2-208248468-G-C

Variant names:

• chr2-208248468-G-C
• rs11554137
• NM_005896.4:c.315C>G

Variant summary

Our verdict is Likely benign. The variant received -5 ACMG points: 2P and 7B. PM2 BP4_Strong BP6_Moderate BP7

The NM_005896.4(IDH1):​c.315C>G​(p.Gly105Gly) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★). Synonymous variant affecting the same amino acid position (i.e. G105G) has been classified as Benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: IDH1 NM_005896.4 synonymous
• Clinical Significance: Likely benign criteria provided, single submitter B:1
• Conservation: PhyloP100: 1.35
• Publications: 0 publications found

Genes affected

IDH1 (HGNC:5382): (isocitrate dehydrogenase (NADP(+)) 1) 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 cytoplasm and peroxisomes. It contains the PTS-1 peroxisomal targeting signal sequence. The presence of this enzyme in peroxisomes suggests roles in the regeneration of NADPH for intraperoxisomal reductions, such as the conversion of 2, 4-dienoyl-CoAs to 3-enoyl-CoAs, as well as in peroxisomal reactions that consume 2-oxoglutarate, namely the alpha-hydroxylation of phytanic acid. The cytoplasmic enzyme serves a significant role in cytoplasmic NADPH production. Alternatively spliced transcript variants encoding the same protein have been found for this gene. [provided by RefSeq, Sep 2013]

IDH1 Gene-Disease associations (from GenCC):

• Maffucci syndrome

  Inheritance: AD Classification: LIMITED Submitted by: Ambry Genetics

ACMG classification

Our verdict: Likely_benign. The variant received -5 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.56).
• BP6: Variant 2-208248468-G-C is Benign according to our data. Variant chr2-208248468-G-C is described in ClinVar as Likely_benign. ClinVar VariationId is 1728275.Status of the report is criteria_provided_single_submitter, 1 stars.
• BP7: Synonymous conserved (PhyloP=1.35 with no splicing effect.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_005896.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	IDH1	NM_005896.4	MANE Select	c.315C>G	p.Gly105Gly	synonymous	Exon 4 of 10	NP_005887.2
	IDH1	NM_001282386.1		c.315C>G	p.Gly105Gly	synonymous	Exon 4 of 10	NP_001269315.1
	IDH1	NM_001282387.1		c.315C>G	p.Gly105Gly	synonymous	Exon 4 of 10	NP_001269316.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	IDH1	ENST00000345146.7	TSL:1 MANE Select	c.315C>G	p.Gly105Gly	synonymous	Exon 4 of 10	ENSP00000260985.2
	IDH1	ENST00000415913.5	TSL:1	c.315C>G	p.Gly105Gly	synonymous	Exon 4 of 10	ENSP00000390265.1
	IDH1	ENST00000446179.5	TSL:1	c.315C>G	p.Gly105Gly	synonymous	Exon 4 of 10	ENSP00000410513.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 32

ClinVar

ClinVar submissions as Germline

Significance: Likely benign

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	-	1	not specified (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.56
CADD	Benign	5.3
DANN	Benign	0.70
PhyloP100		1.4
Mutation Taster		=94/6	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs11554137; hg19: chr2-209113192;