rs786203332

Variant names:

• chr11-108325495-A-C
• rs786203332
• NM_000051.4:c.6758A>C

Your query was ambiguous. Multiple possible variants found:

• chr11-108325495-A-C
• chr11-108325495-A-G
• chr11-108325495-A-T

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2 BP4

The NM_000051.4(ATM):​c.6758A>C​(p.Lys2253Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 16/21 in silico tools predict a benign outcome for this variant. 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:6
• Conservation: PhyloP100: 1.82

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 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.29533303).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ATM	NM_000051.4	c.6758A>C	p.Lys2253Thr	missense_variant	Exon 46 of 63	ENST00000675843.1	NP_000042.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ATM	ENST00000675843.1	c.6758A>C	p.Lys2253Thr	missense_variant	Exon 46 of 63		NM_000051.4	ENSP00000501606.1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 31

Bravo AF: 0.00000756

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:6

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Ataxia-telangiectasia syndrome Uncertain:2

Oct 12, 2020

Natera, Inc.

Significance: Uncertain significance

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Jul 21, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces lysine, which is basic and polar, with threonine, which is neutral and polar, at codon 2253 of the ATM protein (p.Lys2253Thr). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individual(s) with chronic lymphocytic leukemia (PMID: 28652578). ClinVar contains an entry for this variant (Variation ID: 186930). An algorithm developed to predict the effect of missense changes on protein structure and function outputs the following: PolyPhen-2: "Benign". The threonine amino acid residue is found in multiple mammalian species, which suggests that this missense change does not adversely affect 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. -

Hereditary cancer-predisposing syndrome Uncertain:2

Aug 01, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.K2253T variant (also known as c.6758A>C), located in coding exon 45 of the ATM gene, results from an A to C substitution at nucleotide position 6758. The lysine at codon 2253 is replaced by threonine, an amino acid with similar properties. This amino acid position is not well conserved in available vertebrate species. In addition, this alteration is predicted to be tolerated by in silico analysis. Based on the available evidence, the clinical significance of this variant remains unclear. -

Jun 06, 2019

Color Diagnostics, LLC DBA Color Health

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

not specified Uncertain:1

Feb 25, 2020

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: ATM c.6758A>C (p.Lys2253Thr) results in a non-conservative amino acid change located in the PIK-related kinase, FAT domain of the encoded protein sequence. Three of four in-silico tools predict a benign effect of the variant on protein function. The variant was absent in 250460 control chromosomes. The available data on variant occurrences in the general population are insufficient to allow any conclusion about variant significance. c.6758A>C has been reported in the literature in an individual affected with CLL (Tiao_2017). This report does not provide unequivocal conclusions about the association of the variant with Ataxia-Telangiectasia. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. Two clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014 without evidence for independent evaluation. All laboratories classified the variant as uncertain significance. Based on the evidence outlined above, the variant was classified as uncertain significance. -

Familial cancer of breast Uncertain:1

Jun 01, 2023

Baylor Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.093
BayesDel_addAF	Benign	-0.078	T
BayesDel_noAF	Benign	-0.35
CADD	Benign	20
DANN	Benign	0.97
DEOGEN2	Benign	0.090	T;T
Eigen	Benign	-0.31
Eigen_PC	Benign	-0.22
FATHMM_MKL	Uncertain	0.79	D
LIST_S2	Benign	0.78	T;.
M_CAP	Benign	0.036	D
MetaRNN	Benign	0.30	T;T
MetaSVM	Benign	-0.97	T
MutationAssessor	Benign	2.0	M;M
PrimateAI	Benign	0.40	T
PROVEAN	Benign	-1.2	N;N
REVEL	Benign	0.11
Sift	Benign	0.25	T;T
Sift4G	Benign	0.30	T;T
Polyphen		0.23	B;B
Vest4		0.20
MutPred		0.77		Loss of ubiquitination at K2253 (P = 0.0218);Loss of ubiquitination at K2253 (P = 0.0218);
MVP		0.76
MPC		0.15
ClinPred		0.14	T
GERP RS		1.5
Varity_R		0.10
gMVP		0.30

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: rs786203332; hg19: chr11-108196222;