17-7676137-C-A

Position:

• chr17-7676137-C-A

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_000546.6(TP53):​c.232G>T​(p.Ala78Ser) 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 Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A78G) 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: -0.514

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 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.11620441).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
TP53	NM_000546.6	c.232G>T	p.Ala78Ser	missense_variant	4/11	ENST00000269305.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
TP53	ENST00000269305.9	c.232G>T	p.Ala78Ser	missense_variant	4/11	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

Invitae

Apr 17, 2019

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. An experimental study in yeast has shown that this variant does not impair the transcriptional transactivation activity of the TP53 protein (PMID: 12826609). This variant has not been reported in the literature in individuals with TP53-related conditions. This variant is not present in population databases (ExAC no frequency). This sequence change replaces alanine with serine at codon 78 of the TP53 protein (p.Ala78Ser). The alanine residue is weakly conserved and there is a moderate physicochemical difference between alanine and serine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.084
BayesDel_addAF	Uncertain	0.052	T
BayesDel_noAF	Benign	-0.16
CADD	Benign	4.5
DANN	Benign	0.82
DEOGEN2	Benign	0.0085	T;T;.;D;.;.;.;.;.;.;D;.;.;T;T;.
Eigen	Benign	-0.99
Eigen_PC	Benign	-1.1
FATHMM_MKL	Benign	0.33	N
LIST_S2	Benign	0.56	T;T;.;.;.;T;T;.;D;D;T;D;T;T;T;T
M_CAP	Benign	0.073	D
MetaRNN	Benign	0.12	T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T
MetaSVM	Uncertain	0.65	D
MutationAssessor	Benign	1.9	.;.;.;L;.;L;L;L;.;.;L;.;.;.;.;.
MutationTaster	Benign	1.0	N;N;N;N;N;N
PrimateAI	Benign	0.45	T
PROVEAN	Benign	0.38	N;N;.;N;.;.;N;N;.;.;N;.;.;N;.;N
REVEL	Benign	0.27
Sift	Benign	0.15	T;T;.;T;.;.;T;T;.;.;T;.;.;T;.;T
Sift4G	Benign	0.72	T;T;T;T;T;T;T;T;T;T;T;T;T;.;T;.
Polyphen		0.28	B;.;.;B;.;B;B;B;.;.;B;.;.;B;.;.
Vest4		0.24
MutPred		0.18		Gain of glycosylation at A78 (P = 4e-04);Gain of glycosylation at A78 (P = 4e-04);.;Gain of glycosylation at A78 (P = 4e-04);.;Gain of glycosylation at A78 (P = 4e-04);Gain of glycosylation at A78 (P = 4e-04);Gain of glycosylation at A78 (P = 4e-04);.;.;Gain of glycosylation at A78 (P = 4e-04);.;Gain of glycosylation at A78 (P = 4e-04);Gain of glycosylation at A78 (P = 4e-04);Gain of glycosylation at A78 (P = 4e-04);Gain of glycosylation at A78 (P = 4e-04);
MVP		0.84
MPC		0.65
ClinPred		0.077	T
GERP RS		-0.37
Varity_R		0.20
gMVP		0.20

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: rs1555526673; hg19: chr17-7579455; COSMIC: COSV53136989; COSMIC: COSV53136989;