rs786204543

Positions:

• chr11-108244089-CT-C
• chr11-108244089-CT-CTT

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_000051.4(ATM):​c.640delT​(p.Ser214fs) variant causes a frameshift change. The variant allele was found at a frequency of 0.00000342 in 1,461,570 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Likely pathogenic (★★). Variant results in nonsense mediated mRNA decay.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000034 (0 hom.)
• Consequence: ATM NM_000051.4 frameshift
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:10
• Conservation: PhyloP100: 3.85

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]

ATM (HGNC:):

ACMG classification

Verdict is Pathogenic. Variant got 18 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 11-108244089-CT-C is Pathogenic according to our data. Variant chr11-108244089-CT-C is described in ClinVar as [Likely_pathogenic]. Clinvar id is 188895.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr11-108244089-CT-C is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
ATM	NM_000051.4	c.640delT	p.Ser214fs	frameshift_variant	6/63	ENST00000675843.1	NP_000042.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
ATM	ENST00000675843.1	c.640delT	p.Ser214fs	frameshift_variant	6/63		NM_000051.4	ENSP00000501606.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000342 AC: 5 AN: 1461570 Hom.: 0 Cov.: 34 AF XY: 0.00000275 AC XY: 2 AN XY: 727078

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.0000224

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000360

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000378

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:10

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Ataxia-telangiectasia syndrome Pathogenic:4

Pathogenic, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	Nov 16, 2020	Variant summary: ATM c.640delT (p.Ser214ProfsX16) results in a premature termination codon, predicted to cause a truncation of the encoded protein or absence of the protein due to nonsense mediated decay, which are commonly known mechanisms for disease. Truncations downstream of this position have been classified as pathogenic by our laboratory. The variant was absent in 251182 control chromosomes. c.640delT has been reported in the literature in multiple individuals affected with Ataxia-Telangiectasia (e.g. Byrd_1996, Mitui_2003, Coutinho_2004, Demuth_2011). These data indicate that the variant is very likely to be associated with disease. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. Five clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014 without evidence for independent evaluation. All laboratories cited the variant as pathogenic. Based on the evidence outlined above, the variant was classified as pathogenic. -
Pathogenic, criteria provided, single submitter	clinical testing	Mendelics	Jul 02, 2018	- -
Likely pathogenic, criteria provided, single submitter	literature only	Counsyl	Jul 23, 2014	- -
Pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Aug 30, 2023	For these reasons, this variant has been classified as Pathogenic. ClinVar contains an entry for this variant (Variation ID: 188895). This premature translational stop signal has been observed in individual(s) with breast cancer or referred for cancer panel testing and ataxia-telangiectasia (PMID: 8789452, 12815592, 15039971, 21445571, 21965147, 26681312). This variant is not present in population databases (gnomAD no frequency). This sequence change creates a premature translational stop signal (p.Ser214Profs*16) in the ATM gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in ATM are known to be pathogenic (PMID: 23807571, 25614872). -

Familial cancer of breast Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	Myriad Genetics, Inc.	Jan 10, 2024	This variant is considered pathogenic. This variant creates a frameshift predicted to result in premature protein truncation. -
Pathogenic, criteria provided, single submitter	clinical testing	Baylor Genetics	Jan 16, 2024	- -

Hereditary cancer-predisposing syndrome Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	Color Diagnostics, LLC DBA Color Health	Feb 27, 2023	This variant deletes 1 nucleotide in exon 6 of the ATM gene, creating a frameshift and premature translation stop signal. This variant is expected to result in an absent or non-functional protein product. This variant has been reported in individuals affected with ataxia-telangiectasia (PMID: 8789452, 15039971, 21965147), breast cancer (PMID: 27913932, 36329109), and an individual referred for cancer screening (PMID: 26681312). This variant has not been identified in the general population by the Genome Aggregation Database (gnomAD). Loss of ATM function is a known mechanism of disease (clinicalgenome.org). Based on the available evidence, this variant is classified as Pathogenic. -
Pathogenic, criteria provided, single submitter	clinical testing	Ambry Genetics	Nov 26, 2024	The c.640delT pathogenic mutation, located in coding exon 5 of the ATM gene, results from a deletion of one nucleotide at nucleotide position 640, causing a translational frameshift with a predicted alternate stop codon (p.S214Pfs*16). This mutation, either in a homozygous state or in conjunction with another pathogenic mutation in the ATM gene, has been reported in multiple patients diagnosed with ataxia-telangiectasia (Byrd PJ et al. Hum. Mol. Genet. 1996 Jan;5:145-9; Mitui M et al. Hum Mutat. 2003 Jul;22:43-50; Coutinho G et al. Am J Med Genet A. 2004 Apr;126A:33-40; Demuth I et al. Neurogenetics. 2011 Nov;12:273-82; Carranza D et al. Neuromolecular Med. 2017 Mar;19:161-174). This alteration has also been detected in several patients diagnosed with breast cancer (Yang Z et al. Breast Cancer Res Treat. 2019 Apr;174:639-647; Tavera-Tapia A et al. Breast Cancer Res Treat. 2017 02;161:597-604). This variant is considered to be rare based on population cohorts in the Genome Aggregation Database (gnomAD). In addition to the clinical data presented in the literature, this alteration is expected to result in loss of function by premature protein truncation or nonsense-mediated mRNA decay. As such, this alteration is interpreted as a disease-causing mutation. -

See cases Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Laboratorio de Genetica e Diagnostico Molecular, Hospital Israelita Albert Einstein

Jan 21, 2021

ACMG classification criteria: PVS1, PS4, PM2, PM3 -

not provided Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

GeneDx

Apr 27, 2018

This deletion of one nucleotide in ATM is denoted c.640delT at the cDNA level and p.Ser214ProfsX16 (S214PfsX16) at the protein level. The normal sequence, with the base that is deleted in brackets, is CTTTTTT[delT]CCAA. The deletion causes a frameshift which changes a Serine to a Proline at codon 214, and creates a premature stop codon at position 16 of the new reading frame. This variant is predicted to cause loss of normal protein function through either protein truncation or nonsense-mediated mRNA decay. ATM Ser214ProfsX16 is reported to be a Spanish founder variant and has been observed in both individuals with ataxia telangiectasia and breast cancer (Byrd 1996, Mitui 2003, Coutinho 2004, Demuth 2011, Carranza 2017, Tavera-Tapia 2017). We consider this variant to be pathogenic. -

Computational scores

Source: dbNSFP v4.3

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

Publications

LitVar

Other links and lift over

dbSNP: rs786204543; hg19: chr11-108114816;