19-12891187-C-T

Variant names:

• chr19-12891187-C-T
• rs778329051
• NM_000159.4:c.-50C>T

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_000159.4(GCDH):​c.-50C>T variant causes a 5 prime UTR premature start codon gain change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000405 in 764,864 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: 𝑓 0.000046 (0 hom., cov: 32)
  • Exomes 𝑓: 0.000039 (0 hom.)
• Consequence: GCDH NM_000159.4 5_prime_UTR_premature_start_codon_gain
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -3.84
• Publications: 1 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: Likely_benign. The variant received -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.8).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
GCDH	NM_000159.4	c.-50C>T		5_prime_UTR_premature_start_codon_gain_variant	Exon 1 of 12	ENST00000222214.10	NP_000150.1
GCDH	NM_000159.4	c.-50C>T		5_prime_UTR_variant	Exon 1 of 12	ENST00000222214.10	NP_000150.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
GCDH	ENST00000222214.10	c.-50C>T		5_prime_UTR_premature_start_codon_gain_variant	Exon 1 of 12	1	NM_000159.4	ENSP00000222214.4
GCDH	ENST00000222214.10	c.-50C>T		5_prime_UTR_variant	Exon 1 of 12	1	NM_000159.4	ENSP00000222214.4

Frequencies

GnomAD3 genomes AF: 0.0000460 AC: 7 AN: 152254 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.000103

Gnomad OTH AF: 0.00

GnomAD4 exome AF: 0.0000392 AC: 24 AN: 612610 Hom.: 0 Cov.: 8 AF XY: 0.0000308 AC XY: 10 AN XY: 324928

African (AFR) AF: 0.0000589 AC: 1 AN: 16974

American (AMR) AF: 0.00 AC: 0 AN: 34286

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 20056

East Asian (EAS) AF: 0.00 AC: 0 AN: 32086

South Asian (SAS) AF: 0.00 AC: 0 AN: 64642

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 33594

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 2562

European-Non Finnish (NFE) AF: 0.0000558 AC: 21 AN: 376306

Other (OTH) AF: 0.0000623 AC: 2 AN: 32104

GnomAD4 genome AF: 0.0000460 AC: 7 AN: 152254 Hom.: 0 Cov.: 32 AF XY: 0.0000403 AC XY: 3 AN XY: 74374

African (AFR) AF: 0.00 AC: 0 AN: 41480

American (AMR) AF: 0.00 AC: 0 AN: 15282

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3470

East Asian (EAS) AF: 0.00 AC: 0 AN: 5200

South Asian (SAS) AF: 0.00 AC: 0 AN: 4830

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10620

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 316

European-Non Finnish (NFE) AF: 0.000103 AC: 7 AN: 68050

Other (OTH) AF: 0.00 AC: 0 AN: 2094

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.0000453

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Glutaric aciduria, type 1 Uncertain:1

Jan 13, 2018

Illumina Laboratory Services, Illumina

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.80
CADD	Benign	0.38
DANN	Benign	0.86
PhyloP100		-3.8
PromoterAI		-0.19	Neutral
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.3
Mutation Taster		=300/0	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.040		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: rs778329051; hg19: chr19-13002001;