17-7676005-C-T

Variant names:

• chr17-7676005-C-T
• rs587781495
• NM_000546.6:c.364G>A

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 1P and 3B. BS2_Supporting BP4 BS3_Supporting PM2_Supporting

This summary comes from the ClinGen Evidence Repository: The NM_000546.6: c.364G>A variant in TP53 is a missense variant predicted to cause substitution of valine by methionine at amino acid 122 (p.Val122Met). This variant has been observed in 2-3 heterozygous unrelated females from the same data source with no personal history of cancer prior to age 60 years and no personal history of sarcoma at any age (BS2_Supporting; Internal lab contributor: Invitae). This variant has an allele frequency of 0.000001695 (2/1180034 alleles) in the European (non-Finnish) population in gnomAD v4.1.0 which is lower than the Clingen TP53 VCEP threshold (<0.00004) for PM2_Supporting, and therefore meets this criterion (PM2_Supporting). In vitro assays performed in yeast and/or human cell lines showed partially functional transactivation and retained growth suppression activity indicating that this variant does not impact protein function (BS3_Supporting; PMIDs: 12826609, 29979965, 30224644). Computational predictor score (BayesDel = 0.134118) is below the recommended threshold (BayesDel < 0.16), 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 Likely Benign for Li Fraumeni syndrome based on the ACMG/AMP criteria applied, as specified by the ClinGen TP53 VCEP: BS2_Supporting, PM2_Supporting, BS3_Supporting, BP4. (Bayesian Points: -2; VCEP specifications version 2.1; 1/16/2025). LINK:https://erepo.genome.network/evrepo/ui/classification/CA000134/MONDO:0018875/009

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: TP53 NM_000546.6 missense
• Clinical Significance: Likely benign reviewed by expert panel U:3 B:2
• Conservation: PhyloP100: 4.72

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]

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• PM2: For more information check the summary or visit ClinGen Evidence Repository.
• BP4: For more information check the summary or visit ClinGen Evidence Repository.
• BS2: For more information check the summary or visit ClinGen Evidence Repository.
• BS3: 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.364G>A	p.Val122Met	missense_variant	Exon 4 of 11	ENST00000269305.9	NP_000537.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TP53	ENST00000269305.9	c.364G>A	p.Val122Met	missense_variant	Exon 4 of 11	1	NM_000546.6	ENSP00000269305.4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1459964 Hom.: 0 Cov.: 31 AF XY: 0.00000275 AC XY: 2 AN XY: 726272

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: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000180

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Likely benign

Submissions summary: Uncertain:3 Benign:2

Revision: reviewed by expert panel

Submissions by phenotype

Li-Fraumeni syndrome Uncertain:1 Benign:1

Jan 16, 2025

ClinGen TP53 Variant Curation Expert Panel, ClinGen

Significance: Likely benign

Review Status: reviewed by expert panel

Collection Method: curation

The NM_000546.6: c.364G>A variant in TP53 is a missense variant predicted to cause substitution of valine by methionine at amino acid 122 (p.Val122Met). This variant has been observed in 2-3 heterozygous unrelated females from the same data source with no personal history of cancer prior to age 60 years and no personal history of sarcoma at any age (BS2_Supporting; Internal lab contributor: Invitae). This variant has an allele frequency of 0.000001695 (2/1180034 alleles) in the European (non-Finnish) population in gnomAD v4.1.0 which is lower than the Clingen TP53 VCEP threshold (<0.00004) for PM2_Supporting, and therefore meets this criterion (PM2_Supporting). In vitro assays performed in yeast and/or human cell lines showed partially functional transactivation and retained growth suppression activity indicating that this variant does not impact protein function (BS3_Supporting; PMIDs: 12826609, 29979965, 30224644). Computational predictor score (BayesDel = 0.134118) is below the recommended threshold (BayesDel < 0.16), 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 Likely Benign for Li Fraumeni syndrome based on the ACMG/AMP criteria applied, as specified by the ClinGen TP53 VCEP: BS2_Supporting, PM2_Supporting, BS3_Supporting, BP4. (Bayesian Points: -2; VCEP specifications version 2.1; 1/16/2025). -

Dec 12, 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 methionine, which is neutral and non-polar, at codon 122 of the TP53 protein (p.Val122Met). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with TP53-related conditions. ClinVar contains an entry for this variant (Variation ID: 141101). Invitae Evidence Modeling incorporating data from in vitro experimental studies (PMID: 12826609, 29979965, 30224644) indicates that this missense variant is expected to disrupt TP53 function with a positive predictive value of 97.5%. Experimental studies have shown that this missense change does not substantially affect TP53 function (PMID: 12826609, 15781620, 29979965). 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. -

Hereditary cancer-predisposing syndrome Uncertain:1 Benign:1

May 26, 2022

Ambry Genetics

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This alteration is classified as likely benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -

Aug 31, 2018

Color Diagnostics, LLC DBA Color Health

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

not specified Uncertain:1

-

Mayo Clinic Laboratories, Mayo Clinic

Significance: Uncertain significance

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.83
BayesDel_addAF	Pathogenic	0.26	D
BayesDel_noAF	Uncertain	0.13
CADD	Uncertain	24
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.66	D;D;.;D;.;.;.;.;.;.;D;.;D;D;.
Eigen	Uncertain	0.56
Eigen_PC	Uncertain	0.56
FATHMM_MKL	Pathogenic	0.97	D
LIST_S2	Benign	0.83	T;T;.;.;.;T;T;.;T;T;T;T;T;T;D
M_CAP	Pathogenic	0.59	D
MetaRNN	Pathogenic	0.92	D;D;D;D;D;D;D;D;D;D;D;D;D;D;D
MetaSVM	Pathogenic	0.99	D
MutationAssessor	Pathogenic	3.0	.;.;.;M;.;M;M;M;.;.;M;.;.;.;.
PrimateAI	Uncertain	0.68	T
PROVEAN	Benign	-1.9	N;N;.;N;.;.;N;N;.;.;N;.;N;.;N
REVEL	Pathogenic	0.77
Sift	Uncertain	0.011	D;D;.;D;.;.;D;D;.;.;D;.;D;.;D
Sift4G	Uncertain	0.0050	D;D;D;D;D;D;D;D;D;D;D;D;.;D;.
Polyphen		0.69	P;.;.;D;.;D;B;D;.;.;D;.;P;.;.
Vest4		0.28
MutPred		0.81		Gain of catalytic residue at V122 (P = 0.0593);Gain of catalytic residue at V122 (P = 0.0593);.;Gain of catalytic residue at V122 (P = 0.0593);.;Gain of catalytic residue at V122 (P = 0.0593);Gain of catalytic residue at V122 (P = 0.0593);Gain of catalytic residue at V122 (P = 0.0593);.;.;Gain of catalytic residue at V122 (P = 0.0593);.;Gain of catalytic residue at V122 (P = 0.0593);Gain of catalytic residue at V122 (P = 0.0593);Gain of catalytic residue at V122 (P = 0.0593);
MVP		0.94
MPC		1.7
ClinPred		0.97	D
GERP RS		4.8
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.86
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

Publications

LitVar

Other links and lift over

dbSNP: rs587781495; hg19: chr17-7579323;