About ATM
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 pathogenic. Select a step to read what it means.
Pathogenic.A 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 ATM VCEP v1.5. 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.
NM_000051.4:c.7913G>A is a nonsense variant producing a premature termination codon at p.Trp2638 in exon 53 of ATM. Loss of function is a well-established disease mechanism for ATM, and the HBOP VCEP PVS1 decision tree supports application of PVS1 at very strong strength for this variant. The PTC is upstream of p.Arg3047 (the most C-terminal known pathogenic variant), and NMD is expected.
c.7913G>A is present at extremely low frequency in gnomAD v4.1 (allele frequency = 0.00074%, 12/1,612,586 alleles, 0 homozygotes; grpmax FAF = 0.007%). This is well below the VCEP threshold of ≤0.001% for PM2_Supporting.
c.7913G>A produces a premature termination codon at p.Trp2638, which is upstream of p.Arg3047 — the most C-terminal known pathogenic variant in ATM. PM5_Supporting applied per VCEP truncation cutoff rule for frameshifting or truncating variants with PTCs upstream of p.Arg3047.
No benign criterion marked as applied in the recorded assessment.
ClinGen Hereditary Breast, Ovarian and Pancreatic Cancer Expert Panel Specifications to the ACMG/AMP Variant Interpretation Guidelines for ATM Version 1.5 v1.5 criteria-combination framework: matched Rule4 (1 Pathogenic.Very Strong + Pathogenic.Supporting >=2) with applied criteria: PVS1 very strong, PM2 supporting, PM5 supporting; maps to Pathogenic.
Evidence summaries and captured source records, where available. Missing entries should not be interpreted as negative findings.
gnomAD v4.1: 12 / 1,612,586 alleles. Recorded AF 7.44146e-06. Recorded homozygote count 0.
This variant is present in gnomAD v2.1 (AF= 1.77475e-05; MAF= 0.00177%, 5/281730 alleles, homozygotes = 0) and has highest observed frequency in the African/African American population (AF= 0.000160372; MAF= 0.01604%, 4/24942 alleles, homozygotes = 0); grpmax FAF= 9.374e-05.
Absent from gnomAD-Canada v1.0.
Recorded SpliceAI maximum delta score: 0.150. Refer to the recorded PP3/BP4 rationale for interpretation.
19 Pathogenic · 1 Likely pathogenic · 1 pathogenic. ClinVar API review status: criteria provided, multiple submitters, no conflicts.
OncoKB identified variant-specific curated literature and context relevant to functional review; biological-effect context: Likely Loss-of-function; curated oncogenicity label: Likely Oncogenic.
This variant has not previously been reported in somatic cancers (COSMIC).
This variant does not lie in a statistically significant hotspot.
ACMG/AMP criteria under ClinGen ATM VCEP v1.5, with the data and sources behind each one.
26 criteria with recorded statuses: 3 met · 8 not met · 1 not assessed · 14 not applicable. Open any row for the full reasoning, the rule and the evidence behind it.
NM_000051.4:c.7913G>A is a nonsense variant (p.Trp2638Ter) in exon 53 of ATM, a gene for which loss of function is a well-established mechanism of disease. The premature termination codon is upstream of p.Arg3047, and NMD is expected. PVS1 is applied at very strong strength per the ClinGen HBOP VCEP ATM PVS1 decision tree.
This variant is present at extremely low frequency in gnomAD v4.1 (AF = 0.00074%, 12/1,612,586 alleles, 0 homozygotes; grpmax FAF = 0.007%), meeting the VCEP PM2_Supporting threshold of ≤0.001%.
The variant produces a premature termination codon at p.Trp2638, upstream of the most C-terminal known pathogenic variant p.Arg3047, satisfying the VCEP PM5_Supporting truncation cutoff rule.
This variant has been observed in the literature in multiple unrelated AT patients: as a compound heterozygous mutation (with c.3802delG) in Brazilian AT patients (Coutinho et al. 2004, PMID:15039971), as a homozygous mutation in a consanguineous African-Brazilian patient with classical AT (Demuth et al. 2011, PMID:21965147), and as a homozygous mutation in an AT proband (Family 605) studied for gamma-H2AX radiosensitivity (Kato et al. 2006, PMID:16953663). These observations are consistent with biallelic pathogenicity for ataxia telangiectasia.
