About TP53
No gene-level summary was recorded for this case.
No variant summary was recorded for this case.
Five-step scale from benign to pathogenic. This variant is likely pathogenic. Select a step to read what it means.
Likely pathogenic.A likely pathogenic classification under the recorded framework.
Gene-level background from the recorded interpretation.
Words with a dotted underline have a short definition. Hover or tap them.No gene-level summary was recorded for this case.
The recorded framework is ClinGen TP53 VCEP v2.4.0. The criteria and strengths shown below come from the saved assessment; this page does not recalculate the classification.
The applied criteria and their strengths are shown as assessed under the stated framework.
N239S is classified as PS3 by the TP53 VCEP Functional-worksheet (Supplementary Table S3). In the Kato et al. (PMID:12826609) functional assay, N239S is non-functional. In the three other eligible VCEP assays, N239S shows loss of function: Giacomelli (PMID:30224644): LOF; Kotler (PMID:29979965): LOF; Funk (PMID:39774325): LOF. This meets the VCEP PS3_Strong criteria: non-functional on Kato data AND loss of function by the majority of other eligible assays (3/3 LOF).
The variant is extremely rare in population databases. In gnomAD v4.1, the global allele frequency is 6.20e-7 (1 allele / 1,613,892 alleles; 0.000062%), with the only allele observed in the European (non-Finnish) subpopulation (AF = 8.48e-7; 1/1,179,928 alleles). This is well below the VCEP PM2_Supporting threshold of <0.00003 (0.003%). The variant is absent from gnomAD v2.1 and gnomAD-Canada v1.0. No homozygotes observed.
At codon 239, at least three different missense variants (N239D, N239I, N239T) have been independently classified as PS3 (Pathogenic) by the TP53 VCEP Functional-worksheet. This satisfies PM5_Strong: ≥2 different missense variants at the same amino acid residue previously determined to be pathogenic per TP53 VCEP specifications.
Per the TP53 VCEP PP3-BP4-codes.xlsx (Supplementary Table S2), c.716A>G (p.Asn239Ser) is assigned BP4. The variant has BayesDel score 0.10537, which is <0.16 and >-0.008, with aGVGD Class C45 (not C65). SpliceAI max delta = 0.04, indicating no predicted splicing effect (<0.2). This meets the VCEP BP4_Supporting criteria: BayesDel <0.16 and >-0.008 (excluding C65) AND no predicted differences in splicing (SpliceAI <0.2).
Tavtigian et.al., 2020 - Bayesian adaptation of Richards et.al., 2015 v2.4.0 point-based framework: PS3 strong (+4) + PM2 supporting (+1) + PM5 strong (+4) + BP4 supporting benign (-1) = 8 points, which maps to Likely Pathogenic.
Evidence summaries and captured source records, where available. Missing entries should not be interpreted as negative findings.
gnomAD v4.1: 1 / 1,613,892 alleles. Recorded AF 6.1962e-07. Recorded homozygote count 0.
Absent from gnomAD v2.1.
Absent from gnomAD-Canada v1.0.
Recorded SpliceAI maximum delta score: 0.040. Refer to the recorded PP3/BP4 rationale for interpretation.
6 Likely pathogenic · 1 Pathogenic.
OncoKB identified variant-specific curated literature and context relevant to functional review; biological-effect context: Loss-of-function; curated oncogenicity label: Oncogenic.
This variant has previously been reported in somatic cancers (COSMIC; COSV52661127, n = 56 times).
This variant lies in a statistically significant hotspot.
ACMG/AMP criteria under ClinGen TP53 VCEP v2.4.0, with the data and sources behind each one.
27 criteria with recorded statuses: 4 met · 5 not met · 6 not assessed · 12 not applicable. Open any row for the full reasoning, the rule and the evidence behind it.
PS3_Strong is met (+4 points): N239S is non-functional in the Kato et al. functional assay and shows loss of function in all three other eligible VCEP assays (Giacomelli, Kotler, Funk), meeting the TP53 VCEP criterion for strong pathogenic functional evidence.
