GeneBe

chr17-7673802-C-T

Variant names:

Variant summary

Our verdict is Pathogenic. The variant received 18 ACMG points: 18P and 0B. PM2_SupportingPS3PS2PS4PM1PP3PP4_Moderate

This summary comes from the ClinGen Evidence Repository: The NM_000546.6: c.818G>A variant in TP53 is a missense variant predicted to cause substitution of arginine by histidine at amino acid 273 (p.R273H). This variant has been reported in numerous unrelated probands meeting Classic LFS and Revised Chompret criteria. Based on this evidence, this variant scores 8 total points meeting the TP53 VCEP phenotype scoring criteria of ≥ 8 points. (PS4_Very Strong; PMIDs, 16401470, 15390294, 9242456, 10864200, 1565144, 7732013; SCV000186052.8). This variant has been identified as a de novo occurrence with confirmed parental relationships in 1 individual with an LFS-associated cancer totaling 4 phenotype points (PS2; PMID:1267231). At least two individuals with this variant were found to have a variant allele fraction of 5-25%, which is a significant predictor of variant pathogenicity (PP4_Moderate, PMID:34906512, SCV000186052.8). This variant has an allele frequency of 0.00001186 (14/1179946 alleles) in the European (non-Finnish) population in gnomAD v4.1.0 which is lower than the Clingen TP53 VCEP threshold (<0.00004) for PM2_Supporting, and therefore meets this criterion (PM2_Supporting). In vitro assays performed in yeast and/or human cell lines showed non-functional transactivation and loss of growth suppression activity indicating that this variant impacts protein function (PS3; PMIDs: 12826609, 30224644, 29979965). This variant resides within a codon (NM_00546.4: 273) of TP53 that is defined as a mutational hotspot by the ClinGen TP53 VCEP (PM1; PMID:8023157 ). Computational predictor scores (BayesDel = 0.52; Align GVGD = Class 25) 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). 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_Very Strong, PS2, PM2_Supporting, PS3, PP4_Moderate, PM1, PP3. (Bayesian Points: 22; VCEP specifications version 2.0; 7/24/2024). LINK:https://erepo.genome.network/evrepo/ui/classification/CA000434/MONDO:0018875/009

Frequency

Genomes: 𝑓 0.000020 ( 0 hom., cov: 31)
Exomes 𝑓: 0.000010 ( 0 hom. )

Consequence

TP53
NM_000546.6 missense

Scores

10
8

Clinical Significance

Pathogenic reviewed by expert panel P:42O:6

Conservation

PhyloP100: 7.91

Publications

2932 publications found
Variant links:
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: Labcorp Genetics (formerly Invitae), G2P, ClinGen, 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

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ACMG classification

Classification was made for transcript

Our verdict: Pathogenic. The variant received 18 ACMG points.

PS2
For more information check the summary or visit ClinGen Evidence Repository.
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.
PP3
For more information check the summary or visit ClinGen Evidence Repository.
PP4
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.
GeneTranscriptTagsHGVScHGVSpEffectExon RankProteinUniProt
TP53
NM_000546.6
MANE Select
c.818G>Ap.Arg273His
missense
Exon 8 of 11NP_000537.3
TP53
NM_001126112.3
c.818G>Ap.Arg273His
missense
Exon 8 of 11NP_001119584.1
TP53
NM_001407262.1
c.818G>Ap.Arg273His
missense
Exon 9 of 12NP_001394191.1

Ensembl Transcripts

Sel.
GeneTranscriptTagsHGVScHGVSpEffectExon RankProteinUniProt
TP53
ENST00000269305.9
TSL:1 MANE Select
c.818G>Ap.Arg273His
missense
Exon 8 of 11ENSP00000269305.4
TP53
ENST00000445888.6
TSL:1
c.818G>Ap.Arg273His
missense
Exon 8 of 11ENSP00000391478.2
TP53
ENST00000610292.4
TSL:1
c.701G>Ap.Arg234His
missense
Exon 7 of 10ENSP00000478219.1

