11-94471644-G-C

Variant summary

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

The NM_005591.4(MRE11):c.775C>G(p.Gln259Glu) 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. Q259R) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: MRE11 NM_005591.4 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 9.77

Genes affected

MRE11 (HGNC:7230): (MRE11 homolog, double strand break repair nuclease) This gene encodes a nuclear protein involved in homologous recombination, telomere length maintenance, and DNA double-strand break repair. By itself, the protein has 3' to 5' exonuclease activity and endonuclease activity. The protein forms a complex with the RAD50 homolog; this complex is required for nonhomologous joining of DNA ends and possesses increased single-stranded DNA endonuclease and 3' to 5' exonuclease activities. In conjunction with a DNA ligase, this protein promotes the joining of noncomplementary ends in vitro using short homologies near the ends of the DNA fragments. This gene has a pseudogene on chromosome 3. Alternative splicing of this gene results in two transcript variants encoding different isoforms. [provided by RefSeq, Jul 2008]

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
MRE11	NM_005591.4	c.775C>G	p.Gln259Glu	missense_variant	8/20	ENST00000323929.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MRE11	ENST00000323929.8	c.775C>G	p.Gln259Glu	missense_variant	8/20	1	NM_005591.4	P3
MRE11	ENST00000323977.7	c.775C>G	p.Gln259Glu	missense_variant	8/19	1
MRE11	ENST00000407439.7	c.784C>G	p.Gln262Glu	missense_variant	8/20	2
MRE11	ENST00000393241.8	c.775C>G	p.Gln259Glu	missense_variant	8/20	5		A1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Hereditary cancer-predisposing syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jul 03, 2018

The p.Q259E variant (also known as c.775C>G), located in coding exon 7 of the MRE11A gene, results from a C to G substitution at nucleotide position 775. The glutamine at codon 259 is replaced by glutamic acid, an amino acid with highly similar properties. This amino acid position is highly 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. -

Ataxia-telangiectasia-like disorder Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Aug 20, 2021

This sequence change replaces glutamine with glutamic acid at codon 259 of the MRE11 protein (p.Gln259Glu). The glutamine residue is moderately conserved and there is a small physicochemical difference between glutamine and glutamic acid. This variant is not present in population databases (ExAC no frequency). This variant has not been reported in the literature in individuals affected with MRE11-related conditions. 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 tolerated. 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	Benign	0.23
BayesDel_addAF	Uncertain	0.084	D
BayesDel_noAF	Benign	-0.12
Cadd	Uncertain	25
Dann	Uncertain	0.99
DEOGEN2	Benign	0.16	T;.;.;.
Eigen	Uncertain	0.26
Eigen_PC	Uncertain	0.39
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Benign	0.84	T;T;D;T
M_CAP	Benign	0.032	D
MetaRNN	Uncertain	0.59	D;D;D;D
MetaSVM	Benign	-0.58	T
MutationAssessor	Benign	1.9	L;.;L;.
MutationTaster	Benign	1.0	D;D;D;D
PrimateAI	Uncertain	0.68	T
PROVEAN	Benign	-1.5	N;N;N;N
REVEL	Benign	0.23
Sift	Benign	0.079	T;T;T;T
Sift4G	Benign	0.20	T;T;T;T
Polyphen		0.84	P;.;B;.
Vest4		0.63
MutPred		0.47		.;Gain of phosphorylation at Y265 (P = 0.1182);.;.;
MVP		0.67
MPC		0.11
ClinPred		0.83	D
GERP RS		5.5
Varity_R		0.48
gMVP		0.47

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: rs1060501788; hg19: chr11-94204810;