17-7675176-A-C

Variant names:

• chr17-7675176-A-C
• rs786203064
• NM_000546.6:c.436T>G

Variant summary

Our verdict is Uncertain significance. The variant received 5 ACMG points: 6P and 1B. BP4 PM2_Supporting PS4_Supporting PS3

This summary comes from the ClinGen Evidence Repository: The NM_000546.6: c.436T>G variant in TP53 is a missense variant predicted to cause substitution of tryptophan by glycine at amino acid 146 (p.Trp146Gly). This variant has been reported in 2 families, one meeting Classic and one Revised Chompret criteria. Based on this evidence, this variant scores 1.5 total points meeting the TP53 VCEP phenotype scoring criteria of 1-1.5 points. (PS4_Supporting; Internal lab contributors). This variant is absent from gnomAD v4.1.0 (PM2_Supporting). In vitro assays performed in yeast and/or human cell lines showed non-functional transactivation and loss of growth suppression activity indicating that this variant impacts protein function (PS3; PMIDs: 12826609, 30224644). Computational predictor scores (BayesDel = 0.0351; Align GVGD Class 0) are below the recommended thresholds (BayesDel < 0.16 and > -0.008 and an Align GVGD Class ≤ 55), evidence that does not predict a damaging effect on TP53 via protein change. SpliceAI predicts that the variant has no impact on splicing (BP4). In summary, this variant meets the criteria to be classified as Uncertain Significance for Li Fraumeni syndrome based on the ACMG/AMP criteria applied, as specified by the ClinGen TP53 VCEP: PS4_Supporting, PM2_Supporting, PS3, BP4. (Bayesian Points: 5; VCEP specifications version 2.3) LINK:https://erepo.genome.network/evrepo/ui/classification/CA000190/MONDO:0018875/009

• Frequency: Genomes: not found (cov: 33)
• Consequence: TP53 NM_000546.6 missense
• Clinical Significance: Uncertain significance reviewed by expert panel U:2
• Conservation: PhyloP100: 1.07
• Publications: 24 publications found

Genes affected

TP53 (HGNC:11998): (tumor protein p53) This gene encodes a tumor suppressor protein containing transcriptional activation, DNA binding, and oligomerization domains. The encoded protein responds to diverse cellular stresses to regulate expression of target genes, thereby inducing cell cycle arrest, apoptosis, senescence, DNA repair, or changes in metabolism. Mutations in this gene are associated with a variety of human cancers, including hereditary cancers such as Li-Fraumeni syndrome. Alternative splicing of this gene and the use of alternate promoters result in multiple transcript variants and isoforms. Additional isoforms have also been shown to result from the use of alternate translation initiation codons from identical transcript variants (PMIDs: 12032546, 20937277). [provided by RefSeq, Dec 2016]

TP53 Gene-Disease associations (from GenCC):

• breast cancer

  Inheritance: AD Classification: DEFINITIVE Submitted by: Ambry Genetics
• Li-Fraumeni syndrome

  Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), G2P, ClinGen, Orphanet
• Li-Fraumeni syndrome 1

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Ambry Genetics, Genomics England PanelApp
• adrenocortical carcinoma, hereditary

  Inheritance: AD Classification: STRONG Submitted by: Ambry Genetics
• sarcoma

  Inheritance: AD Classification: STRONG Submitted by: Genomics England PanelApp
• bone marrow failure syndrome 5

  Inheritance: AD Classification: MODERATE Submitted by: Ambry Genetics
• colorectal cancer

  Inheritance: AD Classification: MODERATE Submitted by: Ambry Genetics
• choroid plexus carcinoma

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Uncertain_significance. The variant received 5 ACMG points.

• PS3: For more information check the summary or visit ClinGen Evidence Repository.
• PS4: For more information check the summary or visit ClinGen Evidence Repository.
• PM2: For more information check the summary or visit ClinGen Evidence Repository.
• BP4: For more information check the summary or visit ClinGen Evidence Repository.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TP53	NM_000546.6	c.436T>G	p.Trp146Gly	missense_variant	Exon 5 of 11	ENST00000269305.9	NP_000537.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TP53	ENST00000269305.9	c.436T>G	p.Trp146Gly	missense_variant	Exon 5 of 11	1	NM_000546.6	ENSP00000269305.4

