chr4-122892388-A-C

Position:

• chr4-122892388-A-C

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2 BP4

The NM_001361665.2(FGF2):​c.460A>C​(p.Lys154Gln) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 1,461,730 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: FGF2 NM_001361665.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 8.15

Genes affected

FGF2 (HGNC:3676): (fibroblast growth factor 2) The protein encoded by this gene is a member of the fibroblast growth factor (FGF) family. FGF family members bind heparin and possess broad mitogenic and angiogenic activities. This protein has been implicated in diverse biological processes, such as limb and nervous system development, wound healing, and tumor growth. The mRNA for this gene contains multiple polyadenylation sites, and is alternatively translated from non-AUG (CUG) and AUG initiation codons, resulting in five different isoforms with distinct properties. The CUG-initiated isoforms are localized in the nucleus and are responsible for the intracrine effect, whereas, the AUG-initiated form is mostly cytosolic and is responsible for the paracrine and autocrine effects of this FGF. [provided by RefSeq, Jul 2008]

NUDT6 (HGNC:8053): (nudix hydrolase 6) This gene overlaps and lies on the opposite strand from FGF2 gene, and is thought to be the FGF2 antisense gene. The two genes are independently transcribed, and their expression shows an inverse relationship, suggesting that this antisense transcript may regulate FGF2 expression. This gene has also been shown to have hormone-regulatory and antiproliferative actions in the pituitary that are independent of FGF2 expression. Alternatively spliced transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Oct 2011]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.39829162).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
FGF2	NM_001361665.2	c.460A>C	p.Lys154Gln	missense_variant	3/3	ENST00000644866.2	NP_001348594.1
FGF2	NM_002006.6	c.859A>C	p.Lys287Gln	missense_variant	3/3		NP_001997.5

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
FGF2	ENST00000644866.2	c.460A>C	p.Lys154Gln	missense_variant	3/3		NM_001361665.2	ENSP00000494222	P1
FGF2	ENST00000264498.9	c.859A>C	p.Lys287Gln	missense_variant	3/3	1		ENSP00000264498
FGF2	ENST00000608478.1	c.460A>C	p.Lys154Gln	missense_variant	3/3	1		ENSP00000477134	P1
NUDT6	ENST00000608639.1	n.57+244T>G		intron_variant, non_coding_transcript_variant		3

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD3 exomes AF: 0.00000398 AC: 1 AN: 251384 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 135858

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.0000327

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1461730 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 727176

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: 0.0000232

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jan 17, 2024

The c.859A>C (p.K287Q) alteration is located in exon 3 (coding exon 3) of the FGF2 gene. This alteration results from a A to C substitution at nucleotide position 859, causing the lysine (K) at amino acid position 287 to be replaced by a glutamine (Q). 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	Pathogenic	0.67
BayesDel_addAF	Uncertain	0.016	T
BayesDel_noAF	Benign	-0.12
CADD	Uncertain	24
DANN	Uncertain	0.99
DEOGEN2	Benign	0.40	.;T;.;.
Eigen	Uncertain	0.50
Eigen_PC	Uncertain	0.56
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.87	D;D;.;D
M_CAP	Benign	0.037	D
MetaRNN	Benign	0.40	T;T;T;T
MetaSVM	Uncertain	0.037	D
MutationAssessor	Benign	1.8	.;L;.;.
PrimateAI	Uncertain	0.78	T
PROVEAN	Benign	-1.1	N;.;.;.
REVEL	Uncertain	0.47
Sift	Uncertain	0.022	D;.;.;.
Sift4G	Uncertain	0.044	D;D;T;.
Polyphen		0.83	.;P;.;.
Vest4		0.50
MutPred		0.19		Loss of methylation at K287 (P = 0.0464);Loss of methylation at K287 (P = 0.0464);.;.;
MVP		0.79
ClinPred		0.67	D
GERP RS		5.5
Varity_R		0.38
gMVP		0.31

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: rs1367982250; hg19: chr4-123813543;