11-108244892-A-T

Variant names:

• chr11-108244892-A-T
• rs907941927
• NM_000051.4:c.767A>T

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_000051.4(ATM):​c.767A>T​(p.Asp256Val) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency: Genomes: not found (cov: 31)
• Consequence: ATM NM_000051.4 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 8.65

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 Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ATM	NM_000051.4	c.767A>T	p.Asp256Val	missense_variant	Exon 7 of 63	ENST00000675843.1	NP_000042.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ATM	ENST00000675843.1	c.767A>T	p.Asp256Val	missense_variant	Exon 7 of 63		NM_000051.4	ENSP00000501606.1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 31

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Ataxia-telangiectasia syndrome Uncertain:1

Jan 26, 2023

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This missense change has been observed in individual(s) with cerebellar ataxia (PMID: 31429931). This sequence change replaces aspartic acid, which is acidic and polar, with valine, which is neutral and non-polar, at codon 256 of the ATM protein (p.Asp256Val). This variant is not present in population databases (gnomAD no frequency). ClinVar contains an entry for this variant (Variation ID: 482738). Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be disruptive. 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. -

Hereditary cancer-predisposing syndrome Uncertain:1

Nov 30, 2023

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.D256V variant (also known as c.767A>T), located in coding exon 6 of the ATM gene, results from an A to T substitution at nucleotide position 767. The aspartic acid at codon 256 is replaced by valine, an amino acid with highly dissimilar properties. This alteration was identified in an individual diagnosed with early onset cerebellar ataxia (Shakya S et al. Clin Genet, 2019 Dec;96:566-574). This amino acid position is not well conserved in available vertebrate species. In addition, the in silico prediction for this alteration is inconclusive. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.32
BayesDel_addAF	Uncertain	0.097	D
BayesDel_noAF	Benign	-0.10
CADD	Uncertain	24
DANN	Uncertain	0.99
DEOGEN2	Benign	0.22	.;T;T
Eigen	Uncertain	0.46
Eigen_PC	Uncertain	0.54
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.90	D;D;.
M_CAP	Uncertain	0.18	D
MetaRNN	Uncertain	0.48	T;T;T
MetaSVM	Benign	-0.54	T
MutationAssessor	Benign	1.8	.;L;L
PrimateAI	Benign	0.36	T
PROVEAN	Uncertain	-4.1	D;D;D
REVEL	Uncertain	0.35
Sift	Uncertain	0.0030	D;D;D
Sift4G	Uncertain	0.0050	D;D;D
Polyphen		0.72	.;P;P
Vest4		0.62, 0.59
MutPred		0.45		Gain of helix (P = 0.062);Gain of helix (P = 0.062);Gain of helix (P = 0.062);
MVP		0.84
MPC		0.41
ClinPred		0.99	D
GERP RS		5.3
Varity_R		0.58
gMVP		0.44

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		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: rs907941927; hg19: chr11-108115619;