17-7670643-C-T

Variant names:

• chr17-7670643-C-T
• rs766786605
• NM_000546.6:c.1066G>A

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 4P and 3B. PM1 PM2 BP4_Moderate BP6

The NM_000546.6(TP53):​c.1066G>A​(p.Gly356Arg) 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 benign outcome for this variant. 15/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency: Genomes: not found (cov: 32)
• Consequence: TP53 NM_000546.6 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1 B:1
• Conservation: PhyloP100: 0.965

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 Uncertain_significance. Variant got 1 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
• BP4: Computational evidence support a benign effect (MetaRNN=0.10263893).
• BP6: Variant 17-7670643-C-T is Benign according to our data. Variant chr17-7670643-C-T is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 2774646.We mark this variant Likely_benign, oryginal submissions are: {Uncertain_significance=1, Likely_benign=1}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TP53	NM_000546.6	c.1066G>A	p.Gly356Arg	missense_variant	Exon 10 of 11	ENST00000269305.9	NP_000537.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TP53	ENST00000269305.9	c.1066G>A	p.Gly356Arg	missense_variant	Exon 10 of 11	1	NM_000546.6	ENSP00000269305.4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1 Benign:1

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Hereditary cancer-predisposing syndrome Uncertain:1 Benign:1

Dec 18, 2023

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. -

Jun 13, 2023

Color Diagnostics, LLC DBA Color Health

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This missense variant replaces glycine with arginine at codon 356 of the TP53 protein. Computational prediction suggests that this variant may not impact protein structure and function (internally defined REVEL score threshold <= 0.5, PMID: 27666373). Experimental studies have shown that this variant did not impact function in yeast transactivation assays (PMID: 12826609) and human cell growth suppression assays (PMID: 30224644). To our knowledge, this variant has not been reported in individuals affected with TP53-related disorders in the literature. This variant has not been identified in the general population by the Genome Aggregation Database (gnomAD). The available evidence is insufficient to determine the role of this variant in disease conclusively. Therefore, this variant is classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.12
BayesDel_addAF	Benign	-0.076	T
BayesDel_noAF	Benign	-0.35
CADD	Benign	17
DANN	Uncertain	0.98
DEOGEN2	Uncertain	0.64	.;.;.;D;.;D;.;.
Eigen	Benign	-0.67
Eigen_PC	Benign	-0.53
FATHMM_MKL	Benign	0.090	N
LIST_S2	Benign	0.74	T;T;.;.;.;T;T;T
M_CAP	Benign	0.024	T
MetaRNN	Benign	0.10	T;T;T;T;T;T;T;T
MetaSVM	Benign	-0.52	T
MutationAssessor	Benign	1.2	.;.;.;L;.;L;.;.
PrimateAI	Benign	0.32	T
PROVEAN	Benign	0.88	.;.;.;N;.;N;.;.
REVEL	Benign	0.14
Sift	Benign	0.29	.;.;.;T;.;T;.;.
Sift4G	Benign	0.52	T;T;T;T;T;T;T;T
Polyphen		0.014	.;.;.;B;.;B;.;.
Vest4		0.31
MutPred		0.31		.;.;.;Gain of MoRF binding (P = 0.0169);.;Gain of MoRF binding (P = 0.0169);.;.;
MVP		0.70
MPC		0.079
ClinPred		0.10	T
GERP RS		3.4
RBP_binding_hub_radar		0.97
RBP_regulation_power_radar		2.3
Varity_R		0.14
gMVP		0.35

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: rs766786605; hg19: chr17-7573961;