2-219077253-T-G

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_024782.3(NHEJ1):c.818A>C(p.Glu273Ala) 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: 32)
• Consequence: NHEJ1 NM_024782.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.85

Genes affected

NHEJ1 (HGNC:25737): (non-homologous end joining factor 1) Double-strand breaks in DNA result from genotoxic stresses and are among the most damaging of DNA lesions. This gene encodes a DNA repair factor essential for the nonhomologous end-joining pathway, which preferentially mediates repair of double-stranded breaks. Mutations in this gene cause different kinds of severe combined immunodeficiency disorders. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.07407364).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
NHEJ1	NM_024782.3	c.818A>C	p.Glu273Ala	missense_variant	7/8	ENST00000356853.10
NHEJ1	NM_001377499.1	c.833A>C	p.Glu278Ala	missense_variant	7/8
NHEJ1	NM_001377498.1	c.818A>C	p.Glu273Ala	missense_variant	7/8
NHEJ1	NR_165304.1	n.996A>C		non_coding_transcript_exon_variant	8/9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
NHEJ1	ENST00000356853.10	c.818A>C	p.Glu273Ala	missense_variant	7/8	1	NM_024782.3	P4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Cernunnos-XLF deficiency Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Jul 31, 2021

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. 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. This variant has not been reported in the literature in individuals affected with NHEJ1-related conditions. This variant is not present in population databases (ExAC no frequency). This sequence change replaces glutamic acid with alanine at codon 273 of the NHEJ1 protein (p.Glu273Ala). The glutamic acid residue is moderately conserved and there is a moderate physicochemical difference between glutamic acid and alanine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.076
BayesDel_addAF	Benign	-0.14	T
BayesDel_noAF	Benign	-0.44
Cadd	Benign	14
Dann	Benign	0.92
Eigen	Benign	-0.77
Eigen_PC	Benign	-0.79
FATHMM_MKL	Benign	0.27	N
LIST_S2	Benign	0.52	T;T;T
M_CAP	Benign	0.014	T
MetaRNN	Benign	0.074	T;T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	1.6	L;L;.
MutationTaster	Benign	1.0	N;N
PrimateAI	Benign	0.34	T
PROVEAN	Benign	-0.64	N;N;N
REVEL	Benign	0.10
Sift	Uncertain	0.012	D;T;T
Sift4G	Benign	0.15	T;T;T
Polyphen		0.16	.;B;.
Vest4		0.30
MutPred		0.050		Loss of solvent accessibility (P = 0.0769);Loss of solvent accessibility (P = 0.0769);.;
MVP		0.67
MPC		0.053
ClinPred		0.12	T
GERP RS		3.4
Varity_R		0.046
gMVP		0.17

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr2-219941975;