17-7670700-G-T

Position:

• chr17-7670700-G-T

Variant summary

Our verdict is Likely pathogenic. Variant got 8 ACMG points: 8P and 0B. PM1 PM2 PM5 PP3_Moderate

The NM_000546.6(TP53):​c.1009C>A​(p.Arg337Ser) 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. R337C) has been classified as Pathogenic.

• Frequency: Genomes: not found (cov: 32)
• Consequence: TP53 NM_000546.6 missense
• Clinical Significance: Uncertain significance reviewed by expert panel U:2
• Conservation: PhyloP100: 0.877

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 Likely_pathogenic. Variant got 8 ACMG points.

• PM1: In a region_of_interest Interaction with HIPK1 (size 270) in uniprot entity P53_HUMAN there are 62 pathogenic changes around while only 6 benign (91%) in NM_000546.6
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr17-7670700-G-A is described in Lovd as [Pathogenic].
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.868

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
TP53	NM_000546.6	c.1009C>A	p.Arg337Ser	missense_variant	10/11	ENST00000269305.9	NP_000537.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
TP53	ENST00000269305.9	c.1009C>A	p.Arg337Ser	missense_variant	10/11	1	NM_000546.6	ENSP00000269305.4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: reviewed by expert panel

Submissions by phenotype

Li-Fraumeni syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Oct 23, 2021

This sequence change replaces arginine, which is basic and polar, with serine, which is neutral and polar, at codon 337 of the TP53 protein (p.Arg337Ser). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individual(s) with clinical features of Li-Fraumeni syndrome (LFS) (Invitae). ClinVar contains an entry for this variant (Variation ID: 1019612). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt TP53 protein function. Experimental studies have shown that this missense change affects TP53 function (PMID: 12826609, 12917626, 16007150, 29979965, 30224644). 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. -

Li-Fraumeni syndrome 1 Uncertain:1

Uncertain significance, reviewed by expert panel

curation

ClinGen TP53 Variant Curation Expert Panel, ClinGen

Jun 03, 2021

This variant is absent in the gnomAD cohort (PM2_Supporting; http://gnomad.broadinstitute.org). Transactivation assays show a low functioning allele according to Kato, et al. and there is loss of tetramer formation per Kawaguchi, et al. (PS3; PMID: 12826609, PMID: 16007150). In summary, the clinical significance of TP53 c.1009C>A (p.Arg337Ser) is uncertain for Li-Fraumeni syndrome. ACMG/AMP criteria applied, as specified by the TP53 Variant Curation Expert Panel: PM2_Supporting, PS3. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.98
BayesDel_addAF	Pathogenic	0.27	D
BayesDel_noAF	Pathogenic	0.15
CADD	Benign	22
DANN	Uncertain	0.99
DEOGEN2	Pathogenic	0.96	.;.;.;D;.;D;.;.
Eigen	Benign	0.11
Eigen_PC	Benign	-0.080
FATHMM_MKL	Benign	0.58	D
LIST_S2	Uncertain	0.96	D;D;.;.;.;D;D;D
M_CAP	Pathogenic	0.43	D
MetaRNN	Pathogenic	0.87	D;D;D;D;D;D;D;D
MetaSVM	Pathogenic	1.0	D
MutationAssessor	Pathogenic	3.0	.;.;.;M;.;M;.;.
PrimateAI	Benign	0.44	T
PROVEAN	Uncertain	-2.6	.;.;.;D;.;D;.;.
REVEL	Pathogenic	0.72
Sift	Uncertain	0.0060	.;.;.;D;.;D;.;.
Sift4G	Uncertain	0.060	T;T;D;D;D;D;D;D
Polyphen		0.99	.;.;.;D;.;D;.;.
Vest4		0.66
MutPred		0.73		.;.;.;Gain of phosphorylation at R337 (P = 0.0153);.;Gain of phosphorylation at R337 (P = 0.0153);.;.;
MVP		0.92
MPC		0.37
ClinPred		0.91	D
GERP RS		3.4
RBP_binding_hub_radar		0.97
RBP_regulation_power_radar		2.3
Varity_R		0.98
gMVP		0.72

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: rs587782529; hg19: chr17-7574018; COSMIC: COSV52718762; COSMIC: COSV52718762;