Antley-Bixler syndrome without genital anomalies or disordered steroidogenesis.
• BP4: Computational evidence support a benign effect (MetaRNN=0.11731312).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
FGFR2	NM_000141.5	c.34G>C	p.Val12Leu	missense_variant	Exon 2 of 18	ENST00000358487.10	NP_000132.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
FGFR2	ENST00000358487.10	c.34G>C	p.Val12Leu	missense_variant	Exon 2 of 18	1	NM_000141.5	ENSP00000351276.6
FGFR2	ENST00000457416.7	c.34G>C	p.Val12Leu	missense_variant	Exon 2 of 18	1		ENSP00000410294.2
FGFR2	ENST00000369056.5	c.34G>C	p.Val12Leu	missense_variant	Exon 1 of 17	1		ENSP00000358052.1
FGFR2	ENST00000369058.7	c.34G>C	p.Val12Leu	missense_variant	Exon 2 of 17	1		ENSP00000358054.3
FGFR2	ENST00000613048.4	c.34G>C	p.Val12Leu	missense_variant	Exon 2 of 17	5		ENSP00000484154.1
FGFR2	ENST00000369061.8	c.34G>C	p.Val12Leu	missense_variant	Exon 1 of 15	1		ENSP00000358057.4
FGFR2	ENST00000369059.5	c.34G>C	p.Val12Leu	missense_variant	Exon 2 of 16	5		ENSP00000358055.1
FGFR2	ENST00000360144.7	c.34G>C	p.Val12Leu	missense_variant	Exon 2 of 17	2		ENSP00000353262.3
FGFR2	ENST00000604236.5	n.34G>C		non_coding_transcript_exon_variant	Exon 2 of 17	1		ENSP00000474109.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000274 AC: 4 AN: 1461888 Hom.: 0 Cov.: 31 AF XY: 0.00000138 AC XY: 1 AN XY: 727244

African (AFR) AF: 0.00 AC: 0 AN: 33480

American (AMR) AF: 0.00 AC: 0 AN: 44724

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26136

East Asian (EAS) AF: 0.00 AC: 0 AN: 39700

South Asian (SAS) AF: 0.00 AC: 0 AN: 86258

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53418

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 0.00000180 AC: 2 AN: 1112008

Other (OTH) AF: 0.0000331 AC: 2 AN: 60396

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

FGFR2-related craniosynostosis Uncertain:1

Oct 08, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces valine, which is neutral and non-polar, with leucine, which is neutral and non-polar, at codon 12 of the FGFR2 protein (p.Val12Leu). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with FGFR2-related conditions. An algorithm developed to predict the effect of missense changes on protein structure and function outputs the following: PolyPhen-2: "Benign". The leucine amino acid residue is found in multiple mammalian species, which suggests that this missense change does not adversely affect protein function. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.080
BayesDel_addAF	Benign	-0.0047	T
BayesDel_noAF	Benign	-0.24
CADD	Benign	14
DANN	Benign	0.87
DEOGEN2	Benign	0.34	.;.;.;T;.;.;T;.;T;.;.;.;.;.;.;.
Eigen	Benign	-0.61
Eigen_PC	Benign	-0.52
FATHMM_MKL	Benign	0.49	N
LIST_S2	Benign	0.84	T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T
M_CAP	Benign	0.021	T
MetaRNN	Benign	0.12	T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T
MetaSVM	Benign	-0.89	T
MutationAssessor	Benign	0.55	N;N;.;N;N;N;.;N;.;N;N;N;N;.;N;.
PhyloP100		0.76
PrimateAI	Benign	0.35	T
PROVEAN	Benign	0.25	N;N;.;N;N;N;N;N;N;N;N;N;N;N;N;.
REVEL	Uncertain	0.30
Sift	Benign	1.0	T;T;.;T;T;T;T;T;T;T;T;T;T;T;T;.
Sift4G	Benign	0.71	T;T;T;T;T;T;T;T;T;T;T;T;T;.;T;T
Polyphen		0.0	.;B;.;B;B;.;.;.;.;.;B;B;.;.;.;.
Vest4		0.14
MutPred		0.47		Loss of catalytic residue at V12 (P = 0.064);Loss of catalytic residue at V12 (P = 0.064);Loss of catalytic residue at V12 (P = 0.064);Loss of catalytic residue at V12 (P = 0.064);Loss of catalytic residue at V12 (P = 0.064);Loss of catalytic residue at V12 (P = 0.064);Loss of catalytic residue at V12 (P = 0.064);Loss of catalytic residue at V12 (P = 0.064);Loss of catalytic residue at V12 (P = 0.064);Loss of catalytic residue at V12 (P = 0.064);Loss of catalytic residue at V12 (P = 0.064);Loss of catalytic residue at V12 (P = 0.064);Loss of catalytic residue at V12 (P = 0.064);Loss of catalytic residue at V12 (P = 0.064);Loss of catalytic residue at V12 (P = 0.064);Loss of catalytic residue at V12 (P = 0.064);
MVP		0.65
MPC		0.22
ClinPred		0.038	T
GERP RS		0.59
PromoterAI		-0.031	Neutral
Varity_R		0.050
gMVP		0.38
Mutation Taster		=89/11	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: rs143978938; hg19: chr10-123353298;