14-75002993-G-A

Variant names:

• chr14-75002993-G-A
• rs767933078
• NM_014239.4:c.3G>A

Variant summary

Our verdict is Uncertain significance. Variant got 5 ACMG points: 5P and 0B. PVS1_Supporting PM2 PP5_Moderate

The NM_014239.4(EIF2B2):​c.3G>A​(p.Met1?) variant causes a start lost change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 1,461,756 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: EIF2B2 NM_014239.4 start_lost
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 8.55

Genes affected

EIF2B2 (HGNC:3258): (eukaryotic translation initiation factor 2B subunit beta) This gene encodes the beta subunit of eukaryotic initiation factor-2B (EIF2B). EIF2B is involved in protein synthesis and exchanges GDP and GTP for its activation and deactivation. [provided by RefSeq, Aug 2011]

ACMG classification

Verdict is Uncertain_significance. Variant got 5 ACMG points.

• PVS1: Start lost variant, no pathogenic variants between lost start and next in-frame start position. Next in-frame start position is after 34 codons. Genomic position: 75003090. Lost 0.095 part of the original CDS.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 14-75002993-G-A is Pathogenic according to our data. Variant chr14-75002993-G-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 984938.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
EIF2B2	NM_014239.4	c.3G>A	p.Met1?	start_lost	Exon 1 of 8	ENST00000266126.10	NP_055054.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
EIF2B2	ENST00000266126.10	c.3G>A	p.Met1?	start_lost	Exon 1 of 8	1	NM_014239.4	ENSP00000266126.5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1461756 Hom.: 0 Cov.: 33 AF XY: 0.00000138 AC XY: 1 AN XY: 727184

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 8.99e-7

Gnomad4 OTH exome AF: 0.0000166

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000378

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Vanishing white matter disease Pathogenic:1

Feb 20, 2020

Rady Children's Institute for Genomic Medicine, Rady Children's Hospital San Diego

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This start lost variant affects the translation initiation codon (Met1) and is therefore predicted to result in loss of normal protein function. This variant has not been previously reported or functionally characterized in the literature to our knowledge. A different variant at the same amino acid residue, c.3G>T (p.Met1Ile), is known to ClinVar and has been classified as Pathogenic (Variation ID: 280422). This variant is absent from the ExAC and gnomAD population databases and thus is presumed to be rare. Based on the available evidence, the c.3G>A (p.Met1?) variant is classified as Likely Pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Pathogenic	0.17
CADD	Uncertain	24
DANN	Uncertain	1.0
DEOGEN2	Benign	0.13	T
Eigen	Pathogenic	0.72
Eigen_PC	Pathogenic	0.72
FATHMM_MKL	Uncertain	0.97	D
LIST_S2	Uncertain	0.90	D
M_CAP	Uncertain	0.21	D
MetaRNN	Pathogenic	0.98	D
MetaSVM	Uncertain	0.72	D
PROVEAN	Benign	-1.4	N
REVEL	Uncertain	0.64
Sift	Pathogenic	0.0	D
Sift4G	Uncertain	0.049	D
Polyphen		0.94	P
Vest4		0.80
MutPred		0.95		Gain of catalytic residue at P2 (P = 0);
MVP		0.99
ClinPred		1.0	D
GERP RS		5.9
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.96
gMVP		0.65

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: rs767933078; hg19: chr14-75469696;