17-7670684-C-G

Variant names:

• chr17-7670684-C-G
• rs375338359
• NM_000546.6:c.1025G>C

Variant summary

Our verdict is Pathogenic. The variant received 13 ACMG points: 13P and 0B. PM2_Supporting PM1_Supporting PS4_Moderate PS3 PP1_Strong PP3

This summary comes from the ClinGen Evidence Repository: The NM_000546.6: c.1025G>C variant in TP53 is a missense variant predicted to cause substitution of arginine by proline at amino acid 342 (p.Arg342Pro). This variant has been reported in 3 unrelated families meeting Classic criteria. Based on this evidence, this variant scores 3 total points meeting the TP53 VCEP phenotype scoring criteria of 2-3.5 points. (PS4_Moderate; PMIDs 25981898, 25226867, 19714490). The variant has been reported to segregate with LFS-associated cancers in ≥ 7 meioses from 3 families (PP1_Strong; PMIDs 25981898, 25226867, 19714490). In vitro assays performed in yeast and/or human cell lines showed non-functional transactivation, loss of growth suppression activity, and impaired tetramer formation indicating that this variant impacts protein function (PS3; PMIDs: 12826609, 30224644, 16007150). This variant is absent from gnomAD v4.1.0 (PM2_Supporting). Computational predictor scores (BayesDel = 0.24; Align GVGD = Class C35) are above recommended thresholds (BayesDel > 0.16 and an Align GVGD Class of > 15), evidence that correlates with impact to TP53 via protein change (PP3). This variant has 8 somatic occurrences for the same amino acid change in cancerhotspots.org (v2) sufficient to be defined as a mutational hotspot by the Clingen TP53 VCEP (2-9 somatic occurrences, PMID:30311369) (PM1_Supporting). In summary, this variant meets the criteria to be classified as Pathogenic for Li Fraumeni syndrome based on the ACMG/AMP criteria applied, as specified by the ClinGen TP53 VCEP: PS4_Moderate, PP1_Strong, PS3, PM2_Supporting, PP3, PM1_Supporting. (Bayesian Points: 13; VCEP specifications version 2.0; 9/6/2024) LINK:https://erepo.genome.network/evrepo/ui/classification/CA337802/MONDO:0018875/009

• Frequency: Genomes: not found (cov: 32)
• Consequence: TP53 NM_000546.6 missense
• Clinical Significance: Pathogenic reviewed by expert panel P:9 O:1
• Conservation: PhyloP100: -0.406
• Publications: 142 publications found

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 Gene-Disease associations (from GenCC):

• breast cancer

  Inheritance: AD Classification: DEFINITIVE Submitted by: Ambry Genetics
• Li-Fraumeni syndrome

  Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: ClinGen, G2P, Labcorp Genetics (formerly Invitae), Orphanet
• Li-Fraumeni syndrome 1

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Ambry Genetics, Genomics England PanelApp
• adrenocortical carcinoma, hereditary

  Inheritance: AD Classification: STRONG Submitted by: Ambry Genetics
• sarcoma

  Inheritance: AD Classification: STRONG Submitted by: Genomics England PanelApp
• bone marrow failure syndrome 5

  Inheritance: AD Classification: MODERATE Submitted by: Ambry Genetics
• colorectal cancer

  Inheritance: AD Classification: MODERATE Submitted by: Ambry Genetics
• choroid plexus carcinoma

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Pathogenic. The variant received 13 ACMG points.

• PS3: For more information check the summary or visit ClinGen Evidence Repository.
• PS4: For more information check the summary or visit ClinGen Evidence Repository.
• PM1: For more information check the summary or visit ClinGen Evidence Repository.
• PM2: For more information check the summary or visit ClinGen Evidence Repository.
• PP1: For more information check the summary or visit ClinGen Evidence Repository.
• PP3: For more information check the summary or visit ClinGen Evidence Repository.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000546.6. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TP53	NM_000546.6	MANE Select	c.1025G>C	p.Arg342Pro	missense	Exon 10 of 11	NP_000537.3
	TP53	NM_001126112.3		c.1025G>C	p.Arg342Pro	missense	Exon 10 of 11	NP_001119584.1	K7PPA8
	TP53	NM_001407262.1		c.1025G>C	p.Arg342Pro	missense	Exon 11 of 12	NP_001394191.1	K7PPA8

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TP53	ENST00000269305.9	TSL:1 MANE Select	c.1025G>C	p.Arg342Pro	missense	Exon 10 of 11	ENSP00000269305.4	P04637-1
	TP53	ENST00000445888.6	TSL:1	c.1025G>C	p.Arg342Pro	missense	Exon 10 of 11	ENSP00000391478.2	P04637-1
	TP53	ENST00000610292.4	TSL:1	c.908G>C	p.Arg303Pro	missense	Exon 9 of 10	ENSP00000478219.1	P04637-4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

ClinVar submissions

Significance: Pathogenic

Revision: reviewed by expert panel

Pathogenic	VUS	Benign	Condition
3	-	-	Hereditary cancer-predisposing syndrome (3)
2	-	-	Li-Fraumeni syndrome (2)
2	-	-	Li-Fraumeni syndrome 1 (2)
1	-	-	not provided (1)
1	-	-	Ovarian neoplasm (1)
-	-	-	Diffuse glioma, H3 G34 mutant (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.98
BayesDel_addAF	Pathogenic	0.34	D
BayesDel_noAF	Pathogenic	0.25
CADD	Benign	20
DANN	Uncertain	0.99
DEOGEN2	Pathogenic	0.90	D
Eigen	Benign	-0.044
Eigen_PC	Benign	-0.20
FATHMM_MKL	Benign	0.19	N
LIST_S2	Uncertain	0.93	D
M_CAP	Uncertain	0.14	D
MetaRNN	Pathogenic	0.91	D
MetaSVM	Uncertain	0.20	D
MutationAssessor	Uncertain	2.4	M
PhyloP100		-0.41
PrimateAI	Benign	0.29	T
PROVEAN	Benign	-2.3	N
REVEL	Pathogenic	0.65
Sift	Benign	0.066	T
Sift4G	Benign	0.14	T
Polyphen		0.94	P
Vest4		0.58
MutPred		0.82		Loss of methylation at R342 (P = 0.0497)
MVP		0.98
MPC		0.40
ClinPred		0.86	D
GERP RS		2.4
Varity_R		0.97
gMVP		0.86
Mutation Taster		=10/90	disease causing (ClinVar)

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

Other links and lift over

dbSNP: rs375338359; hg19: chr17-7574002; COSMIC: COSV52690857; COSMIC: COSV52690857;