11-108321329-C-T

Position:

• chr11-108321329-C-T

Variant summary

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

The NM_000051.4(ATM):​c.6481C>T​(p.Arg2161Cys) 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 (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R2161G) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: ATM NM_000051.4 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:3
• Conservation: PhyloP100: 7.34

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 2 ACMG points.

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

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
ATM	NM_000051.4	c.6481C>T	p.Arg2161Cys	missense_variant	45/63	ENST00000675843.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
ATM	ENST00000675843.1	c.6481C>T	p.Arg2161Cys	missense_variant	45/63		NM_000051.4	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Ataxia-telangiectasia syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Apr 12, 2023

This sequence change replaces arginine, which is basic and polar, with cysteine, which is neutral and slightly polar, at codon 2161 of the ATM protein (p.Arg2161Cys). This variant is not present in population databases (gnomAD no frequency). 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 tolerated. ClinVar contains an entry for this variant (Variation ID: 419565). This variant has not been reported in the literature in individuals affected with ATM-related conditions. -

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

GeneDx

Aug 02, 2018

This variant is denoted ATM c.6481C>T at the cDNA level, p.Arg2161Cys (R2161C) at the protein level, and results in the change of an Arginine to a Cysteine (CGC>TGC). This variant has not, to our knowledge, been published in the literature as pathogenic or benign. ATM Arg2161Cys was not observed in large population cohorts (Lek 2016). Since Arginine and Cysteine differ in polarity, charge, size or other properties, this is considered a non-conservative amino acid substitution. ATM Arg2161Cys is located in the FAT domain (Stracker 2013). In silico analysis, which includes protein predictors and evolutionary conservation, supports that this variant does not alter protein structure/function. Based on currently available information, it is unclear whether ATM Arg2161Cys is pathogenic or benign. We consider it to be a variant of uncertain significance. -

Hereditary cancer-predisposing syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Oct 24, 2023

The p.R2161C variant (also known as c.6481C>T), located in coding exon 44 of the ATM gene, results from a C to T substitution at nucleotide position 6481. The arginine at codon 2161 is replaced by cysteine, an amino acid with highly dissimilar properties. This amino acid position is poorly conserved in available vertebrate species. In addition, this alteration is predicted to be tolerated by in silico analysis. 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	0.088
BayesDel_addAF	Benign	-0.0010	T
BayesDel_noAF	Benign	-0.24
CADD	Pathogenic	26
DANN	Uncertain	0.99
DEOGEN2	Benign	0.051	T;T
Eigen	Benign	-0.094
Eigen_PC	Benign	0.10
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Uncertain	0.94	D;.
M_CAP	Uncertain	0.26	D
MetaRNN	Uncertain	0.43	T;T
MetaSVM	Benign	-0.87	T
MutationAssessor	Benign	0.0	N;N
MutationTaster	Benign	1.0	D;D;D
PrimateAI	Benign	0.41	T
PROVEAN	Benign	0.070	N;N
REVEL	Benign	0.28
Sift	Benign	0.072	T;T
Sift4G	Benign	0.093	T;T
Polyphen		0.50	P;P
Vest4		0.44
MutPred		0.68		Loss of disorder (P = 0.0206);Loss of disorder (P = 0.0206);
MVP		0.76
MPC		0.17
ClinPred		0.78	D
GERP RS		4.9
Varity_R		0.43
gMVP		0.37

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.11		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: rs1064793958; hg19: chr11-108192056;