11-108251012-T-C

Position:

• chr11-108251012-T-C

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2 PP3 PP5

The NM_000051.4(ATM):​c.1547T>C​(p.Leu516Ser) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. 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)
• Consequence: ATM NM_000051.4 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:1 U:1
• Conservation: PhyloP100: 4.73

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 Uncertain_significance. Variant got 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.835
• PP5: Variant 11-108251012-T-C is Pathogenic according to our data. Variant chr11-108251012-T-C is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 185468.We mark this variant Likely_pathogenic, oryginal submissions are: {Uncertain_significance=1, Likely_pathogenic=1}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
ATM	NM_000051.4	c.1547T>C	p.Leu516Ser	missense_variant	10/63	ENST00000675843.1	NP_000042.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
ATM	ENST00000675843.1	c.1547T>C	p.Leu516Ser	missense_variant	10/63		NM_000051.4	ENSP00000501606.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 35

GnomAD4 genome Cov.: 32

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:1 Uncertain:1

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Hereditary cancer-predisposing syndrome Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Ambry Genetics

Apr 21, 2023

The p.L516S variant (also known as c.1547T>C), located in coding exon 9 of the ATM gene, results from a T to C substitution at nucleotide position 1547. The leucine at codon 516 is replaced by serine, an amino acid with dissimilar properties. This alteration was identified in cis with ATM c.1514T>C (p.F505S) in four children from a consanguineous Arabic family with a mild presentation of Ataxia Telangiectasia, each of whose parents were found to be heterozygous for this haplotype. This same report also found that cells from these children showed reduced, but not absent, ATM protein expression as well as reduced and delayed phosphorylation of KAP1 (an ATM substrate) after neocarzinostatin-induced DNA damage (Bielorai B et al. Pediatr Hematol Oncol, 2013 Sep;30:574-82). This amino acid position is highly conserved in available vertebrate species. In addition, this alteration is predicted to be deleterious by in silico analysis. Based on the majority of available evidence to date, this variant is likely to be pathogenic. -

Ataxia-telangiectasia syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Sep 01, 2023

ClinVar contains an entry for this variant (Variation ID: 185468). 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. An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant is likely to be disruptive. This missense change has been observed in individual(s) with clinical features of ataxia telangiectasia and malignant peritoneal mesothelioma (PMID: 23509889, 30124550). This variant is not present in population databases (gnomAD no frequency). This sequence change replaces leucine, which is neutral and non-polar, with serine, which is neutral and polar, at codon 516 of the ATM protein (p.Leu516Ser). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.55
BayesDel_addAF	Pathogenic	0.30	D
BayesDel_noAF	Pathogenic	0.19
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Benign	0.19	.;T;T
Eigen	Pathogenic	0.75
Eigen_PC	Pathogenic	0.75
FATHMM_MKL	Pathogenic	0.97	D
LIST_S2	Benign	0.69	T;T;.
M_CAP	Pathogenic	0.54	D
MetaRNN	Pathogenic	0.83	D;D;D
MetaSVM	Uncertain	-0.11	T
MutationAssessor	Uncertain	2.7	.;M;M
PrimateAI	Benign	0.47	T
PROVEAN	Uncertain	-3.1	D;N;N
REVEL	Pathogenic	0.82
Sift	Uncertain	0.0010	D;D;D
Sift4G	Uncertain	0.0070	D;D;D
Polyphen		1.0	.;D;D
Vest4		0.94, 0.96
MutPred		0.59		Gain of sheet (P = 0.0061);Gain of sheet (P = 0.0061);Gain of sheet (P = 0.0061);
MVP		0.98
MPC		0.64
ClinPred		0.96	D
GERP RS		6.2
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.9
Varity_R		0.28
gMVP		0.62

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: rs786202195; hg19: chr11-108121739;