Frequencies

GnomAD3 genomes
AF:
0.0000197
AC:
3
AN:
152054
Hom.:
0
Cov.:
31
show subpopulations
Gnomad AFR
AF:
0.0000241
Gnomad AMI
AF:
0.00
Gnomad AMR
AF:
0.00
Gnomad ASJ
AF:
0.00
Gnomad EAS
AF:
0.00
Gnomad SAS
AF:
0.00
Gnomad FIN
AF:
0.00
Gnomad MID
AF:
0.00
Gnomad NFE
AF:
0.0000294
Gnomad OTH
AF:
0.00
GnomAD2 exomes
AF:
0.0000159
AC:
4
AN:
251054
AF XY:
0.0000221
show subpopulations
Gnomad AFR exome
AF:
0.00
Gnomad AMR exome
AF:
0.00
Gnomad ASJ exome
AF:
0.0000993
Gnomad EAS exome
AF:
0.00
Gnomad FIN exome
AF:
0.00
Gnomad NFE exome
AF:
0.0000264
Gnomad OTH exome
AF:
0.00
GnomAD4 exome
AF:
0.0000103
AC:
15
AN:
1461770
Hom.:
0
Cov.:
33
AF XY:
0.0000151
AC XY:
11
AN XY:
727180
show subpopulations
⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.
African (AFR)
AF:
0.00
AC:
0
AN:
33476
American (AMR)
AF:
0.00
AC:
0
AN:
44702
Ashkenazi Jewish (ASJ)
AF:
0.0000765
AC:
2
AN:
26134
East Asian (EAS)
AF:
0.00
AC:
0
AN:
39696
South Asian (SAS)
AF:
0.0000116
AC:
1
AN:
86246
European-Finnish (FIN)
AF:
0.00
AC:
0
AN:
53412
Middle Eastern (MID)
AF:
0.00
AC:
0
AN:
5768
European-Non Finnish (NFE)
AF:
0.0000108
AC:
12
AN:
1111940
Other (OTH)
AF:
0.00
AC:
0
AN:
60396
⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.0000240625), which strongly suggests a high chance of mosaicism in these individuals.
Allele Balance Distribution
Red line indicates average allele balance
Average allele balance: 0.358
Heterozygous variant carriers
0
1
2
3
4
5
0.00
0.20
0.40
0.60
0.80
0.95
Allele balance

Age Distribution

Exome Het
Variant carriers
0
2
4
6
8
10
<30
30-35
35-40
40-45
45-50
50-55
55-60
60-65
65-70
70-75
75-80
>80
Age
GnomAD4 genome
AF:
0.0000197
AC:
3
AN:
152172
Hom.:
0
Cov.:
31
AF XY:
0.0000269
AC XY:
2
AN XY:
74410
show subpopulations
⚠️ The allele balance in gnomAD version 4 Genomes is significantly skewed from the expected value of 0.5.
African (AFR)
AF:
0.0000241
AC:
1
AN:
41536
American (AMR)
AF:
0.00
AC:
0
AN:
15266
Ashkenazi Jewish (ASJ)
AF:
0.00
AC:
0
AN:
3468
East Asian (EAS)
AF:
0.00
AC:
0
AN:
5160
South Asian (SAS)
AF:
0.00
AC:
0
AN:
4820
European-Finnish (FIN)
AF:
0.00
AC:
0
AN:
10604
Middle Eastern (MID)
AF:
0.00
AC:
0
AN:
294
European-Non Finnish (NFE)
AF:
0.0000294
AC:
2
AN:
68006
Other (OTH)
AF:
0.00
AC:
0
AN:
2106
⚠️ The allele balance in gnomAD version 4 Genomes is significantly skewed from the expected value of 0.5. (p-value = 0.00000000359607), which strongly suggests a high chance of mosaicism in these individuals.
Allele Balance Distribution
Red line indicates average allele balance
Average allele balance: 0.292
Heterozygous variant carriers
0
0
1
1
2
2
0.00
0.20
0.40
0.60
0.80
0.95
Allele balance

Age Distribution

Genome Het
Variant carriers
0
2
4
6
8
10
<30
30-35
35-40
40-45
45-50
50-55
55-60
60-65
65-70
70-75
75-80
>80
Age
Alfa
AF:
0.0000479
Hom.:
0
ExAC
AF:
0.0000247
AC:
3

ClinVar

ClinVar submissions as Germline
Significance:Pathogenic
Revision:reviewed by expert panel
View on ClinVar

Computational scores

Publications

Other links and lift over

dbSNP: rs28934576; hg19: chr17-7577120; COSMIC: COSV52660980; COSMIC: COSV52660980; API