X-149482789-T-C

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM1 PM2

The NM_000202.8(IDS):c.1610A>G(p.Asn537Ser) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 22)
• Consequence: IDS NM_000202.8 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 5.06

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM1: In a chain Iduronate 2-sulfatase 14 kDa chain (size 94) in uniprot entity IDS_HUMAN there are 35 pathogenic changes around while only 4 benign (90%) in NM_000202.8
• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
IDS	NM_000202.8	c.1610A>G	p.Asn537Ser	missense_variant	9/9	ENST00000340855.11
IDS	NM_001166550.4	c.1340A>G	p.Asn447Ser	missense_variant	9/9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
IDS	ENST00000340855.11	c.1610A>G	p.Asn537Ser	missense_variant	9/9	1	NM_000202.8	P1

Frequencies

GnomAD3 genomes Cov.: 22

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 22

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Mucopolysaccharidosis, MPS-II Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Jan 11, 2022

This sequence change replaces asparagine, which is neutral and polar, with serine, which is neutral and polar, at codon 537 of the IDS protein (p.Asn537Ser). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with IDS-related conditions. Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated. 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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.066
BayesDel_addAF	Uncertain	0.052	T
BayesDel_noAF	Benign	-0.16
Cadd	Benign	18
Dann	Uncertain	0.99
DEOGEN2	Benign	0.41	T;.
FATHMM_MKL	Uncertain	0.88	D
LIST_S2	Benign	0.79	T;T
M_CAP	Pathogenic	0.92	D
MetaRNN	Uncertain	0.54	D;D
MetaSVM	Pathogenic	1.5	D
MutationAssessor	Uncertain	2.2	M;.
MutationTaster	Benign	0.99	D;D;D
PrimateAI	Benign	0.38	T
PROVEAN	Benign	-1.8	N;.
REVEL	Uncertain	0.42
Sift	Benign	0.14	T;.
Sift4G	Benign	0.16	T;T
Polyphen		0.43	B;.
Vest4		0.31
MutPred		0.37		Gain of loop (P = 0.0013);.;
MVP		0.96
MPC		0.18
ClinPred		0.73	D
GERP RS		5.8
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.30
gMVP		0.36

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: rs2089303240; hg19: chrX-148564320;