NM_002168.4:c.1255A>G

Variant names:

• chr15-90084832-T-C
• rs1423721679
• NM_002168.4:c.1255A>G

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4 BS2_Supporting

The NM_002168.4(IDH2):​c.1255A>G​(p.Ile419Val) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000342 in 1,461,670 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000034 (0 hom.)
• Consequence: IDH2 NM_002168.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 8.00
• Publications: 0 publications found

Genes affected

IDH2 (HGNC:5383): (isocitrate dehydrogenase (NADP(+)) 2) Isocitrate dehydrogenases catalyze the oxidative decarboxylation of isocitrate to 2-oxoglutarate. These enzymes belong to two distinct subclasses, one of which utilizes NAD(+) as the electron acceptor and the other NADP(+). Five isocitrate dehydrogenases have been reported: three NAD(+)-dependent isocitrate dehydrogenases, which localize to the mitochondrial matrix, and two NADP(+)-dependent isocitrate dehydrogenases, one of which is mitochondrial and the other predominantly cytosolic. Each NADP(+)-dependent isozyme is a homodimer. The protein encoded by this gene is the NADP(+)-dependent isocitrate dehydrogenase found in the mitochondria. It plays a role in intermediary metabolism and energy production. This protein may tightly associate or interact with the pyruvate dehydrogenase complex. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Feb 2014]

IDH2 Gene-Disease associations (from GenCC):

• mitochondrial disease

  Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
• d-2-hydroxyglutaric aciduria 2

  Inheritance: AD Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
• D-2-hydroxyglutaric aciduria

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.32506853).
• BS2: High AC in GnomAdExome4 at 5 AD gene. Variant has AC lower than other variant known as pathogenic in the gene, so the strength is limited to Supporting.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_002168.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	IDH2	NM_002168.4	MANE Select	c.1255A>G	p.Ile419Val	missense	Exon 10 of 11	NP_002159.2
	IDH2	NM_001289910.1		c.1099A>G	p.Ile367Val	missense	Exon 10 of 11	NP_001276839.1	P48735-2
	IDH2	NM_001290114.2		c.865A>G	p.Ile289Val	missense	Exon 8 of 9	NP_001277043.1	B4DSZ6

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	IDH2	ENST00000330062.8	TSL:1 MANE Select	c.1255A>G	p.Ile419Val	missense	Exon 10 of 11	ENSP00000331897.4	P48735-1
	IDH2	ENST00000864224.1		c.1339A>G	p.Ile447Val	missense	Exon 11 of 12	ENSP00000534283.1
	IDH2	ENST00000864227.1		c.1324A>G	p.Ile442Val	missense	Exon 11 of 12	ENSP00000534286.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD2 exomes AF: 0.00000398 AC: 1 AN: 251370 AF XY: 0.00000736

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: 0.00000879

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000342 AC: 5 AN: 1461670 Hom.: 0 Cov.: 32 AF XY: 0.00000413 AC XY: 3 AN XY: 727166

African (AFR) AF: 0.00 AC: 0 AN: 33478

American (AMR) AF: 0.00 AC: 0 AN: 44724

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26136

East Asian (EAS) AF: 0.00 AC: 0 AN: 39700

South Asian (SAS) AF: 0.0000232 AC: 2 AN: 86258

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53252

Middle Eastern (MID) AF: 0.000173 AC: 1 AN: 5768

European-Non Finnish (NFE) AF: 0.00000180 AC: 2 AN: 1111960

Other (OTH) AF: 0.00 AC: 0 AN: 60394

GnomAD4 genome Cov.: 32

Alfa AF: 0.000111 Hom.: 0

EpiCase AF: 0.0000545

EpiControl AF: 0.00

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	1	-	D-2-hydroxyglutaric aciduria 2 (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.099
BayesDel_addAF	Uncertain	0.034	T
BayesDel_noAF	Benign	-0.19
CADD	Uncertain	23
DANN	Benign	0.97
DEOGEN2	Benign	0.34	T
Eigen	Benign	-0.16
Eigen_PC	Benign	0.035
FATHMM_MKL	Pathogenic	0.97	D
LIST_S2	Uncertain	0.96	D
M_CAP	Benign	0.024	T
MetaRNN	Benign	0.33	T
MetaSVM	Benign	-0.75	T
MutationAssessor	Benign	0.34	N
PhyloP100		8.0
PrimateAI	Uncertain	0.76	T
PROVEAN	Benign	-0.53	N
REVEL	Uncertain	0.29
Sift	Benign	0.29	T
Sift4G	Benign	0.42	T
Polyphen		0.011	B
Vest4		0.61
MutPred		0.41		Loss of catalytic residue at I419 (P = 0.1607)
MVP		0.73
MPC		0.43
ClinPred		0.37	T
GERP RS		5.6
Varity_R		0.26
gMVP		0.70

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.060		Details are displayed if max score is > 0.2

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

Other links and lift over

dbSNP: rs1423721679; hg19: chr15-90628064;