chr19-12897786-TG-T

Position:

• chr19-12897786-TG-T

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The ENST00000222214.10(GCDH):​c.1173delG​(p.Asn392fs) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000682 in 1,612,800 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Likely pathogenic (★★). Synonymous variant affecting the same amino acid position (i.e. G391G) has been classified as Benign. Variant results in nonsense mediated mRNA decay.

• Frequency:
  • Genomes: 𝑓 0.000013 (0 hom., cov: 31)
  • Exomes 𝑓: 0.0000062 (0 hom.)
• Consequence: GCDH ENST00000222214.10 frameshift
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:6
• Conservation: PhyloP100: 0.579

Genes affected

GCDH (HGNC:4189): (glutaryl-CoA dehydrogenase) The protein encoded by this gene belongs to the acyl-CoA dehydrogenase family. It catalyzes the oxidative decarboxylation of glutaryl-CoA to crotonyl-CoA and CO(2) in the degradative pathway of L-lysine, L-hydroxylysine, and L-tryptophan metabolism. It uses electron transfer flavoprotein as its electron acceptor. The enzyme exists in the mitochondrial matrix as a homotetramer of 45-kD subunits. Mutations in this gene result in the metabolic disorder glutaric aciduria type 1, which is also known as glutaric acidemia type I. Alternative splicing of this gene results in multiple transcript variants. A related pseudogene has been identified on chromosome 12. [provided by RefSeq, Mar 2013]

GCDH (HGNC:):

ACMG classification

Verdict is Pathogenic. Variant got 18 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 19-12897786-TG-T is Pathogenic according to our data. Variant chr19-12897786-TG-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 370106.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr19-12897786-TG-T is described in Lovd as [Pathogenic]. Variant chr19-12897786-TG-T is described in Lovd as [Pathogenic]. Variant chr19-12897786-TG-T is described in Lovd as [Pathogenic]. Variant chr19-12897786-TG-T is described in Lovd as [Likely_pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
GCDH	NM_000159.4	c.1173delG	p.Asn392fs	frameshift_variant	11/12	ENST00000222214.10	NP_000150.1
GCDH	NM_013976.5	c.1173delG	p.Asn392fs	frameshift_variant	11/12		NP_039663.1
GCDH	NR_102316.1	n.1336delG		non_coding_transcript_exon_variant	11/12
GCDH	NR_102317.1	n.1554delG		non_coding_transcript_exon_variant	10/11

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
GCDH	ENST00000222214.10	c.1173delG	p.Asn392fs	frameshift_variant	11/12	1	NM_000159.4	ENSP00000222214.4

Frequencies

GnomAD3 genomes AF: 0.0000132 AC: 2 AN: 151518 Hom.: 0 Cov.: 31

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.000194

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000147

Gnomad OTH AF: 0.00

GnomAD3 exomes AF: 0.00000796 AC: 2 AN: 251350 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 135876

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000578

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: 0.00000616 AC: 9 AN: 1461282 Hom.: 0 Cov.: 32 AF XY: 0.00000688 AC XY: 5 AN XY: 727008

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.0000447

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: 0.00000630

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome AF: 0.0000132 AC: 2 AN: 151518 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 73962

Gnomad4 AFR AF: 0.00

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.000194

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000147

Gnomad4 OTH AF: 0.00

Bravo AF: 0.00000378

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:6

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Glutaric aciduria, type 1 Pathogenic:5

Pathogenic, criteria provided, single submitter	clinical testing	Baylor Genetics	Dec 22, 2022	- -
Pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Oct 28, 2023	This sequence change creates a premature translational stop signal (p.Asn392Metfs*9) in the GCDH gene. While this is not anticipated to result in nonsense mediated decay, it is expected to disrupt the last 47 amino acid(s) of the GCDH protein. This variant is present in population databases (rs755038561, gnomAD 0.006%). This premature translational stop signal has been observed in individuals with glutaric acidemia type I (PMID: 8900228, 10960496, 25762492). This variant is also known as 1209delG. ClinVar contains an entry for this variant (Variation ID: 370106). This variant disrupts a region of the GCDH protein in which other variant(s) (p.Met405Asnfs*14) have been determined to be pathogenic (Invitae). This suggests that this is a clinically significant region of the protein, and that variants that disrupt it are likely to be disease-causing. For these reasons, this variant has been classified as Pathogenic. -
Likely pathogenic, criteria provided, single submitter	clinical testing	Counsyl	Nov 19, 2015	- -
Likely pathogenic, no assertion criteria provided	research	National Institute of Mental Health and Neurosciences	Jun 02, 2016	- -
Pathogenic, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	Feb 01, 2021	Variant summary: GCDH c.1173delG (p.Asn392MetfsX9) results in a premature termination codon, predicted to cause a truncation of the encoded protein or absence of the protein due to nonsense mediated decay, which are commonly known mechanisms for disease. Truncations downstream of this position have been classified as pathogenic by our laboratory. The variant allele was found at a frequency of 8e-06 in 251350 control chromosomes. c.1173delG has been reported in the literature in individuals affected with Glutaric Acidemia Type 1 (e.g. Anikster_1996, Busquets_2000, Gupta_2015). At least one publication reports experimental evidence evaluating an impact on protein function. The most pronounced variant effect results in <10% of normal activity (Busquets_2000). Four clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014 without evidence for independent evaluation. All laboratories classified the variant as pathogenic/likely pathogenic. Based on the evidence outlined above, the variant was classified as pathogenic. -

not provided Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

GeneDx

Dec 12, 2021

Not observed at significant frequency in large population cohorts (gnomAD); Frameshift variant predicted to result in protein truncation, as the last 47 amino acids are replaced with 8 different amino acids, and other loss-of-function variants have been reported downstream in the Human Gene Mutation Database (HGMD); This variant is associated with the following publications: (PMID: 8900228, 25762492, 25450519, 33064266, 34504725, 10960496) -

Computational scores

Source: dbNSFP v4.3

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		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: rs754002357; hg19: chr19-13008600;