rs1555749927

Variant names:

• chr19-12893585-C-A
• rs1555749927
• NM_000159.4:c.437C>A

Variant summary

Our verdict is Likely pathogenic. Variant got 9 ACMG points: 9P and 0B. PM1 PM2 PP3_Strong PP5

The NM_000159.4(GCDH):​c.437C>A​(p.Ser146Tyr) 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 Conflicting classifications of pathogenicity (no stars).

• Frequency: Genomes: not found (cov: 31)
• Consequence: GCDH NM_000159.4 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:1 U:1
• Conservation: PhyloP100: 7.41

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 9 ACMG points.

• PM1: In a helix (size 11) in uniprot entity GCDH_HUMAN there are 11 pathogenic changes around while only 0 benign (100%) in NM_000159.4
• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.953
• PP5: Variant 19-12893585-C-A is Pathogenic according to our data. Variant chr19-12893585-C-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 555251.We mark this variant Likely_pathogenic, oryginal submissions are: {Likely_pathogenic=1, Uncertain_significance=1}. Variant chr19-12893585-C-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
GCDH	NM_000159.4	c.437C>A	p.Ser146Tyr	missense_variant	Exon 6 of 12	ENST00000222214.10	NP_000150.1
GCDH	NM_013976.5	c.437C>A	p.Ser146Tyr	missense_variant	Exon 6 of 12		NP_039663.1
GCDH	NR_102316.1	n.600C>A		non_coding_transcript_exon_variant	Exon 6 of 12
GCDH	NR_102317.1	n.853C>A		non_coding_transcript_exon_variant	Exon 5 of 11

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
GCDH	ENST00000222214.10	c.437C>A	p.Ser146Tyr	missense_variant	Exon 6 of 12	1	NM_000159.4	ENSP00000222214.4

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 31

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:1 Uncertain:1

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Glutaric aciduria, type 1 Pathogenic:1 Uncertain:1

Sep 25, 2021

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

In summary, the currently available evidence indicates that the variant is pathogenic, but additional data are needed to prove that conclusively. Therefore, this variant has been classified as Likely Pathogenic. Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt GCDH protein function. ClinVar contains an entry for this variant (Variation ID: 555251). This missense change has been observed in individual(s) with glutaric acidemia type I (PMID: 22728054; Invitae). This variant is not present in population databases (ExAC no frequency). This sequence change replaces serine with tyrosine at codon 146 of the GCDH protein (p.Ser146Tyr). The serine residue is highly conserved and there is a large physicochemical difference between serine and tyrosine. -

Nov 26, 2017

Counsyl

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.83
BayesDel_addAF	Pathogenic	0.58	D
BayesDel_noAF	Pathogenic	0.60
CADD	Pathogenic	27
DANN	Uncertain	0.99
DEOGEN2	Pathogenic	0.99	D;.;D;D
Eigen	Pathogenic	1.0
Eigen_PC	Pathogenic	0.92
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Pathogenic	0.98	.;D;D;D
M_CAP	Pathogenic	0.79	D
MetaRNN	Pathogenic	0.95	D;D;D;D
MetaSVM	Pathogenic	0.95	D
MutationAssessor	Pathogenic	4.4	H;.;H;.
PrimateAI	Uncertain	0.75	T
PROVEAN	Pathogenic	-5.9	D;.;.;.
REVEL	Pathogenic	0.92
Sift	Pathogenic	0.0	D;.;.;.
Sift4G	Pathogenic	0.0	D;D;D;D
Polyphen		1.0	D;.;D;.
Vest4		0.93
MutPred		0.76		Loss of disorder (P = 0.017);.;Loss of disorder (P = 0.017);.;
MVP		1.0
MPC		1.3
ClinPred		1.0	D
GERP RS		5.4
Varity_R		0.97
gMVP		0.94

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: rs1555749927; hg19: chr19-13004399;