rs1553660431

Positions:

• chr3-25764127-C-T

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_018297.4(NGLY1):​c.431G>A​(p.Gly144Glu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign 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. G144R) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: NGLY1 NM_018297.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.341

Genes affected

NGLY1 (HGNC:17646): (N-glycanase 1) This gene encodes an enzyme that catalyzes hydrolysis of an N(4)-(acetyl-beta-D-glucosaminyl) asparagine residue to N-acetyl-beta-D-glucosaminylamine and a peptide containing an aspartate residue. The encoded enzyme may play a role in the proteasome-mediated degradation of misfolded glycoproteins. Multiple transcript variants encoding different isoforms have been found for this gene.[provided by RefSeq, Feb 2009]

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.0556466).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
NGLY1	NM_018297.4	c.431G>A	p.Gly144Glu	missense_variant	3/12	ENST00000280700.10

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
NGLY1	ENST00000280700.10	c.431G>A	p.Gly144Glu	missense_variant	3/12	1	NM_018297.4	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Congenital disorder of deglycosylation Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Dec 06, 2022

In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. 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 not expected to disrupt NGLY1 protein function. ClinVar contains an entry for this variant (Variation ID: 474224). This variant has not been reported in the literature in individuals affected with NGLY1-related conditions. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces glycine, which is neutral and non-polar, with glutamic acid, which is acidic and polar, at codon 144 of the NGLY1 protein (p.Gly144Glu). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.078
BayesDel_addAF	Benign	-0.20	T
BayesDel_noAF	Benign	-0.52
CADD	Benign	14
DANN	Benign	0.94
DEOGEN2	Benign	0.13	.;T;.;T;.;.
Eigen	Benign	-1.0
Eigen_PC	Benign	-1.0
FATHMM_MKL	Benign	0.034	N
LIST_S2	Benign	0.71	T;T;T;T;T;T
M_CAP	Benign	0.0053	T
MetaRNN	Benign	0.056	T;T;T;T;T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	1.8	L;L;L;.;.;.
MutationTaster	Benign	1.0	N;N;N;N;N
PrimateAI	Benign	0.31	T
PROVEAN	Benign	-0.94	N;N;N;N;N;N
REVEL	Benign	0.097
Sift	Benign	0.59	T;T;T;T;T;D
Sift4G	Benign	1.0	T;T;T;T;T;.
Polyphen		0.0040	B;B;B;.;.;.
Vest4		0.17
MutPred		0.12		Gain of glycosylation at T149 (P = 0.0472);Gain of glycosylation at T149 (P = 0.0472);Gain of glycosylation at T149 (P = 0.0472);.;.;.;
MVP		0.37
MPC		0.043
ClinPred		0.085	T
GERP RS		0.49
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.065
gMVP		0.29

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.11		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: rs1553660431; hg19: chr3-25805618;