Genetic Variant L2HGDH:p.Gly429Arg (chr14-50247165-C-T) – ACMG Classification: Likely_pathogenic (6 pts)

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM2PP3_Strong

The NM_024884.3(L2HGDH):c.1285G>A(p.Gly429Arg) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,868 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: 33)

Exomes 𝑓: 6.8e-7 ( 0 hom. )

Consequence

L2HGDH
NM_024884.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 7.88

Variant links:

Genes affected

L2HGDH (HGNC:20499): (L-2-hydroxyglutarate dehydrogenase) This gene encodes L-2-hydroxyglutarate dehydrogenase, a FAD-dependent enzyme that oxidizes L-2-hydroxyglutarate to alpha-ketoglutarate in a variety of mammalian tissues. Mutations in this gene cause L-2-hydroxyglutaric aciduria, a rare autosomal recessive neurometabolic disorder resulting in moderate to severe cognitive disability. [provided by RefSeq, Jul 2008]

L2HGDH links:

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ACMG classification

Classification made for transcript

Verdict is Likely_pathogenic. Variant got 6 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.948

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
L2HGDH	NM_024884.3 link	c.1285G>A	p.Gly429Arg	missense_variant	Exon 10 of 10	ENST00000267436.9	NP_079160.1	Q9H9P8-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
L2HGDH	ENST00000267436.9 link	c.1285G>A	p.Gly429Arg	missense_variant	Exon 10 of 10	1	NM_024884.3	ENSP00000267436.4	Q9H9P8-1
L2HGDH	ENST00000261699.8 link	c.1197-9440G>A		intron_variant	Intron 9 of 9	1		ENSP00000261699.4	C9JVN9
L2HGDH	ENST00000421284.7 link	c.1285G>A	p.Gly429Arg	missense_variant	Exon 10 of 11	2		ENSP00000405559.3	Q9H9P8-1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD3 exomes

AF:

0.00000398

AC:

AN:

251284

Hom.:

AF XY:

0.00

AC XY:

AN XY:

135814

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000289

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

6.84e-7

AC:

AN:

1461868

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

727234

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000224

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

Cov.:

ExAC

AF:

0.00000824

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

L-2-hydroxyglutaric aciduria

Uncertain:1

Sep 27, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces glycine, which is neutral and non-polar, with arginine, which is basic and polar, at codon 429 of the L2HGDH protein (p.Gly429Arg). This variant is present in population databases (rs751508205, gnomAD 0.003%). In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt L2HGDH protein function. ClinVar contains an entry for this variant (Variation ID: 1436029). This variant has not been reported in the literature in individuals affected with L2HGDH-related conditions. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.39

BayesDel_addAF

Uncertain

0.15

BayesDel_noAF

Uncertain

0.060

CADD

Uncertain

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.46

T;T

Eigen

Uncertain

0.30

Eigen_PC

Uncertain

0.24

FATHMM_MKL

Pathogenic

0.98

LIST_S2

Uncertain

0.96

.;D

M_CAP

Uncertain

0.15

MetaRNN

Pathogenic

0.95

D;D

MetaSVM

Uncertain

0.022

MutationAssessor

Uncertain

2.5

M;M

PrimateAI

Uncertain

0.57

PROVEAN

Pathogenic

-4.5

D;D

REVEL

Pathogenic

0.73

Sift

Uncertain

0.0030

D;D

Sift4G

Uncertain

0.0050

D;D

Polyphen

0.97

D;D

Vest4

0.66

MutPred

0.77

Gain of catalytic residue at G424 (P = 0.0013);Gain of catalytic residue at G424 (P = 0.0013);

MVP

0.84

MPC

0.87

ClinPred

0.99

GERP RS

4.5

Varity_R

0.61

gMVP

0.89

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