Genetic Variant EEF1A2:p.Gly446_Gly447dup (chr20-63488347-G-GCGCCGC) – ACMG Classification: Uncertain_significance (4 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 4P and 0B. PM2PM4

The NM_001958.5(EEF1A2):c.1337_1342dupGCGGCG(p.Gly446_Gly447dup) variant causes a conservative inframe insertion change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000759 in 1,318,162 control chromosomes in the GnomAD database, with no homozygous occurrence. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. A448A) has been classified as Likely benign.

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 7.6e-7 ( 0 hom. )

Consequence

EEF1A2
NM_001958.5 conservative_inframe_insertion

Scores

Not classified

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 0.971

Publications

0 publications found

Variant links:

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]

EEF1A2 Gene-Disease associations (from GenCC):

complex neurodevelopmental disorder
Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
developmental and epileptic encephalopathy, 33
Inheritance: AD Classification: STRONG, MODERATE Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics, G2P
autosomal dominant non-syndromic intellectual disability
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
undetermined early-onset epileptic encephalopathy
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

EEF1A2 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 4 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PM4

Nonframeshift variant in NON repetitive region in NM_001958.5.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
EEF1A2	NM_001958.5 link	c.1337_1342dupGCGGCG	p.Gly446_Gly447dup	conservative_inframe_insertion	Exon 8 of 8	ENST00000217182.6	NP_001949.1	Q05639

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
EEF1A2	ENST00000217182.6 link	c.1337_1342dupGCGGCG	p.Gly446_Gly447dup	conservative_inframe_insertion	Exon 8 of 8	1	NM_001958.5	ENSP00000217182.3		Q05639

Frequencies

GnomAD3 genomes

Cov.:

GnomAD2 exomes

AF:

0.0000110

AC:

AN:

90978

AF XY:

0.0000195

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000289

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

7.59e-7

AC:

AN:

1318162

Hom.:

Cov.:

AF XY:

0.00000154

AC XY:

AN XY:

649974

show subpopulations

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.00

AC:

AN:

26594

American (AMR)

AF:

0.00

AC:

AN:

26166

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

23092

East Asian (EAS)

AF:

0.00

AC:

AN:

27864

South Asian (SAS)

AF:

0.00

AC:

AN:

72474

European-Finnish (FIN)

AF:

0.00

AC:

AN:

39392

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5050

European-Non Finnish (NFE)

AF:

9.58e-7

AC:

AN:

1043468

Other (OTH)

AF:

0.00

AC:

AN:

54062

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.000000), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.325

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

PhyloP100

0.97

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Computational scores

Splicing

Publications

Other links and lift over