NM_018297.4:c.1169G>C

Variant names:

• chr3-25733963-C-G
• rs1135401728
• NM_018297.4:c.1169G>C

Variant summary

Our verdict is Likely pathogenic. The variant received 6 ACMG points: 6P and 0B. PM2 PM5 PP3_Moderate

The NM_018297.4(NGLY1):​c.1169G>C​(p.Arg390Pro) 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. R390L) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 30)
• Consequence: NGLY1 NM_018297.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter P:1 U:1
• Conservation: PhyloP100: 7.50
• Publications: 11 publications found

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]

NGLY1 Gene-Disease associations (from GenCC):

• congenital disorder of deglycosylation 1

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: ClinGen, Labcorp Genetics (formerly Invitae), G2P
• NGLY1-deficiency

  Inheritance: AR Classification: STRONG, SUPPORTIVE Submitted by: Orphanet, PanelApp Australia

ACMG classification

Our verdict: Likely_pathogenic. The variant received 6 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr3-25733963-C-T is described in ClinVar as Likely_pathogenic. ClinVar VariationId is 827607.Status of the report is criteria_provided_single_submitter, 1 stars.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.931

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
NGLY1	NM_018297.4	c.1169G>C	p.Arg390Pro	missense_variant	Exon 8 of 12	ENST00000280700.10	NP_060767.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
NGLY1	ENST00000280700.10	c.1169G>C	p.Arg390Pro	missense_variant	Exon 8 of 12	1	NM_018297.4	ENSP00000280700.5

Frequencies

GnomAD3 genomes Cov.: 30

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 30

ClinVar

Significance: Uncertain significance

Submissions summary: Pathogenic:1 Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Congenital disorder of deglycosylation Pathogenic:1

Jan 07, 2016

Medical Biochemical Genetics, National Human Genome institute, NIH, National Institutes of Health

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

not provided Uncertain:1

Oct 25, 2023

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Has been reported in the compound heterozygous state with another NGLY1 variant in a patient with clinical features suggestive of NGLY1-related congenital disorder of deglycosylation (PMID: 27388694); Studies in from tissues derived from pluripotent stem cells from a patient harboring this variant demonstrate a likely protein expression effect in this cell line; however additional studies are needed to validate the functional effect of this variant specifically (PMID: 36875753); Not observed at significant frequency in large population cohorts (gnomAD); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; This variant is associated with the following publications: (PMID: 25900930, 36589922, 34051448, 35406718, 32071843, 32422350, 33497766, 27388694, 36875753) -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.31	D
BayesDel_noAF	Pathogenic	0.21
CADD	Pathogenic	29
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.80	.;D;.;D;.
Eigen	Pathogenic	0.93
Eigen_PC	Pathogenic	0.83
FATHMM_MKL	Pathogenic	1.0	D
LIST_S2	Uncertain	0.96	D;D;D;D;D
M_CAP	Uncertain	0.12	D
MetaRNN	Pathogenic	0.93	D;D;D;D;D
MetaSVM	Uncertain	0.0033	D
MutationAssessor	Pathogenic	4.1	.;H;H;.;.
PhyloP100		7.5
PrimateAI	Uncertain	0.62	T
PROVEAN	Pathogenic	-6.6	D;D;D;D;D
REVEL	Pathogenic	0.70
Sift	Pathogenic	0.0	D;D;D;D;D
Sift4G	Pathogenic	0.0	D;D;D;D;D
Polyphen		1.0	D;D;D;.;.
Vest4		0.85
MutPred		0.79		.;Loss of MoRF binding (P = 0.0331);Loss of MoRF binding (P = 0.0331);.;.;
MVP		0.83
MPC		0.31
ClinPred		1.0	D
GERP RS		4.9
Varity_R		0.97
gMVP		0.96
Mutation Taster		=5/95	disease causing (ClinVar)

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: rs1135401728; hg19: chr3-25775454;