19-12891311-C-CT

Variant names:

• chr19-12891311-C-CT
• rs2145938175
• NM_000159.4:c.8dupT

Variant summary

Our verdict is Pathogenic. The variant received 12 ACMG points: 12P and 0B. PVS1 PM2 PP5_Moderate

The NM_000159.4(GCDH):​c.8dupT​(p.Arg4GlufsTer39) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (★). Synonymous variant affecting the same amino acid position (i.e. L3L) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 33)
• Consequence: GCDH NM_000159.4 frameshift
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 0.453
• Publications: 0 publications found

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 Gene-Disease associations (from GenCC):

• glutaryl-CoA dehydrogenase deficiency

  Inheritance: AR Classification: DEFINITIVE, STRONG, MODERATE, SUPPORTIVE Submitted by: ClinGen, Labcorp Genetics (formerly Invitae), Genomics England PanelApp, Orphanet, G2P, Myriad Women’s Health

ACMG classification

Our verdict: Pathogenic. The variant received 12 ACMG points.

• PVS1: Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant located near the start codon (<100nt), not predicted to undergo nonsense mediated mRNA decay. There are 310 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 19-12891311-C-CT is Pathogenic according to our data. Variant chr19-12891311-C-CT is described in ClinVar as [Pathogenic]. Clinvar id is 1070084.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
GCDH	NM_000159.4	c.8dupT	p.Arg4GlufsTer39	frameshift_variant	Exon 2 of 12	ENST00000222214.10	NP_000150.1
GCDH	NM_013976.5	c.8dupT	p.Arg4GlufsTer39	frameshift_variant	Exon 2 of 12		NP_039663.1
GCDH	NR_102316.1	n.116dupT		non_coding_transcript_exon_variant	Exon 2 of 12
GCDH	NR_102317.1	n.116dupT		non_coding_transcript_exon_variant	Exon 2 of 11

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
GCDH	ENST00000222214.10	c.8dupT	p.Arg4GlufsTer39	frameshift_variant	Exon 2 of 12	1	NM_000159.4	ENSP00000222214.4

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 34

GnomAD4 genome Cov.: 33

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Glutaric aciduria, type 1 Pathogenic:1

Apr 12, 2020

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

For these reasons, this variant has been classified as Pathogenic. Loss-of-function variants in GCDH are known to be pathogenic (PMID: 10699052, 11854167, 16602100). This variant has not been reported in the literature in individuals with GCDH-related conditions. This variant is not present in population databases (ExAC no frequency). This sequence change creates a premature translational stop signal (p.Arg4Glufs*39) in the GCDH gene. It is expected to result in an absent or disrupted protein product. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
PhyloP100		0.45

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

Other links and lift over

dbSNP: rs2145938175; hg19: chr19-13002125;