rs11575996

Positions:

• chr17-7673535-C-A
• chr17-7673535-C-G
• chr17-7673535-C-T

Variant summary

Our verdict is Likely pathogenic. Variant got 8 ACMG points: 8P and 0B. PM1 PM2 PP3_Strong

The NM_000546.6(TP53):​c.993G>T​(p.Gln331His) variant causes a missense, splice region change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. 3/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Uncertain significance (★). Another nucleotide change resulting in same amino acid change has been previously reported as Uncertain significancein ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. Q331R) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 31)
• Consequence: TP53 NM_000546.6 missense, splice_region
• Scores: Splicing: ADA: 1.000
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 3.38

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 8 ACMG points.

• PM1: In a hotspot region, there are 4 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 8 benign, 15 uncertain in NM_000546.6
• PM2: Very rare variant in population databases, with high coverage
• PP3: Splicing scoreres supports a deletorius effect: Scorers claiming Pathogenic: dbscSNV1_ADA, dbscSNV1_RF, max_spliceai. No scorers claiming Uncertain. No scorers claiming Benign.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
TP53	NM_000546.6	c.993G>T	p.Gln331His	missense_variant, splice_region_variant	9/11	ENST00000269305.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
TP53	ENST00000269305.9	c.993G>T	p.Gln331His	missense_variant, splice_region_variant	9/11	1	NM_000546.6	P1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 31

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

Jan 29, 2023

This variant is not present in population databases (gnomAD no frequency). 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. This variant disrupts the c.993G nucleotide in the TP53 gene. Other variant(s) that disrupt this nucleotide have been determined to be pathogenic (PMID: 22653678, 29324801, 33674644). This suggests that this nucleotide is clinically significant, and that variants that disrupt this position are likely to be disease-causing. Variants that disrupt the consensus splice site are a relatively common cause of aberrant splicing (PMID: 17576681, 9536098). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may disrupt the consensus splice site. Experimental studies have shown that this missense change does not substantially affect TP53 function (PMID: 12826609, 19454241). Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0"). This variant has not been reported in the literature in individuals affected with TP53-related conditions. This sequence change replaces glutamine, which is neutral and polar, with histidine, which is basic and polar, at codon 331 of the TP53 protein (p.Gln331His). This variant also falls at the last nucleotide of exon 9, which is part of the consensus splice site for this exon. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.40
BayesDel_addAF	Pathogenic	0.22	D
BayesDel_noAF	Uncertain	0.080
CADD	Pathogenic	33
DANN	Uncertain	0.99
DEOGEN2	Benign	0.029	T;.;.;.;.;T;T;.;D;.;.;.;.;.;.;D;.;.;.
Eigen	Uncertain	0.55
Eigen_PC	Uncertain	0.53
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Benign	0.34	T;T;T;D;D;T;T;.;.;.;T;T;.;T;T;D;D;T;D
M_CAP	Benign	0.075	D
MetaRNN	Uncertain	0.47	T;D;D;T;T;D;D;T;T;T;D;D;D;D;D;T;T;T;D
MetaSVM	Benign	-0.80	T
MutationAssessor	Benign	1.8	.;.;.;.;.;.;.;.;L;.;L;L;L;.;.;L;.;.;.
MutationTaster	Benign	0.86	D;D;D;D;D;D
PrimateAI	Benign	0.45	T
PROVEAN	Benign	-1.6	N;.;.;.;.;.;.;.;N;.;.;N;N;.;.;N;.;.;N
REVEL	Uncertain	0.58
Sift	Uncertain	0.013	D;.;.;.;.;.;.;.;T;.;.;D;D;.;.;T;.;.;D
Sift4G	Uncertain	0.015	D;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;D
Polyphen		0.026, 0.11, 0.013	.;.;.;.;.;.;.;.;B;.;B;B;B;.;.;B;.;.;.
Vest4		0.38
MutPred		0.42		Gain of methylation at R333 (P = 0.0465);.;.;.;.;.;.;.;Gain of methylation at R333 (P = 0.0465);.;Gain of methylation at R333 (P = 0.0465);Gain of methylation at R333 (P = 0.0465);Gain of methylation at R333 (P = 0.0465);.;.;Gain of methylation at R333 (P = 0.0465);.;.;.;
MVP		0.88
MPC		0.067
ClinPred		0.73	D
GERP RS		5.0
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		2.8
Varity_R		0.55
gMVP		0.48

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	1.0
dbscSNV1_RF	Pathogenic	1.0
SpliceAI score (max)		0.62		Details are displayed if max score is > 0.2
DS_DL_spliceai		0.62		Position offset: 0

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs11575996; hg19: chr17-7576853; COSMIC: COSV52690011; COSMIC: COSV52690011;