rs121909734

Variant names:

• chr10-87053403-C-A
• rs121909734
• NM_005271.5:c.1496G>T

Your query was ambiguous. Multiple possible variants found:

• chr10-87053403-C-A
• chr10-87053403-C-G
• chr10-87053403-C-T

Variant summary

Our verdict is Pathogenic. Variant got 16 ACMG points: 16P and 0B. PM2 PM5 PP3_Strong PP5_Very_Strong

The NM_005271.5(GLUD1):​c.1496G>T​(p.Gly499Val) variant causes a missense, splice region change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. 14/23 in silico tools predict a damaging outcome for this variant. 2/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Pathogenic (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. G499C) has been classified as Pathogenic.

• Frequency: Genomes: not found (cov: 32)
• Consequence: GLUD1 NM_005271.5 missense, splice_region
• Scores: Splicing: ADA: 0.9750
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:3
• Conservation: PhyloP100: 7.54

Genes affected

GLUD1 (HGNC:4335): (glutamate dehydrogenase 1) This gene encodes glutamate dehydrogenase, which is a mitochondrial matrix enzyme that catalyzes the oxidative deamination of glutamate to alpha-ketoglutarate and ammonia. This enzyme has an important role in regulating amino acid-induced insulin secretion. It is allosterically activated by ADP and inhibited by GTP and ATP. Activating mutations in this gene are a common cause of congenital hyperinsulinism. Alternative splicing of this gene results in multiple transcript variants. The related glutamate dehydrogenase 2 gene on the human X-chromosome originated from this gene via retrotransposition and encodes a soluble form of glutamate dehydrogenase. Related pseudogenes have been identified on chromosomes 10, 18 and X. [provided by RefSeq, Jan 2016]

ACMG classification

Verdict is Pathogenic. Variant got 16 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr10-87053404-C-A is described in Lovd as [Pathogenic].
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.986
• PP5: Variant 10-87053403-C-A is Pathogenic according to our data. Variant chr10-87053403-C-A is described in ClinVar as [Pathogenic]. Clinvar id is 226111.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
GLUD1	NM_005271.5	c.1496G>T	p.Gly499Val	missense_variant, splice_region_variant	Exon 12 of 13	ENST00000277865.5	NP_005262.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
GLUD1	ENST00000277865.5	c.1496G>T	p.Gly499Val	missense_variant, splice_region_variant	Exon 12 of 13	1	NM_005271.5	ENSP00000277865.4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 28

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Hyperinsulinism-hyperammonemia syndrome Pathogenic:3

Oct 07, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces glycine, which is neutral and non-polar, with valine, which is neutral and non-polar, at codon 499 of the GLUD1 protein (p.Gly499Val). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individual(s) with familial hyperinsulinism (PMID: 10871207, 35951311). In at least one individual the variant was observed to be de novo. This variant is also known as GDH-G446V. ClinVar contains an entry for this variant (Variation ID: 226111). An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant is likely to be disruptive. Experimental studies have shown that this missense change affects GLUD1 function (PMID: 32143698). This variant disrupts the p.Gly499 amino acid residue in GLUD1. Other variant(s) that disrupt this residue have been observed in individuals with GLUD1-related conditions (PMID: 9571255, 10871207, 18928469, 19046187, 30352420), which suggests that this may be a clinically significant amino acid residue. For these reasons, this variant has been classified as Pathogenic. -

Dec 18, 2024

Genomic Medicine Center of Excellence, King Faisal Specialist Hospital and Research Centre

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Feb 22, 2016

Center of Genomic medicine, Geneva, University Hospital of Geneva

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Pathogenic mutations in the GLUD1 gene are known to cause the hyperinsulinism-hyperammonemia syndrome. Another variant in the same codon (p.(Gly499Ser)) has been reported to cause the same pathology. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.98
BayesDel_addAF	Pathogenic	0.55	D
BayesDel_noAF	Pathogenic	0.55
CADD	Pathogenic	32
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.88	D
Eigen	Pathogenic	0.82
Eigen_PC	Pathogenic	0.78
FATHMM_MKL	Pathogenic	0.97	D
LIST_S2	Uncertain	0.93	D
M_CAP	Pathogenic	0.50	D
MetaRNN	Pathogenic	0.99	D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Pathogenic	3.9	H
PrimateAI	Pathogenic	0.81	D
PROVEAN	Pathogenic	-7.7	D
REVEL	Pathogenic	0.94
Sift	Uncertain	0.0010	D
Sift4G	Uncertain	0.0020	D
Polyphen		0.98	D
Vest4		0.99
MutPred		0.89		Loss of loop (P = 0.0073);
MVP		0.99
MPC		2.1
ClinPred		1.0	D
GERP RS		5.6
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.92
gMVP		0.98

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	0.97
dbscSNV1_RF	Pathogenic	0.90
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: rs121909734; hg19: chr10-88813160;