The VCEP combination rule 4 is satisfied: 1 Very Strong criterion (PVS1) + ≥2 Supporting criteria (PM2_Supporting, PM5_Supporting) → Pathogenic classification.
No criteria match.
No further detail was recorded.
Every interpreted variant in ATM, mapped onto the exon structure of NM_000051.4. Select a row to find it on the plot.
| Protein | Location | Classification | Link |
|---|
| African/African American10 / 74,904 | 0.00013 |
| Admixed American1 / 59,992 | 1.7e-05 |
| Remaining individuals1 / 62,444 | 1.6e-05 |
| African/African American4 / 24,942 | 0.00016 |
| Remaining individuals1 / 7,202 | 0.00014 |
This variant is present in gnomAD v4.1 (AF= 7.44146e-06; MAF= 0.00074%, 12/1612586 alleles, homozygotes = 0) and has highest observed frequency in the African/African American population (AF= 0.000133504; MAF= 0.01335%, 10/74904 alleles, homozygotes = 0); grpmax FAF= 7.23e-05.
This variant is present in gnomAD v2.1 (AF= 1.77475e-05; MAF= 0.00177%, 5/281730 alleles, homozygotes = 0) and has highest observed frequency in the African/African American population (AF= 0.000160372; MAF= 0.01604%, 4/24942 alleles, homozygotes = 0); grpmax FAF= 9.374e-05.
Absent from gnomAD-Canada v1.0.
SpliceAI predicts no significant splice impact for this variant (max delta score = 0.15). BayesDel score = 0.61701.
8 paper records listed. 3 cited in the classification.
The mutation 7913G > A, associated with the recurring haplotype [I], introduces a premature termination codon.
Location Table I (genotype/haplotype correlation table); Results, paragraph on mutations; Discussion, paragraph on founder mutations
Context Protein truncation testing (PTT), SSCP, dHPLC mutation screening in 27 Brazilian AT families; lymphoblastoid cell lines
The proband in family 605 is homozygous for a 7913G>A mutation.
Location Materials and Methods, Genotyping section; Results, Table 1 footnote; Discussion, sibling genotyping results
Context gamma-H2AX focus assay in primary fibroblasts after low-dose-rate (10 cGy/h) and acute (1 Gy) irradiation; Coriell cell strains from Family 605
c.7913G>A / p.W2638X
Location Table 2 (mutation list); Table 3 (clinical data for patient 15106)
Context Western blot for ATM protein, p53 phosphorylation after IR, cell cycle analysis in lymphoblastoid cell lines
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= 7.44146e-06; MAF= 0.00074%, 12/1612586 alleles, homozygotes = 0) and has highest observed frequency in the African/African American population (AF= 0.000133504; MAF= 0.01335%, 10/74904 alleles, homozygotes = 0); grpmax FAF= 7.23e-05.
This variant is present in gnomAD v2.1 (AF= 1.77475e-05; MAF= 0.00177%, 5/281730 alleles, homozygotes = 0) and has highest observed frequency in the African/African American population (AF= 0.000160372; MAF= 0.01604%, 4/24942 alleles, homozygotes = 0); grpmax FAF= 9.374e-05.
Absent from gnomAD-Canada v1.0.
This variant has been reported in ClinVar as Pathogenic (19 clinical laboratories) and as Likely pathogenic (1 clinical laboratory) and as pathogenic (1 clinical laboratory). (ClinVarID = 141233)
SpliceAI predicts no significant splice impact for this variant (max delta score = 0.15). BayesDel score = 0.61701.
OncoKB identified variant-specific curated literature and context relevant to functional review; biological-effect context: Likely Loss-of-function; curated oncogenicity label: Likely Oncogenic.
This variant does not lie in a statistically significant hotspot. This variant has not previously been reported in somatic cancers (COSMIC).
This variant does not lie in a statistically significant hotspot.