rs748185335

chr19-12891930-A-Cchr19-12891930-A-G

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM1 PM2 PP3_Moderate

The NM_000159.4(GCDH):c.227A>C(p.Gln76Pro) variant causes a missense 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. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. Q76R) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: GCDH NM_000159.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 8.76

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]

ACMG classification

Verdict is Likely_pathogenic. Variant got 6 ACMG points.

• PM1: In a hotspot region, there are 3 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 1 benign, 8 uncertain in NM_000159.4
• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.913

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
GCDH	NM_000159.4	c.227A>C	p.Gln76Pro	missense_variant	4/12	ENST00000222214.10
GCDH	NM_013976.5	c.227A>C	p.Gln76Pro	missense_variant	4/12
GCDH	NR_102316.1	n.335A>C		non_coding_transcript_exon_variant	4/12
GCDH	NR_102317.1	n.643A>C		non_coding_transcript_exon_variant	3/11

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
GCDH	ENST00000222214.10	c.227A>C	p.Gln76Pro	missense_variant	4/12	1	NM_000159.4	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Glutaric aciduria, type 1 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Counsyl

Jul 25, 2017

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.72
BayesDel_addAF	Pathogenic	0.47	D
BayesDel_noAF	Pathogenic	0.43
Cadd	Pathogenic	28
Dann	Uncertain	0.99
DEOGEN2	Pathogenic	0.99	D;.;D;D;D
Eigen	Pathogenic	0.85
Eigen_PC	Pathogenic	0.78
FATHMM_MKL	Uncertain	0.94	D
M_CAP	Pathogenic	0.87	D
MetaRNN	Pathogenic	0.91	D;D;D;D;D
MetaSVM	Pathogenic	0.92	D
MutationAssessor	Pathogenic	4.5	H;.;H;.;.
MutationTaster	Benign	1.0	D;D;D;D
PrimateAI	Uncertain	0.50	T
PROVEAN	Pathogenic	-5.4	D;.;.;.;.
REVEL	Pathogenic	0.94
Sift	Uncertain	0.0010	D;.;.;.;.
Sift4G	Uncertain	0.0070	D;D;D;D;D
Polyphen		0.72	P;.;P;.;.
Vest4		0.83
MutPred		0.60		Gain of phosphorylation at T73 (P = 0.1168);Gain of phosphorylation at T73 (P = 0.1168);Gain of phosphorylation at T73 (P = 0.1168);.;Gain of phosphorylation at T73 (P = 0.1168);
MVP		0.98
MPC		1.2
ClinPred		1.0	D
GERP RS		5.2
Varity_R		0.99
gMVP		0.92

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

Other links and lift over

dbSNP: rs748185335; hg19: chr19-13002744;