chr11-108353878-AAGGT-A

Variant names:

• chr11-108353878-AAGGT-A
• rs1060501569
• ENST00000527805.6:n.*3849_*3850+2delAGGT

Variant summary

Our verdict is Pathogenic. The variant received 12 ACMG points: 12P and 0B. PM2 PP3_Moderate PP5_Very_Strong

The ENST00000527805.6(ATM):​n.*3849_*3850+2delAGGT variant causes a splice region, non coding transcript exon change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. 1/1 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Likely pathogenic (★★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: ATM ENST00000527805.6 splice_region, non_coding_transcript_exon
• Clinical Significance: Likely pathogenic criteria provided, multiple submitters, no conflicts P:4
• Conservation: PhyloP100: 10.0
• Publications: 0 publications found

Genes affected

ATM (HGNC:795): (ATM serine/threonine kinase) The protein encoded by this gene belongs to the PI3/PI4-kinase family. This protein is an important cell cycle checkpoint kinase that phosphorylates; thus, it functions as a regulator of a wide variety of downstream proteins, including tumor suppressor proteins p53 and BRCA1, checkpoint kinase CHK2, checkpoint proteins RAD17 and RAD9, and DNA repair protein NBS1. This protein and the closely related kinase ATR are thought to be master controllers of cell cycle checkpoint signaling pathways that are required for cell response to DNA damage and for genome stability. Mutations in this gene are associated with ataxia telangiectasia, an autosomal recessive disorder. [provided by RefSeq, Aug 2010]

C11orf65 (HGNC:28519): (chromosome 11 open reading frame 65) Predicted to be involved in negative regulation of mitochondrial fission and negative regulation of protein targeting to mitochondrion. Predicted to be located in cytosol and mitochondrial outer membrane. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

Our verdict: Pathogenic. The variant received 12 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: Splicing predictors support a deleterious effect. Scorers claiming Pathogenic: max_spliceai. No scorers claiming Uncertain. No scorers claiming Benign.
• PP5: Variant 11-108353878-AAGGT-A is Pathogenic according to our data. Variant chr11-108353878-AAGGT-A is described in ClinVar as Likely_pathogenic. ClinVar VariationId is 407505.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ATM	NM_000051.4	c.8786_8786+3delGGTA	p.Arg2929AlafsTer8	frameshift_variant, splice_donor_variant, splice_region_variant, intron_variant	Exon 60 of 63	ENST00000675843.1	NP_000042.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ATM	ENST00000675843.1	c.8785_8786+2delAGGT	p.Arg2929AlafsTer8	frameshift_variant, splice_donor_variant, splice_region_variant, intron_variant	Exon 60 of 63		NM_000051.4	ENSP00000501606.1

Frequencies

GnomAD3 genomes Cov.: 32

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome Cov.: 32

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:4

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Hereditary cancer-predisposing syndrome Pathogenic:2

Apr 14, 2025

Molecular Diagnostics Laboratory, Catalan Institute of Oncology

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

PVS1, PM2_supporting c.8786_8786+3del, located in exon 60 of the ATM gene, consists in the deletion of 4 nucleotides, that envolves the last nucleotide of exon 60 and the donor splicing site of intron 60. This alteration is expected to result in loss of function by premature protein truncation and nonsense-mediated mRNA decay. The SpliceAI algorithm predicts that the variant abolishes the splicing donor site of intron 60, which would also result in truncated protein (PVS1). It is not present in the population database gnomAD v2.1.1, non cancer dataset (PM2_supporting). To our knowledge, neither relevant clinical data nor well-stablished functional studies have been reported for this variant. It has been reported in ClinVar (3x LP) and LOVD database (1x P). Based on the currently available information, 8786_8786+3del is classified as a pathogenic variant according to ClinGen-ATM Guidelines version 1.1.

Jan 08, 2019

Ambry Genetics

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.8786_8786+3delGGTA variant results from a deletion of one nucleotide in coding exon 59 and three nucleotides in the adjacent intron of the ATM gene. The deleted region includes the last nucleotide of the exon and the canonical splice donor site, which is highly conserved in available vertebrate species. Using the BDGP and ESEfinder splice site prediction tools, this alteration is predicted to abolish the native splice donor site; however, direct evidence is unavailable. Alterations that disrupt the canonical splice site are expected to cause aberrant splicing, resulting in an abnormal protein or a transcript that is subject to nonsense-mediated mRNA decay. As such, this alteration is classified as likely pathogenic.

Ataxia-telangiectasia syndrome Pathogenic:1

Sep 01, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

In summary, the currently available evidence indicates that the variant is pathogenic, but additional data are needed to prove that conclusively. Therefore, this variant has been classified as Likely Pathogenic. Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may disrupt the consensus splice site. ClinVar contains an entry for this variant (Variation ID: 407505). This variant is also known as c.8785_8788delAGGT; p.Arg2929MetfsTfs*2. This variant has been observed in individual(s) with ataxia-telangiectasia (PMID: 32488064). This variant is not present in population databases (gnomAD no frequency). This variant results in the deletion of part of exon 60 (c.8786_8786+3del) of the ATM gene. It is expected to disrupt RNA splicing. Variants that disrupt the donor or acceptor splice site typically lead to a loss of protein function (PMID: 16199547), and loss-of-function variants in ATM are known to be pathogenic (PMID: 23807571, 25614872).

Familial cancer of breast Pathogenic:1

Feb 05, 2024

Myriad Genetics, Inc.

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant is considered likely pathogenic. This variant occurs within a consensus splice junction and is predicted to result in abnormal mRNA splicing of either an out-of-frame exon or an in-frame exon necessary for protein stability and/or normal function.

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
PhyloP100		10

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		1.0		Details are displayed if max score is > 0.2
DS_DL_spliceai		1.0		Position offset: 2

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

Other links and lift over

dbSNP: rs1060501569; hg19: chr11-108224605;