chr18-50912893-A-G

Position:

• chr18-50912893-A-G

Variant summary

Our verdict is Likely pathogenic. Variant got 8 ACMG points: 8P and 0B. PM1 PM2 PP3_Strong

The NM_002396.5(ME2):​c.335A>G​(p.Tyr112Cys) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000685 in 1,460,150 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 Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: ME2 NM_002396.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 9.32

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 (HGNC:):

ACMG classification

Verdict is Likely_pathogenic. Variant got 8 ACMG points.

• PM1: In a active_site Proton donor (size 0) in uniprot entity MAOM_HUMAN
• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.983

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
ME2	NM_002396.5	c.335A>G	p.Tyr112Cys	missense_variant	4/16	ENST00000321341.11	NP_002387.1
ME2	NM_001168335.2	c.335A>G	p.Tyr112Cys	missense_variant	4/14		NP_001161807.1
ME2	NR_174094.1	n.538A>G		non_coding_transcript_exon_variant	4/15

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
ME2	ENST00000321341.11	c.335A>G	p.Tyr112Cys	missense_variant	4/16	1	NM_002396.5	ENSP00000321070.5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.85e-7 AC: 1 AN: 1460150 Hom.: 0 Cov.: 30 AF XY: 0.00 AC XY: 0 AN XY: 726452

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: 0.0000187

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

May 13, 2024

The c.335A>G (p.Y112C) alteration is located in exon 4 (coding exon 3) of the ME2 gene. This alteration results from a A to G substitution at nucleotide position 335, causing the tyrosine (Y) at amino acid position 112 to be replaced by a cysteine (C). 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	Pathogenic	0.93
BayesDel_addAF	Pathogenic	0.38	D
BayesDel_noAF	Pathogenic	0.31
CADD	Pathogenic	28
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.45	T;.;.;.;.;.;.
Eigen	Pathogenic	1.1
Eigen_PC	Pathogenic	0.94
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Pathogenic	0.99	D;D;D;D;D;D;D
M_CAP	Uncertain	0.13	D
MetaRNN	Pathogenic	0.98	D;D;D;D;D;D;D
MetaSVM	Uncertain	0.47	D
MutationAssessor	Pathogenic	4.1	H;.;H;.;.;.;.
PrimateAI	Pathogenic	0.89	D
PROVEAN	Pathogenic	-8.9	D;.;D;.;.;.;.
REVEL	Pathogenic	0.73
Sift	Pathogenic	0.0	D;.;D;.;.;.;.
Sift4G	Pathogenic	0.0	D;.;D;.;.;.;.
Polyphen		1.0	D;.;.;.;.;.;.
Vest4		0.83
MutPred		0.95		Loss of catalytic residue at L107 (P = 0.0852);Loss of catalytic residue at L107 (P = 0.0852);Loss of catalytic residue at L107 (P = 0.0852);Loss of catalytic residue at L107 (P = 0.0852);Loss of catalytic residue at L107 (P = 0.0852);Loss of catalytic residue at L107 (P = 0.0852);.;
MVP		0.91
MPC		1.2
ClinPred		1.0	D
GERP RS		5.4
Varity_R		0.96
gMVP		0.97

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		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: chr18-48439263;