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 35

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: reviewed by expert panel

Submissions by phenotype

Li-Fraumeni syndrome Uncertain:1

Mar 04, 2025

ClinGen TP53 Variant Curation Expert Panel, ClinGen

Significance: Uncertain significance

Review Status: reviewed by expert panel

Collection Method: curation

The NM_000546.6: c.436T>G variant in TP53 is a missense variant predicted to cause substitution of tryptophan by glycine at amino acid 146 (p.Trp146Gly). This variant has been reported in 2 families, one meeting Classic and one Revised Chompret criteria. Based on this evidence, this variant scores 1.5 total points meeting the TP53 VCEP phenotype scoring criteria of 1-1.5 points. (PS4_Supporting; Internal lab contributors). This variant is absent from gnomAD v4.1.0 (PM2_Supporting). In vitro assays performed in yeast and/or human cell lines showed non-functional transactivation and loss of growth suppression activity indicating that this variant impacts protein function (PS3; PMIDs: 12826609, 30224644). Computational predictor scores (BayesDel = 0.0351; Align GVGD Class 0) are below the recommended thresholds (BayesDel < 0.16 and > -0.008 and an Align GVGD Class ≤ 55), evidence that does not predict a damaging effect on TP53 via protein change. SpliceAI predicts that the variant has no impact on splicing (BP4). In summary, this variant meets the criteria to be classified as Uncertain Significance for Li Fraumeni syndrome based on the ACMG/AMP criteria applied, as specified by the ClinGen TP53 VCEP: PS4_Supporting, PM2_Supporting, PS3, BP4. (Bayesian Points: 5; VCEP specifications version 2.3) -

Hereditary cancer-predisposing syndrome Uncertain:1

Jun 29, 2023

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.W146G variant (also known as c.436T>G), located in coding exon 4 of the TP53 gene, results from a T to G substitution at nucleotide position 436. The tryptophan at codon 146 is replaced by glycine, an amino acid with highly dissimilar properties. This variant is in the DNA binding domain of the TP53 protein and is reported to have non-functional transactivation in yeast based assays (Kato S et al. Proc. Natl. Acad. Sci. USA. 2003 Jul;100:8424-9). Studies conducted in human cell lines are equivocal about this variant's ability to suppress cell growth (Kotler E et al. Mol.Cell. 2018 Jul;71:178-190.e8; Giacomelli AO et al. Nat. Genet. 2018 Oct;50:1381-1387). This amino acid position is not well conserved in available vertebrate species. In addition, the in silico prediction for this alteration is inconclusive. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.55
BayesDel_addAF	Pathogenic	0.19	D
BayesDel_noAF	Uncertain	0.040
CADD	Benign	20
DANN	Benign	0.87
DEOGEN2	Uncertain	0.77	D;D;.;.;.;.;D;.;.;.;.;.;.;D;.;.;.;D;D;D
Eigen	Benign	-0.44
Eigen_PC	Benign	-0.60
FATHMM_MKL	Benign	0.27	N
LIST_S2	Benign	0.82	T;T;D;D;D;.;.;.;T;T;.;T;T;T;T;D;D;T;D;D
M_CAP	Pathogenic	0.54	D
MetaRNN	Uncertain	0.50	D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D
MetaSVM	Pathogenic	1.0	D
MutationAssessor	Uncertain	2.5	.;.;.;.;.;.;M;.;M;M;M;.;.;M;.;.;.;.;.;.
PhyloP100		1.1
PrimateAI	Benign	0.45	T
PROVEAN	Benign	-2.1	N;N;.;.;.;.;N;.;.;N;N;.;.;N;.;.;N;D;D;.
REVEL	Uncertain	0.54
Sift	Benign	0.10	T;T;.;.;.;.;T;.;.;T;T;.;.;T;.;.;T;T;D;.
Sift4G	Benign	0.12	T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;.;.;T
Polyphen		0.93	P;.;.;.;.;.;B;.;P;B;P;.;.;B;.;.;.;B;.;.
Vest4		0.47
MutPred		0.61		Gain of disorder (P = 0.0062);Gain of disorder (P = 0.0062);.;.;.;.;Gain of disorder (P = 0.0062);.;Gain of disorder (P = 0.0062);Gain of disorder (P = 0.0062);Gain of disorder (P = 0.0062);.;.;Gain of disorder (P = 0.0062);.;.;.;.;Gain of disorder (P = 0.0062);.;
MVP		0.97
MPC		2.1
ClinPred		0.59	D
GERP RS		0.44
PromoterAI		0.0065	Neutral
Varity_R		0.74
gMVP		0.53

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: rs786203064; hg19: chr17-7578494; COSMIC: COSV52726362;