17-7674268-A-T

Position:

• chr17-7674268-A-T

Variant summary

Our verdict is Pathogenic. Variant got 16 ACMG points: 16P and 0B. PM1 PM2 PP3_Strong PP5_Very_Strong

The NM_000546.6(TP53):​c.695T>A​(p.Ile232Asn) variant causes a missense change involving the alteration of a 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 Likely pathogenic (★★).

• Frequency: Genomes: not found (cov: 30)
• Consequence: TP53 NM_000546.6 missense
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:2
• Conservation: PhyloP100: 9.30

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 (HGNC:):

ACMG classification

Verdict is Pathogenic. Variant got 16 ACMG points.

• PM1: In a region_of_interest Interaction with AXIN1 (size 176) in uniprot entity P53_HUMAN there are 53 pathogenic changes around while only 3 benign (95%) in NM_000546.6
• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.95
• PP5: Variant 17-7674268-A-T is Pathogenic according to our data. Variant chr17-7674268-A-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 850008.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
TP53	NM_000546.6	c.695T>A	p.Ile232Asn	missense_variant	7/11	ENST00000269305.9	NP_000537.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
TP53	ENST00000269305.9	c.695T>A	p.Ile232Asn	missense_variant	7/11	1	NM_000546.6	ENSP00000269305.4

Frequencies

GnomAD3 genomes Cov.: 30

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 30

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Li-Fraumeni syndrome Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Apr 10, 2020	For these reasons, this variant has been classified as Pathogenic. This variant has been reported to affect TP53 protein function (PMID: 12826609). This variant has been observed in individual(s) with clinical features of Li-Fraumeni syndrome (LFS) (Invitae). In at least one individual the variant was observed to be de novo. This variant is not present in population databases (ExAC no frequency). This sequence change replaces isoleucine with asparagine at codon 232 of the TP53 protein (p.Ile232Asn). The isoleucine residue is moderately conserved and there is a large physicochemical difference between isoleucine and asparagine. -
Likely pathogenic, criteria provided, single submitter	clinical testing	Genetics and Molecular Pathology, SA Pathology	Aug 23, 2021	The TP53 c.695T>A variant is classified as Likely Pathogenic (PS3, PM2, PP3) This variant is absent from population databases (PM2). Well-established functional studies show a deleterious effect of this variant ( IARC TP53 database indicates the variant results in a non-functional protein with respect to transactivation of downstream genes using the assay of (Kato et al., 2003 PMID: 12826609) ) (PS3). Variant occurs in the DNA binding domain, and demonstrates growth suppression. Computational predictions support a deleterious effect on the gene or gene product (PP3). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.99
BayesDel_addAF	Pathogenic	0.42	D
BayesDel_noAF	Pathogenic	0.37
CADD	Pathogenic	27
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.69	D;D;.;.;.;.;T;T;.;D;.;.;.;.;.;.;D;.;.;.;D
Eigen	Pathogenic	0.70
Eigen_PC	Pathogenic	0.67
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.88	D;D;D;D;D;D;D;D;.;.;.;D;D;.;D;D;D;D;D;D;D
M_CAP	Pathogenic	0.88	D
MetaRNN	Pathogenic	0.95	D;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	Benign	1.9	.;.;.;.;.;.;.;.;.;L;.;L;L;L;.;.;L;.;.;.;.
PrimateAI	Uncertain	0.56	T
PROVEAN	Pathogenic	-6.3	D;D;.;.;.;.;.;.;.;D;.;.;D;D;.;.;D;.;.;D;D
REVEL	Pathogenic	0.92
Sift	Pathogenic	0.0	D;T;.;.;.;.;.;.;.;T;.;.;T;T;.;.;T;.;.;D;D
Sift4G	Pathogenic	0.0	D;D;T;T;T;T;T;T;D;D;D;D;D;D;D;D;D;D;D;T;.
Polyphen		1.0	D;.;.;.;.;.;.;.;.;D;.;D;D;D;.;.;D;.;.;.;D
Vest4		0.93
MutPred		0.76		Gain of disorder (P = 0.0226);Gain of disorder (P = 0.0226);.;.;.;.;.;.;.;Gain of disorder (P = 0.0226);.;Gain of disorder (P = 0.0226);Gain of disorder (P = 0.0226);Gain of disorder (P = 0.0226);.;.;Gain of disorder (P = 0.0226);.;.;.;.;
MVP		0.95
MPC		2.2
ClinPred		1.0	D
GERP RS		4.6
Varity_R		0.92
gMVP		0.81

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: rs587781589; hg19: chr17-7577586; COSMIC: COSV52760307; COSMIC: COSV52760307;