Genetic Variant FAP:p.Val549Ile (chr2-162188338-C-T) – ACMG Classification: Uncertain_significance (2 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_004460.5(FAP):c.1645G>A(p.Val549Ile) variant causes a missense change. The variant allele was found at a frequency of 0.00000137 in 1,460,962 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.0000014 ( 0 hom. )

Consequence

FAP
NM_004460.5 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 5.50

Publications

0 publications found

Variant links:

Genes affected

FAP (HGNC:3590): (fibroblast activation protein alpha) The protein encoded by this gene is a homodimeric integral membrane gelatinase belonging to the serine protease family. It is selectively expressed in reactive stromal fibroblasts of epithelial cancers, granulation tissue of healing wounds, and malignant cells of bone and soft tissue sarcomas. This protein is thought to be involved in the control of fibroblast growth or epithelial-mesenchymal interactions during development, tissue repair, and epithelial carcinogenesis. Alternatively spliced transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Apr 2014]

FAP links:

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ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
FAP	NM_004460.5 link	c.1645G>A	p.Val549Ile	missense_variant	Exon 20 of 26	ENST00000188790.9	NP_004451.2	Q12884-1
FAP	NM_001291807.3 link	c.1570G>A	p.Val524Ile	missense_variant	Exon 19 of 25		NP_001278736.1	Q12884B4DLR2
FAP	XM_011510796.4 link	c.1615G>A	p.Val539Ile	missense_variant	Exon 19 of 25		XP_011509098.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
FAP	ENST00000188790.9 link	c.1645G>A	p.Val549Ile	missense_variant	Exon 20 of 26	1	NM_004460.5	ENSP00000188790.4		Q12884-1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

0.00000137

AC:

AN:

1460962

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

726762

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33428

American (AMR)

AF:

0.00

AC:

AN:

44620

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26084

East Asian (EAS)

AF:

0.00

AC:

AN:

39678

South Asian (SAS)

AF:

0.00

AC:

AN:

86212

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53398

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5760

European-Non Finnish (NFE)

AF:

0.00000180

AC:

AN:

1111446

Other (OTH)

AF:

0.00

AC:

AN:

60336

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.475

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Feb 19, 2025

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.1645G>A (p.V549I) alteration is located in exon 20 (coding exon 20) of the FAP gene. This alteration results from a G to A substitution at nucleotide position 1645, causing the valine (V) at amino acid position 549 to be replaced by an isoleucine (I). 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

Benign

0.18

BayesDel_addAF

Benign

-0.096

BayesDel_noAF

Benign

-0.38

CADD

Uncertain

(source)

DANN

Uncertain

1.0

DEOGEN2

Benign

0.33

.;T;.

Eigen

Uncertain

0.55

Eigen_PC

Uncertain

0.63

FATHMM_MKL

Pathogenic

0.98

LIST_S2

Benign

0.76

T;T;T

M_CAP

Benign

0.0068

MetaRNN

Uncertain

0.57

D;D;D

MetaSVM

Benign

-0.55

MutationAssessor

Uncertain

2.4

.;M;.

PhyloP100

5.5

PrimateAI

Uncertain

0.54

PROVEAN

Benign

-0.78

.;N;N

REVEL

Uncertain

0.33

Sift

Benign

0.070

.;T;T

Sift4G

Benign

0.074

T;T;T

Polyphen

0.17, 0.94

.;B;P

Vest4

0.71

MutPred

0.72

.;Loss of helix (P = 0.1299);.;

MVP

0.65

MPC

0.46

ClinPred

0.80

GERP RS

6.1

Varity_R

0.31

gMVP

0.45

Mutation Taster

=59/41

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.050

Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over