2-241743648-G-A

Position:

• chr2-241743648-G-A

Variant summary

Our verdict is Likely benign. Variant got -5 ACMG points: 4P and 9B. PM1 PM2 BP4_Strong BP6 BS1

The NM_152783.5(D2HGDH):​c.517G>A​(p.Val173Ile) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000191 in 1,613,866 control chromosomes in the GnomAD database, including 1 homozygotes. 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 Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: 𝑓 0.00018 (1 hom., cov: 32)
  • Exomes 𝑓: 0.00019 (0 hom.)
• Consequence: D2HGDH NM_152783.5 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:2 B:3
• Conservation: PhyloP100: -0.191

Genes affected

D2HGDH (HGNC:28358): (D-2-hydroxyglutarate dehydrogenase) This gene encodes D-2hydroxyglutarate dehydrogenase, a mitochondrial enzyme belonging to the FAD-binding oxidoreductase/transferase type 4 family. This enzyme, which is most active in liver and kidney but also active in heart and brain, converts D-2-hydroxyglutarate to 2-ketoglutarate. Mutations in this gene are present in D-2-hydroxyglutaric aciduria, a rare recessive neurometabolic disorder causing developmental delay, epilepsy, hypotonia, and dysmorphic features. [provided by RefSeq, Jul 2008]

D2HGDH (HGNC:):

ACMG classification

Verdict is Likely_benign. Variant got -5 ACMG points.

• PM1: In a domain FAD-binding PCMH-type (size 179) in uniprot entity D2HDH_HUMAN there are 11 pathogenic changes around while only 1 benign (92%) in NM_152783.5
• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.025124699).
• BP6: Variant 2-241743648-G-A is Benign according to our data. Variant chr2-241743648-G-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 432634.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=2, Uncertain_significance=2}.
• BS1: Variant frequency is greater than expected in population eas. gnomad4 allele frequency = 0.000177 (27/152308) while in subpopulation EAS AF= 0.00463 (24/5182). AF 95% confidence interval is 0.00319. There are 1 homozygotes in gnomad4. There are 12 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
D2HGDH	NM_152783.5	c.517G>A	p.Val173Ile	missense_variant	5/10	ENST00000321264.9	NP_689996.4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
D2HGDH	ENST00000321264.9	c.517G>A	p.Val173Ile	missense_variant	5/10	1	NM_152783.5	ENSP00000315351.4

Frequencies

GnomAD3 genomes AF: 0.000177 AC: 27 AN: 152190 Hom.: 1 Cov.: 32

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.000288

Gnomad EAS AF: 0.00462

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000294

Gnomad OTH AF: 0.00

GnomAD3 exomes AF: 0.000453 AC: 113 AN: 249712 Hom.: 0 AF XY: 0.000392 AC XY: 53 AN XY: 135218

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00129

Gnomad EAS exome AF: 0.00506

Gnomad SAS exome AF: 0.0000328

Gnomad FIN exome AF: 0.0000473

Gnomad NFE exome AF: 0.0000266

Gnomad OTH exome AF: 0.000327

GnomAD4 exome AF: 0.000193 AC: 282 AN: 1461558 Hom.: 0 Cov.: 32 AF XY: 0.000182 AC XY: 132 AN XY: 727056

Gnomad4 AFR exome AF: 0.0000299

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00168

Gnomad4 EAS exome AF: 0.00481

Gnomad4 SAS exome AF: 0.0000696

Gnomad4 FIN exome AF: 0.0000375

Gnomad4 NFE exome AF: 0.0000189

Gnomad4 OTH exome AF: 0.000248

GnomAD4 genome AF: 0.000177 AC: 27 AN: 152308 Hom.: 1 Cov.: 32 AF XY: 0.000161 AC XY: 12 AN XY: 74486

Gnomad4 AFR AF: 0.00

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.000288

Gnomad4 EAS AF: 0.00463

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000294

Gnomad4 OTH AF: 0.00

Alfa AF: 0.000137 Hom.: 0

Bravo AF: 0.000189

ExAC AF: 0.000379 AC: 46

Asia WGS AF: 0.00202 AC: 7 AN: 3478

EpiCase AF: 0.0000545

EpiControl AF: 0.000119

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:2 Benign:3

Revision: criteria provided, conflicting classifications

Submissions by phenotype

D-2-hydroxyglutaric aciduria 1 Uncertain:1 Benign:2

Likely benign, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Jan 13, 2018	This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as likely benign is not then subjected to further curation. The score for this variant resulted in a classification of likely benign for this disease. -
Likely benign, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Nov 16, 2023	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Fulgent Genetics, Fulgent Genetics	Oct 31, 2018	- -

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

GeneDx

Jun 06, 2017

The V173I variant in the D2HGDH gene has not been reported previously as a pathogenic variant, nor as a benign variant, to our knowledge. The V173I variant is observed in 39/8506 (0.46%) alleles from individuals of East Asian background, in the ExAC dataset (Lek et al., 2016). The V173I variant is a conservative amino acid substitution, which is not likely to impact secondary protein structure as these residues share similar properties. This substitution occurs at a position where amino acids with similar properties to Valine are tolerated across species. In silico analysis predicts this variant likely does not alter the protein structure/function. We interpret V173I as a variant of uncertain significance. -

D2HGDH-related disorder Benign:1

Likely benign, no assertion criteria provided

clinical testing

PreventionGenetics, part of Exact Sciences

May 01, 2019

This variant is classified as likely benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.065
BayesDel_addAF	Benign	-0.34	T
BayesDel_noAF	Benign	-0.26
CADD	Benign	0.16
DANN	Benign	0.46
DEOGEN2	Benign	0.17	T;.
Eigen	Benign	-1.8
Eigen_PC	Benign	-1.8
FATHMM_MKL	Benign	0.052	N
LIST_S2	Benign	0.83	T;T
M_CAP	Pathogenic	0.67	D
MetaRNN	Benign	0.025	T;T
MetaSVM	Benign	-0.50	T
MutationAssessor	Benign	-0.55	N;.
PrimateAI	Benign	0.28	T
PROVEAN	Benign	-0.060	N;N
REVEL	Uncertain	0.34
Sift	Benign	1.0	T;T
Sift4G	Benign	1.0	T;T
Polyphen		0.0090	B;.
Vest4		0.088
MVP		0.38
MPC		0.32
ClinPred		0.0076	T
GERP RS		-5.1
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.014
gMVP		0.36

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

Other links and lift over

dbSNP: rs146408017; hg19: chr2-242683063;