PM5_Strong is met (+4 points): At codon 239, three different missense variants (N239D, N239I, N239T) have been classified as pathogenic (PS3) by the TP53 VCEP, satisfying the requirement of ≥2 different pathogenic missense variants at the same residue.
PM2_Supporting is met (+1 point): The variant is extremely rare in population databases (gnomAD v4.1 AF = 6.2e-7), well below the VCEP threshold of <0.00003.
BP4_Supporting is met (-1 point): Per the VCEP PP3-BP4-codes.xlsx, c.716A>G is assigned BP4. BayesDel score 0.10537 with aGVGD Class C45 and no predicted splicing impact (SpliceAI 0.04).
Tavtigian point total: 4 (PS3) + 4 (PM5) + 1 (PM2) - 1 (BP4) = 8 points. Under the TP53 VCEP v2.4.0 point-based framework, 6-9 points corresponds to Likely Pathogenic.
The variant has been observed in ClinVar with majority classification as Likely Pathogenic (6 clinical laboratories) and Pathogenic (1 laboratory), consistent with this adjudication.
N239S has been reported as a somatic mutation in 56 tumor samples in COSMIC and is classified as Oncogenic (Loss-of-function) by OncoKB, though these somatic data are not directly used for germline criterion points under the VCEP framework.
No criteria match.
No further detail was recorded.
No further detail was recorded.
Every interpreted variant in TP53, mapped onto the exon structure of NM_000546.6. Select a row to find it on the plot.
| Protein | Location | Classification | Link |
|---|
| European (non-Finnish)1 / 1,179,928 | 8.5e-07 |
This variant is present in gnomAD v4.1 (AF= 6.1962e-07; MAF= 0.00006%, 1/1613892 alleles, homozygotes = 0) and has highest observed frequency in the European (non-Finnish) population (AF= 8.47509e-07; MAF= 0.00008%, 1/1179928 alleles, homozygotes = 0).
Absent from gnomAD v2.1.
Absent from gnomAD-Canada v1.0.
SpliceAI predicts no significant splice impact for this variant (max delta score = 0.04). REVEL score = 0.897. BayesDel score = 0.10537.
8 paper records listed. 1 cited in the classification.
The p53 N236S (p53 N239S in human, p53S) mutation has been shown to lose wild type p53 function by yeast assay. ... Functional assays in yeast and structure-function predictions indicate that p53 N239S is a non-functional mutation.
Location Abstract; Introduction paragraphs 2-5; Results (Figures 1-4); Discussion paragraphs 1-4
Context Mouse embryonic fibroblasts (p53-/- MEFs), EMSA with in vitro translated proteins, real-time PCR, xenograft in SCID mice, Western blotting, flow cytometry
Site-directed mutagenesis was used to produce 2 RA-derived mutants: asparagine→serine at codon 239 (N239S) and arginine→stop at codon 213 (R213*).
Abstract
239 | AAC→AGC | Asn→Ser
Table I (tumor O90b); Results paragraph 1
Screenshots represent source records captured during evidence collection. Select one to view the recorded source content.
The evidence statements recorded by the interpretation pipeline. They have not been reinterpreted by the page.
This variant is present in gnomAD v4.1 (AF= 6.1962e-07; MAF= 0.00006%, 1/1613892 alleles, homozygotes = 0) and has highest observed frequency in the European (non-Finnish) population (AF= 8.47509e-07; MAF= 0.00008%, 1/1179928 alleles, homozygotes = 0).
Absent from gnomAD v2.1.
Absent from gnomAD-Canada v1.0.
This variant has been reported in ClinVar as Likely pathogenic (6 clinical laboratories) and as Pathogenic (1 clinical laboratory). (ClinVarID = 376637)
SpliceAI predicts no significant splice impact for this variant (max delta score = 0.04). REVEL score = 0.897. BayesDel score = 0.10537.
OncoKB identified variant-specific curated literature and context relevant to functional review; biological-effect context: Loss-of-function; curated oncogenicity label: Oncogenic.
This variant lies in a statistically significant hotspot. This variant has previously been reported in somatic cancers (COSMIC; COSV52661127, n = 56 times).
This variant lies in a statistically significant hotspot.