11-108235772-T-G

Variant names:

• chr11-108235772-T-G
• rs1555059346
• NM_000051.4:c.434T>G

Variant summary

Our verdict is Uncertain significance. Variant got 5 ACMG points: 5P and 0B. PM2 PP3_Moderate PP5

The NM_000051.4(ATM):​c.434T>G​(p.Leu145Arg) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,438 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: ATM NM_000051.4 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:2 U:1
• Conservation: PhyloP100: 7.52

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 5 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.868
• PP5: Variant 11-108235772-T-G is Pathogenic according to our data. Variant chr11-108235772-T-G is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 453518.We mark this variant Likely_pathogenic, oryginal submissions are: {Likely_pathogenic=2, Uncertain_significance=1}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ATM	NM_000051.4	c.434T>G	p.Leu145Arg	missense_variant	Exon 5 of 63	ENST00000675843.1	NP_000042.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ATM	ENST00000675843.1	c.434T>G	p.Leu145Arg	missense_variant	Exon 5 of 63		NM_000051.4	ENSP00000501606.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461438 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 727038

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: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 8.99e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:2 Uncertain:1

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Hereditary cancer-predisposing syndrome Pathogenic:1

Jan 23, 2025

Ambry Genetics

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.L145R variant (also known as c.434T>G), located in coding exon 4 of the ATM gene, results from a T to G substitution at nucleotide position 434. The leucine at codon 145 is replaced by arginine, an amino acid with dissimilar properties. This alteration has been identified in multiple individuals diagnosed with ataxia telangiectasia (Podralska MJ et al. Mol Genet Genomic Med, 2014 Nov;2:504-11; Czarny J et al. Int J Mol Sci, 2023 Jan;24:). This amino acid position is highly conserved in available vertebrate species. In addition, this alteration is predicted to be deleterious by in silico analysis. This variant is considered to be rare based on population cohorts in the Genome Aggregation Database (gnomAD). Based on the majority of available evidence to date, this variant is likely to be pathogenic. -

Hereditary breast ovarian cancer syndrome Pathogenic:1

Jan 09, 2024

German Consortium for Hereditary Breast and Ovarian Cancer, University Hospital Cologne

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: curation

. According to the ACMG standard criteria we chose these criteria: PM2 (supporting pathogenic): not in gnomAD v3.1.2 (non cancer), PM3 (strong pathogenic): Found compound heterozygous in multiple Cases with AT PMID: 36674612 (Czarny et al.,2023) PMID: 25614872 (Podralska MJ et al., 2014), PP3 (supporting pathogenic): CADD:27.8 REVEL: 0.936 BayesDEL:0.334485 -

Ataxia-telangiectasia syndrome Uncertain:1

Jan 22, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces leucine, which is neutral and non-polar, with arginine, which is basic and polar, at codon 145 of the ATM protein (p.Leu145Arg). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individual(s) with ataxia-telangiectasia (PMID: 25614872). ClinVar contains an entry for this variant (Variation ID: 453518). 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. 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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.98
BayesDel_addAF	Pathogenic	0.40	D
BayesDel_noAF	Pathogenic	0.33
CADD	Pathogenic	27
DANN	Uncertain	1.0
DEOGEN2	Benign	0.28	.;T;.;T
Eigen	Pathogenic	0.81
Eigen_PC	Pathogenic	0.78
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.90	D;D;D;.
M_CAP	Pathogenic	0.62	D
MetaRNN	Pathogenic	0.87	D;D;D;D
MetaSVM	Uncertain	0.35	D
MutationAssessor	Uncertain	2.6	.;M;.;M
PrimateAI	Uncertain	0.76	T
PROVEAN	Uncertain	-4.3	D;D;.;D
REVEL	Pathogenic	0.94
Sift	Uncertain	0.0010	D;D;.;D
Sift4G	Pathogenic	0.0	D;D;D;D
Polyphen		1.0	.;D;.;D
Vest4		0.98, 0.97, 0.99
MutPred		0.59		Loss of stability (P = 0.0036);Loss of stability (P = 0.0036);Loss of stability (P = 0.0036);Loss of stability (P = 0.0036);
MVP		0.98
MPC		0.71
ClinPred		1.0	D
GERP RS		5.6
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.71
gMVP		0.88

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: rs1555059346; hg19: chr11-108106499; COSMIC: COSV53769582; COSMIC: COSV53769582;