NM_000202.8:c.1425G>A

Variant names:

• chrX-149482974-C-T
• rs199422230
• NM_000202.8:c.1425G>A

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_000202.8(IDS):​c.1425G>A​(p.Trp475*) variant causes a stop gained change. 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 Likely pathogenic (★★).

• Frequency: Genomes: not found (cov: 23)
• Consequence: IDS NM_000202.8 stop_gained
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:4
• Conservation: PhyloP100: 4.07

Genes affected

IDS (HGNC:5389): (iduronate 2-sulfatase) This gene encodes a member of the sulfatase family of proteins. The encoded preproprotein is proteolytically processed to generate two polypeptide chains. This enzyme is involved in the lysosomal degradation of heparan sulfate and dermatan sulfate. Mutations in this gene are associated with the X-linked lysosomal storage disease mucopolysaccharidosis type II, also known as Hunter syndrome. Alternative splicing results in multiple transcript variants, at least one of which encodes a preproprotein that is proteolytically processed. [provided by RefSeq, Jan 2016]

ENSG00000241489 (HGNC:):

ACMG classification

Verdict is Pathogenic. Variant got 18 ACMG points.

• PVS1: Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant is located in the 3'-most exon, not predicted to undergo nonsense mediated mRNA decay. There are 71 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant X-149482974-C-T is Pathogenic according to our data. Variant chrX-149482974-C-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 10495.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chrX-149482974-C-T is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
IDS	NM_000202.8	c.1425G>A	p.Trp475*	stop_gained	Exon 9 of 9	ENST00000340855.11	NP_000193.1
IDS	NM_001166550.4	c.1155G>A	p.Trp385*	stop_gained	Exon 9 of 9		NP_001160022.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
IDS	ENST00000340855.11	c.1425G>A	p.Trp475*	stop_gained	Exon 9 of 9	1	NM_000202.8	ENSP00000339801.6
ENSG00000241489	ENST00000651111.1	c.792G>A	p.Trp264*	stop_gained	Exon 14 of 14			ENSP00000498395.1
ENSG00000241489	ENST00000422081.6	c.792G>A	p.Trp264*	stop_gained	Exon 9 of 9	2		ENSP00000477056.1
ENSG00000241489	ENST00000441880.1	n.*116G>A		downstream_gene_variant		2

Frequencies

GnomAD3 genomes Cov.: 23

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 23

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:4

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Mucopolysaccharidosis, MPS-II Pathogenic:4

Jun 07, 2024

Laboratory of Diagnosis and Therapy of Lysosomal Disorders, University of Padova

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: literature only

Null variant (PVS1_Strong), Prevalence of the variant significantly increased in affected individuals compared with controls (PS4_Supporting), Absent from controls (or at low frequency) in gnomAD database (PM2_Moderate), Patient’s phenotype or family history highly specific for the disease (PP4_Moderate) -

-

Department of Medical Genetics, Sanjay Gandhi Post Graduate Institute of Medical Sciences

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Aug 01, 1992

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

- -

Oct 23, 2021

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

ClinVar contains an entry for this variant (Variation ID: 10495). This premature translational stop signal has been observed in individual(s) with Hunter syndrome (PMID: 1303211). This variant is not present in population databases (gnomAD no frequency). This sequence change creates a premature translational stop signal (p.Trp475*) in the IDS gene. While this is not anticipated to result in nonsense mediated decay, it is expected to disrupt the last 76 amino acid(s) of the IDS protein. This variant disrupts a region of the IDS protein in which other variant(s) (p.Leu530Phefs*8) have been determined to be pathogenic (PMID: 7581397, 17284421; external communication). This suggests that this is a clinically significant region of the protein, and that variants that disrupt it are likely to be disease-causing. For these reasons, this variant has been classified as Pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.74	D
BayesDel_noAF	Pathogenic	0.54
CADD	Pathogenic	36
DANN	Uncertain	0.99
FATHMM_MKL	Uncertain	0.86	D
Vest4		0.75
GERP RS		4.7

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: rs199422230; hg19: chrX-148564505;