Genetic Variant ME2:p.Ile242Val (chr18-50918203-A-G) – ACMG Classification: Likely_benign (-2 pts)

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2BP4_Strong

The NM_002396.5(ME2):c.724A>G(p.Ile242Val) variant causes a missense change. The variant allele was found at a frequency of 0.0000206 in 1,599,098 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000022 ( 0 hom. )

Consequence

ME2
NM_002396.5 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 4.93

Variant links:

Genes affected

ME2 (HGNC:6984): (malic enzyme 2) This gene encodes a mitochondrial NAD-dependent malic enzyme, a homotetrameric protein, that catalyzes the oxidative decarboxylation of malate to pyruvate. It had previously been weakly linked to a syndrome known as Friedreich ataxia that has since been shown to be the result of mutation in a completely different gene. Certain single-nucleotide polymorphism haplotypes of this gene have been shown to increase the risk for idiopathic generalized epilepsy. Alternatively spliced transcript variants encoding different isoforms found for this gene. [provided by RefSeq, Dec 2009]

ME2 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.029809028).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ME2	NM_002396.5 link	c.724A>G	p.Ile242Val	missense_variant	Exon 7 of 16	ENST00000321341.11	NP_002387.1	P23368-1
ME2	NM_001168335.2 link	c.724A>G	p.Ile242Val	missense_variant	Exon 7 of 14		NP_001161807.1	P23368-2
ME2	NR_174094.1 link	n.927A>G		non_coding_transcript_exon_variant	Exon 7 of 15

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ME2	ENST00000321341.11 link	c.724A>G	p.Ile242Val	missense_variant	Exon 7 of 16	1	NM_002396.5	ENSP00000321070.5		P23368-1

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152182

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000192

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000927

AC:

AN:

248128

Hom.:

AF XY:

0.0000746

AC XY:

AN XY:

134110

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.000772

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000799

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000221

AC:

AN:

1446798

Hom.:

Cov.:

AF XY:

0.0000222

AC XY:

AN XY:

719556

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.000329

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000154

Gnomad4 OTH exome

AF:

0.0000335

GnomAD4 genome

AF:

0.00000657

AC:

AN:

152300

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74482

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.000193

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000712

Hom.:

Bravo

AF:

0.0000491

ExAC

AF:

0.0000741

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Jan 26, 2025

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.724A>G (p.I242V) alteration is located in exon 7 (coding exon 6) of the ME2 gene. This alteration results from a A to G substitution at nucleotide position 724, causing the isoleucine (I) at amino acid position 242 to be replaced by a valine (V). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.070

BayesDel_addAF

Benign

-0.47

BayesDel_noAF

Benign

-0.53

CADD

Benign

DANN

Benign

0.60

DEOGEN2

Benign

0.025

T;.;.;.;.;.;.

Eigen

Benign

-0.46

Eigen_PC

Benign

-0.15

FATHMM_MKL

Uncertain

0.87

LIST_S2

Uncertain

0.91

D;D;D;D;D;D;D

M_CAP

Benign

0.0029

MetaRNN

Benign

0.030

T;T;T;T;T;T;T

MetaSVM

Benign

-1.0

MutationAssessor

Benign

-1.4

N;.;N;.;.;.;.

PrimateAI

Benign

0.37

PROVEAN

Benign

0.68

N;.;N;.;.;.;.

REVEL

Benign

0.058

Sift

Benign

1.0

T;.;T;.;.;.;.

Sift4G

Benign

1.0

T;.;T;.;.;.;.

Polyphen

0.0

B;.;.;.;.;.;.

Vest4

0.20

MutPred

0.49

Loss of ubiquitination at K240 (P = 0.1741);Loss of ubiquitination at K240 (P = 0.1741);Loss of ubiquitination at K240 (P = 0.1741);Loss of ubiquitination at K240 (P = 0.1741);Loss of ubiquitination at K240 (P = 0.1741);.;.;

MVP

0.27

MPC

0.26

ClinPred

0.096

GERP RS

5.3

Varity_R

0.15

gMVP

0.45

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over