chr20-63495056-C-T

Position:

• chr20-63495056-C-T

Variant summary

Our verdict is Pathogenic. Variant got 13 ACMG points: 13P and 0B. PM2 PP2 PP3_Moderate PP5_Very_Strong

The NM_001958.5(EEF1A2):​c.370G>A​(p.Glu124Lys) variant causes a missense change involving the alteration of a conserved nucleotide. 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 Likely pathogenic (★★).

• Frequency: Genomes: not found (cov: 34)
• Consequence: EEF1A2 NM_001958.5 missense
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:7
• Conservation: PhyloP100: 7.80

Genes affected

EEF1A2 (HGNC:3192): (eukaryotic translation elongation factor 1 alpha 2) This gene encodes an isoform of the alpha subunit of the elongation factor-1 complex, which is responsible for the enzymatic delivery of aminoacyl tRNAs to the ribosome. This isoform (alpha 2) is expressed in brain, heart and skeletal muscle, and the other isoform (alpha 1) is expressed in brain, placenta, lung, liver, kidney, and pancreas. This gene may be critical in the development of ovarian cancer. [provided by RefSeq, Mar 2014]

ACMG classification

Verdict is Pathogenic. Variant got 13 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), EEF1A2. . Gene score misZ: 4.8166 (greater than the threshold 3.09). Trascript score misZ: 6.0564 (greater than threshold 3.09). The gene has 34 curated pathogenic missense variants (we use a threshold of 10). The gene has 12 curated benign missense variants. GenCC has associacion of the gene with autosomal dominant non-syndromic intellectual disability, undetermined early-onset epileptic encephalopathy, complex neurodevelopmental disorder, developmental and epileptic encephalopathy, 33.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.916
• PP5: Variant 20-63495056-C-T is Pathogenic according to our data. Variant chr20-63495056-C-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 280924.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
EEF1A2	NM_001958.5	c.370G>A	p.Glu124Lys	missense_variant	4/8	ENST00000217182.6	NP_001949.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
EEF1A2	ENST00000217182.6	c.370G>A	p.Glu124Lys	missense_variant	4/8	1	NM_001958.5	ENSP00000217182.3

Frequencies

GnomAD3 genomes Cov.: 34

GnomAD4 exome Cov.: 35

GnomAD4 genome Cov.: 34

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:7

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Pathogenic:3

Likely pathogenic, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Feb 01, 2018	- -
Pathogenic, criteria provided, single submitter	clinical testing	GeneDx	Jun 04, 2018	The E124K variant in the EEF1A2 gene has been reported previously as a de novo variant in an individual with epilepsy and developmental delay (Lam et al., 2016). The E124K variant is not observed in large population cohorts (Lek et al., 2016). The E124K variant is a non-conservative amino acid substitution, which is likely to impact secondary protein structure as these residues differ in polarity, charge, size and/or other properties. This substitution occurs at a position that is conserved across species. In silico analysis predicts this variant is probably damaging to the protein structure/function. We interpret E124K as a pathogenic variant. -
Pathogenic, no assertion criteria provided	clinical testing	Department of Genetics, Robert DEBRE University Hospital	Apr 26, 2018	- -

Developmental and epileptic encephalopathy, 33 Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 22, 2024	This sequence change replaces glutamic acid, which is acidic and polar, with lysine, which is basic and polar, at codon 124 of the EEF1A2 protein (p.Glu124Lys). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individual(s) with clinical features of developmental and epileptic encephalopathy (PMID: 27441201, 33004838; Invitae). In at least one individual the variant was observed to be de novo. ClinVar contains an entry for this variant (Variation ID: 280924). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) has been performed at Invitae for this missense variant, however the output from this modeling did not meet the statistical confidence thresholds required to predict the impact of this variant on EEF1A2 protein function. For these reasons, this variant has been classified as Pathogenic. -
Likely pathogenic, criteria provided, single submitter	clinical testing	Equipe Genetique des Anomalies du Developpement, Université de Bourgogne	Jan 01, 2015	- -

Developmental and epileptic encephalopathy, 33;C4225343:Intellectual disability, autosomal dominant 38 Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Fulgent Genetics, Fulgent Genetics

Jul 06, 2021

- -

Intellectual disability Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Diagnostic Laboratory, Strasbourg University Hospital

Sep 10, 2020

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.19	D
BayesDel_noAF	Uncertain	0.040
CADD	Pathogenic	33
DANN	Pathogenic	1.0
DEOGEN2	Pathogenic	0.82	D;.;.
Eigen	Uncertain	0.45
Eigen_PC	Uncertain	0.43
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Uncertain	0.93	D;D;D
M_CAP	Uncertain	0.20	D
MetaRNN	Pathogenic	0.92	D;D;D
MetaSVM	Uncertain	-0.24	T
MutationAssessor	Pathogenic	3.1	M;.;.
PrimateAI	Pathogenic	0.92	D
PROVEAN	Uncertain	-3.5	D;.;.
REVEL	Uncertain	0.62
Sift	Uncertain	0.016	D;.;.
Sift4G	Pathogenic	0.0010	D;.;.
Polyphen		0.10	B;.;.
Vest4		0.94
MutPred		0.82		Gain of methylation at E124 (P = 0.0017);Gain of methylation at E124 (P = 0.0017);Gain of methylation at E124 (P = 0.0017);
MVP		0.65
MPC		3.1
ClinPred		0.99	D
GERP RS		3.9
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.49
gMVP		1.0

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: rs886042041; hg19: chr20-62126409;