17-7670667-A-C

Position:

• chr17-7670667-A-C

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM1 PM2 PP3_Moderate

The NM_000546.6(TP53):​c.1042T>G​(p.Leu348Val) variant causes a missense 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 Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. L348S) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: TP53 NM_000546.6 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.551

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_pathogenic. Variant got 6 ACMG points.

• PM1: In a hotspot region, there are 4 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 11 benign, 15 uncertain in NM_000546.6
• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.91

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
TP53	NM_000546.6	c.1042T>G	p.Leu348Val	missense_variant	10/11	ENST00000269305.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
TP53	ENST00000269305.9	c.1042T>G	p.Leu348Val	missense_variant	10/11	1	NM_000546.6	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Li-Fraumeni syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Aug 04, 2021

In summary, this variant is a novel missense change that has been shown not to affect protein function. There is no indication that it causes disease, but the available evidence is currently insufficient to prove that conclusively. Therefore, it has been classified as a Variant of Uncertain Significance. Experimental studies have shown that this missense change does not disrupt the transcriptional transactivation function of the TP53 protein (PMID: 12826609). This variant is not present in population databases (ExAC no frequency) and has not been reported in the literature in individuals with a TP53-related disease. This sequence change replaces leucine with valine at codon 348 of the TP53 protein (p.Leu348Val). The leucine residue is highly conserved and there is a small physicochemical difference between leucine and valine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.44
BayesDel_addAF	Pathogenic	0.24	D
BayesDel_noAF	Uncertain	0.10
CADD	Benign	21
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.98	.;.;.;D;.;D;.;.
Eigen	Uncertain	0.26
Eigen_PC	Benign	0.15
FATHMM_MKL	Uncertain	0.94	D
LIST_S2	Uncertain	0.90	D;D;.;.;.;D;D;D
M_CAP	Pathogenic	0.51	D
MetaRNN	Pathogenic	0.91	D;D;D;D;D;D;D;D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Pathogenic	3.4	.;.;.;M;.;M;.;.
MutationTaster	Benign	0.99	D;D;D;D;D;D
PrimateAI	Uncertain	0.49	T
PROVEAN	Uncertain	-2.7	.;.;.;D;.;D;.;.
REVEL	Pathogenic	0.81
Sift	Uncertain	0.0010	.;.;.;D;.;D;.;.
Sift4G	Uncertain	0.0020	D;D;D;D;D;D;D;D
Polyphen		1.0	.;.;.;D;.;D;.;.
Vest4		0.62
MutPred		0.79		.;.;.;Loss of stability (P = 0.0688);.;Loss of stability (P = 0.0688);.;.;
MVP		0.98
MPC		0.39
ClinPred		0.97	D
GERP RS		1.9
RBP_binding_hub_radar		0.92
RBP_regulation_power_radar		2.2
Varity_R		0.96
gMVP		0.62

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: rs1060501193; hg19: chr17-7573985;