Genetic Variant FAP:p.Met567Thr (chr2-162188283-A-G) – 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.1700T>C(p.Met567Thr) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000684 in 1,461,250 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: 0.0000068 ( 0 hom. )

Consequence

FAP
NM_004460.5 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 8.71

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.1700T>C	p.Met567Thr	missense_variant	Exon 20 of 26	ENST00000188790.9	NP_004451.2	Q12884-1
FAP	NM_001291807.3 link	c.1625T>C	p.Met542Thr	missense_variant	Exon 19 of 25		NP_001278736.1	Q12884B4DLR2
FAP	XM_011510796.4 link	c.1670T>C	p.Met557Thr	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.1700T>C	p.Met567Thr	missense_variant	Exon 20 of 26	1	NM_004460.5	ENSP00000188790.4		Q12884-1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD2 exomes

AF:

0.00000797

AC:

AN:

251088

AF XY:

0.0000147

show subpopulations

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 FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000176

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000684

AC:

AN:

1461250

Hom.:

Cov.:

AF XY:

0.00000963

AC XY:

AN XY:

726940

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33446

American (AMR)

AF:

0.00

AC:

AN:

44674

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26100

East Asian (EAS)

AF:

0.00

AC:

AN:

39690

South Asian (SAS)

AF:

0.00

AC:

AN:

86238

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53412

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.00000900

AC:

AN:

1111558

Other (OTH)

AF:

0.00

AC:

AN:

60364

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.495

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

Alfa

AF:

0.0000712

Hom.:

Bravo

AF:

0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Apr 22, 2024

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.1700T>C (p.M567T) alteration is located in exon 20 (coding exon 20) of the FAP gene. This alteration results from a T to C substitution at nucleotide position 1700, causing the methionine (M) at amino acid position 567 to be replaced by a threonine (T). 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

Uncertain

0.43

BayesDel_addAF

Benign

-0.068

BayesDel_noAF

Benign

-0.32

CADD

Benign

(source)

DANN

Uncertain

0.98

DEOGEN2

Benign

0.17

.;T;.

Eigen

Benign

0.022

Eigen_PC

Uncertain

0.28

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Benign

0.82

T;T;T

M_CAP

Benign

0.0054

MetaRNN

Uncertain

0.68

D;D;D

MetaSVM

Benign

-1.0

MutationAssessor

Benign

-0.11

.;N;.

PhyloP100

8.7

PrimateAI

Uncertain

0.51

PROVEAN

Benign

-1.8

.;N;N

REVEL

Benign

0.20

Sift

Uncertain

0.0010

.;D;D

Sift4G

Uncertain

0.0030

D;D;D

Polyphen

0.0010, 0.0

.;B;B

Vest4

0.66

MutPred

0.82

.;Gain of glycosylation at S563 (P = 0.1872);.;

MVP

0.48

MPC

0.29

ClinPred

0.60

GERP RS

6.1

Varity_R

0.72

gMVP

0.52

Mutation Taster

=56/44

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

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

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chr2-162188283-A-G

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over