17-7674957-G-A

Position:

• chr17-7674957-G-A

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_000546.6(TP53):​c.574C>T​(p.Gln192Ter) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★★). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 33)
• Consequence: TP53 NM_000546.6 stop_gained
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:7 O:1
• Conservation: PhyloP100: 3.13

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 Pathogenic. Variant got 18 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 17-7674957-G-A is Pathogenic according to our data. Variant chr17-7674957-G-A is described in ClinVar as [Pathogenic]. Clinvar id is 406579.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr17-7674957-G-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
TP53	NM_000546.6	c.574C>T	p.Gln192Ter	stop_gained	6/11	ENST00000269305.9	NP_000537.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
TP53	ENST00000269305.9	c.574C>T	p.Gln192Ter	stop_gained	6/11	1	NM_000546.6	ENSP00000269305	P1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 35

GnomAD4 genome Cov.: 33

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:7 Other:1

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Li-Fraumeni syndrome 1 Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	Genome-Nilou Lab	Jun 18, 2022	- -
Pathogenic, criteria provided, single submitter	clinical testing	Myriad Genetics, Inc.	Feb 15, 2024	This variant is considered pathogenic. This variant creates a termination codon and is predicted to result in premature protein truncation. -

Hereditary cancer-predisposing syndrome Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	Ambry Genetics	Oct 10, 2019	The p.Q192* pathogenic mutation (also known as c.574C>T), located in coding exon 5 of the TP53 gene, results from a C to T substitution at nucleotide position 574. This changes the amino acid from a glutamine to a stop codon within coding exon 5. This alteration is expected to result in loss of function by premature protein truncation or nonsense-mediated mRNA decay. As such, this alteration is interpreted as a disease-causing mutation. -
Pathogenic, criteria provided, single submitter	clinical testing	Genome-Nilou Lab	Jun 18, 2022	- -

Li-Fraumeni syndrome Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Aug 09, 2022

For these reasons, this variant has been classified as Pathogenic. ClinVar contains an entry for this variant (Variation ID: 406579). This variant has not been reported in the literature in individuals affected with TP53-related conditions. This variant is not present in population databases (gnomAD no frequency). This sequence change creates a premature translational stop signal (p.Gln192*) in the TP53 gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in TP53 are known to be pathogenic (PMID: 20522432). -

Adrenal cortex carcinoma Pathogenic:1

Likely pathogenic, no assertion criteria provided

clinical testing

Key Laboratory of Carcinogenesis and Cancer Invasion, Central South University

-

- -

Malignant tumor of breast Pathogenic:1

Pathogenic, no assertion criteria provided

clinical testing

Department of Pathology and Laboratory Medicine, Sinai Health System

-

The TP53 p.Gln192* variant was identified in 7 of 6776 proband chromosomes (frequency: 0.001) from individuals or families with lung cancer, breast cancer, multiple myeloma, high-grade serous carcinoma or acute myeloid leukemia (Chin 2017, Fernandez-Cuesta 2012, Lee 2010, Ritterhouse 2016, Umemura 2014, Yanada 2016). The variant was also identified in dbSNP (ID: rs866380588) as "With Pathogenic allele", ClinVar (classified as pathogenic by Invitae), Cosmic (133x in breast, ovary, lung, urinary tract or oesophagus tissue), and in the IARC TP53(4x) database. The variant was not identified in COGR or LOVD 3.0, the 1000 Genomes Project, the NHLBI GO Exome Sequencing Project, the Exome Aggregation Consortium (August 8th 2016), or the Genome Aggregation Database (Feb 27, 2017). The c.574C>T variant leads to a premature stop codon at position 192 which is predicted to lead to a truncated or absent protein and loss of function. Loss of function variants of the TP53 gene are an established mechanism of disease in Li-Fraumeni syndrome and is the type of variant expected to cause the disorder. One study identified that the variant was found in patient’s primary lesions with metastatic relapse in breast and lung metastatic sites (Nigro 2012). A functional study of rescue of nonsense variants in TP53 identified that aminoglycosides can restore the transcriptional activity to TP53 and production of full-length p53 proteins from a cell line with this variant (Floquet 2010). In summary, based on the above information this variant meets our laboratory’s criteria to be classified as pathogenic. -

Neoplasm Other:1

-, criteria provided, single submitter

clinical testing

Center for Genomic Medicine, Rigshospitalet, Copenhagen University Hospital

Jul 31, 2024

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Pathogenic	0.60
CADD	Pathogenic	41
DANN	Uncertain	0.99
Eigen	Pathogenic	0.69
Eigen_PC	Uncertain	0.46
FATHMM_MKL	Uncertain	0.93	D
MutationTaster	Benign	1.0	A;A;A;A;A;A
Vest4		0.90
GERP RS		3.4

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: rs866380588; hg19: chr17-7578275; COSMIC: COSV52660737; COSMIC: COSV52660737;