NM_000051.4:c.7661A>G

Variant names:

• chr11-108331910-A-G
• rs1555124487
• NM_000051.4:c.7661A>G

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM3 PM2_Supporting PP3

This summary comes from the ClinGen Evidence Repository: The c.7661A>G variant in ATM is a missense variant predicted to cause substitution of histidine by arginine at amino acid 2554 (p.His2554Arg). This variant has been detected in at least 1 individual with Ataxia-Telangiectasia (PMID:26896183). This variant is absent from gnomAD v.2.1.1. The computational predictor REVEL gives a score of 0.884, which is above the threshold of 0.733, evidence that correlates with impact to ATM function. In summary, this variant meets the criteria to be classified as a variant of uncertain significance for autosomal dominant ATM-related cancer predisposition and autosomal recessive Ataxia-Telangiectasia based on the ACMG/AMP criteria applied, as specified by the HBOP VCEP. (PM3, PM2_Supporting, PP3) LINK:https://erepo.genome.network/evrepo/ui/classification/CA501111/MONDO:0700270/020

• Frequency: Genomes: not found (cov: 32)
• Consequence: ATM NM_000051.4 missense
• Clinical Significance: Uncertain significance reviewed by expert panel U:2
• Conservation: PhyloP100: 7.35

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

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM2: For more information check the summary or visit ClinGen Evidence Repository.
• PM3: For more information check the summary or visit ClinGen Evidence Repository.
• PP3: For more information check the summary or visit ClinGen Evidence Repository.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ATM	NM_000051.4	c.7661A>G	p.His2554Arg	missense_variant	Exon 52 of 63	ENST00000675843.1	NP_000042.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ATM	ENST00000675843.1	c.7661A>G	p.His2554Arg	missense_variant	Exon 52 of 63		NM_000051.4	ENSP00000501606.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: reviewed by expert panel

Submissions by phenotype

Ataxia-telangiectasia syndrome Uncertain:1

Dec 08, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces histidine, which is basic and polar, with arginine, which is basic and polar, at codon 2554 of the ATM protein (p.His2554Arg). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individual(s) with autosomal recessive ataxia-telangiectasia (PMID: 26896183). ClinVar contains an entry for this variant (Variation ID: 846136). Invitae Evidence Modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) has been performed for this missense variant. However, the output from this modeling did not meet the statistical confidence thresholds required to predict the impact of this variant on ATM protein function. This variant disrupts the p.His2554 amino acid residue in ATM. Other variant(s) that disrupt this residue have been observed in individuals with ATM-related conditions (PMID: 9463314, 26896183), which suggests that this may be a clinically significant amino acid residue. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

ATM-related cancer predisposition Uncertain:1

Nov 26, 2024

ClinGen Hereditary Breast, Ovarian and Pancreatic Cancer Variant Curation Expert Panel, ClinGen

Significance: Uncertain significance

Review Status: reviewed by expert panel

Collection Method: curation

The c.7661A>G variant in ATM is a missense variant predicted to cause substitution of histidine by arginine at amino acid 2554 (p.His2554Arg). This variant has been detected in at least 1 individual with Ataxia-Telangiectasia (PMID: 26896183). This variant is absent from gnomAD v.2.1.1. The computational predictor REVEL gives a score of 0.884, which is above the threshold of 0.733, evidence that correlates with impact to ATM function. In summary, this variant meets the criteria to be classified as a variant of uncertain significance for autosomal dominant ATM-related cancer predisposition and autosomal recessive Ataxia-Telangiectasia based on the ACMG/AMP criteria applied, as specified by the HBOP VCEP. (PM3, PM2_Supporting, PP3) -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.59
BayesDel_addAF	Pathogenic	0.40	D
BayesDel_noAF	Pathogenic	0.34
CADD	Uncertain	24
DANN	Uncertain	1.0
DEOGEN2	Benign	0.37	T;T
Eigen	Pathogenic	0.74
Eigen_PC	Pathogenic	0.70
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Uncertain	0.89	D;.
M_CAP	Pathogenic	0.44	D
MetaRNN	Pathogenic	0.91	D;D
MetaSVM	Uncertain	0.44	D
MutationAssessor	Uncertain	2.6	M;M
PrimateAI	Uncertain	0.55	T
PROVEAN	Pathogenic	-5.8	D;D
REVEL	Pathogenic	0.88
Sift	Uncertain	0.0060	D;D
Sift4G	Uncertain	0.0060	D;D
Polyphen		1.0	D;D
Vest4		0.94
MutPred		0.59		Gain of helix (P = 0.0854);Gain of helix (P = 0.0854);
MVP		0.96
MPC		0.62
ClinPred		0.99	D
GERP RS		5.3
Varity_R		0.68
gMVP		0.78

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: rs1555124487; hg19: chr11-108202637;