rs56075338

chr11-108307893-T-Achr11-108307893-T-C

Variant summary

Our verdict is Likely benign. Variant got -5 ACMG points: 0P and 5B. BP4_Strong BP6

The NM_000051.4(ATM):c.5675-4T>A variant causes a splice region, splice polypyrimidine tract, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000862 in 1,611,668 control chromosomes in the GnomAD database, including 2 homozygotes. In-silico tool predicts a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: 𝑓 0.000026 (0 hom., cov: 32)
  • Exomes 𝑓: 0.000092 (2 hom.)
• Consequence: ATM NM_000051.4 splice_region, splice_polypyrimidine_tract, intron
• Scores: Splicing: ADA: 0.005423
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:3 B:7
• Conservation: PhyloP100: 1.83

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]

ACMG classification

Verdict is Likely_benign. Variant got -5 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.62).
• BP6: Variant 11-108307893-T-A is Benign according to our data. Variant chr11-108307893-T-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 215585.We mark this variant Likely_benign, oryginal submissions are: {Benign=1, Uncertain_significance=2, Likely_benign=5}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
ATM	NM_000051.4	c.5675-4T>A		splice_region_variant, splice_polypyrimidine_tract_variant, intron_variant		ENST00000675843.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
ATM	ENST00000675843.1	c.5675-4T>A		splice_region_variant, splice_polypyrimidine_tract_variant, intron_variant			NM_000051.4	P1

Frequencies

GnomAD3 genomes AF: 0.0000263 AC: 4 AN: 152156 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.000192

Gnomad SAS AF: 0.000621

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00

Gnomad OTH AF: 0.00

GnomAD3 exomes AF: 0.000195 AC: 49 AN: 250712 Hom.: 1 AF XY: 0.000280 AC XY: 38 AN XY: 135490

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00157

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00000882

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000925 AC: 135 AN: 1459512 Hom.: 2 Cov.: 30 AF XY: 0.000145 AC XY: 105 AN XY: 726190

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00152

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000270

Gnomad4 OTH exome AF: 0.0000166

GnomAD4 genome AF: 0.0000263 AC: 4 AN: 152156 Hom.: 0 Cov.: 32 AF XY: 0.0000135 AC XY: 1 AN XY: 74346

Gnomad4 AFR AF: 0.00

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.000192

Gnomad4 SAS AF: 0.000621

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.00

Gnomad4 OTH AF: 0.00

Bravo AF: 0.0000189

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:3 Benign:7

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Ataxia-telangiectasia syndrome Uncertain:2 Benign:1

Benign, criteria provided, single submitter	clinical testing	Invitae	Jan 30, 2024	- -
Uncertain significance, no assertion criteria provided	clinical testing	Natera, Inc.	Apr 18, 2020	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Jan 13, 2018	This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

Hereditary cancer-predisposing syndrome Benign:3

Likely benign, criteria provided, single submitter	clinical testing	Ambry Genetics	Dec 01, 2020	This alteration is classified as likely benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -
Likely benign, criteria provided, single submitter	curation	Sema4, Sema4	Sep 16, 2021	- -
Likely benign, criteria provided, single submitter	clinical testing	Color Diagnostics, LLC DBA Color Health	Jun 09, 2015	- -

not provided Uncertain:1 Benign:1

Uncertain significance, criteria provided, single submitter	clinical testing	GeneDx	Jul 06, 2018	This variant is denoted ATM c.5675-4T>A or IVS37-4T>A and consists of a T>A nucleotide substitution at the -4 position of intron 37 of the ATM gene. In silico analyses, which include splice predictors and evolutionary conservation, are inconsistent in their assessment as to whether or not the variant is damaging.? This variant has not, to our knowledge, been published in the literature as a pathogenic or benign germline variant. This variant was observed at an allele frequency of 0.15% (47/30,736) in individuals of South Asian ancestry in large population cohorts (Lek 2016). Based on currently available evidence, it is unclear whether ATM c.5675-4T>A is a pathogenic or benign variant. We consider it to be a variant of uncertain significance. -
Likely benign, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	Sep 30, 2016	Variant summary: The ATM c.5675-4T>A variant involves the alteration of a non-conserved intronic nucleotide with 4/5 splice prediction tools predicting no significant impact on normal splicing and ESE finder predicting the creation of an ESE binding site, however, these predictions have yet to be functionally assessed. The variant of interest has been observed in the large, broad control population, ExAC, with an allele frequency of 35/116558 (1/3330, 1 homozygote), predominantly in the South Asian cohort, 33/15866 (1/480), which exceeds the estimated maximal expected allele frequency for a pathogenic ATM variant of 1/999. Therefore, suggesting the variant is a common polymorphism found in population(s) of South Asian origin. The variant of interest, to our knowledge, has not been reported in affected individuals via publications, however, clinical diagnostic laboratories have cited the variant as "likely benign" or "uncertain significance." Therefore, the variant of interest has been classified as Likely Benign. -

ATM-related disorder Benign:1

Likely benign, criteria provided, single submitter

clinical testing

PreventionGenetics, part of Exact Sciences

Apr 03, 2019

This variant is classified as likely benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

Malignant tumor of breast Benign:1

Likely benign, no assertion criteria provided

clinical testing

Department of Pathology and Laboratory Medicine, Sinai Health System

-

The ATM c.5675-4T>A variant was not identified in the literature nor was it identified in the GeneInsight-COGR, Cosmic, or LOVD 3.0 databases. The variant was identified in dbSNP (ID: rs56075338) as "With Uncertain significance allele" and ClinVar (classified as likely benign by Invitae; as uncertain significance by Ambry Genetics, GeneDx, and one other clinical laboratory). The variant was identified in control databases in 48 of 245526 chromosomes (1 homozygous) at a frequency of 0.0002 increasing the likelihood this could be a low frequency benign variant (Genome Aggregation Database Feb 27, 2017). The variant was observed in the following populations: European in 1 of 111308 chromosomes (freq: 0.000009) and South Asian in 47 of 30736 chromosomes (1 homozygous, freq: 0.0015), while the variant was not observed in the African, Other, Latino, Ashkenazi Jewish, East Asian, or Finnish populations. The c.5675-4T>A variant is located in the 3' splice region but does not affect the invariant -1 and -2 positions; positions -3 and -5 to -12 are part of the splicing consensus sequence and variants involving these positions sometimes affect splicing. In silico or computational prediction software programs (SpliceSiteFinder, MaxEntScan, NNSPLICE, GeneSplicer) do not predict a difference in splicing. In summary, based on the above information the clinical significance of this variant cannot be determined with certainty at this time although we would lean towards a more benign role for this variant. This variant is classified as likely benign. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.62
Cadd	Benign	13
Dann	Benign	0.89
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.0054
dbscSNV1_RF	Benign	0.048
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: rs56075338; hg19: chr11-108178620;