rs546933529

Variant summary

Our verdict is Likely benign. Variant got -5 ACMG points: 0P and 5B. BP4_StrongBS1_Supporting

The NM_000203.5(IDUA):c.757G>T(p.Gly253Cys) variant causes a missense change. The variant allele was found at a frequency of 0.000267 in 1,599,278 control chromosomes in the GnomAD database, including 5 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. G253D) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.00017 ( 0 hom., cov: 33)

Exomes 𝑓: 0.00028 ( 5 hom. )

Consequence

IDUA
NM_000203.5 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:4B:2

Conservation

PhyloP100: 4.76

Variant links:

Genes affected

IDUA (HGNC:5391): (alpha-L-iduronidase) This gene encodes an enzyme that hydrolyzes the terminal alpha-L-iduronic acid residues of two glycosaminoglycans, dermatan sulfate and heparan sulfate. This hydrolysis is required for the lysosomal degradation of these glycosaminoglycans. Mutations in this gene that result in enzymatic deficiency lead to the autosomal recessive disease mucopolysaccharidosis type I (MPS I). [provided by RefSeq, Jul 2008]

IDUA links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -5 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.018639833).

BS1

Variant frequency is greater than expected in population sas. gnomad4 allele frequency = 0.000171 (26/152316) while in subpopulation SAS AF= 0.00476 (23/4832). AF 95% confidence interval is 0.00325. There are 0 homozygotes in gnomad4. There are 12 alleles in male gnomad4 subpopulation. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
IDUA	NM_000203.5 linkuse as main transcript	c.757G>T	p.Gly253Cys	missense_variant	6/14	ENST00000514224.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
IDUA	ENST00000514224.2 linkuse as main transcript	c.757G>T	p.Gly253Cys	missense_variant	6/14	2	NM_000203.5	P1	P35475-1

Frequencies

GnomAD3 genomes

AF:

0.000184

AC:

AN:

152198

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000386

Gnomad SAS

AF:

0.00517

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000600

AC:

131

AN:

218446

Hom.:

AF XY:

0.000663

AC XY:

AN XY:

119190

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00456

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000103

Gnomad OTH exome

AF:

0.000184

GnomAD4 exome

AF:

0.000277

AC:

401

AN:

1446962

Hom.:

Cov.:

AF XY:

0.000359

AC XY:

258

AN XY:

718912

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00439

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000181

Gnomad4 OTH exome

AF:

0.000435

GnomAD4 genome

AF:

0.000171

AC:

AN:

152316

Hom.:

Cov.:

AF XY:

0.000161

AC XY:

AN XY:

74466

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.000386

Gnomad4 SAS

AF:

0.00476

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000193

Hom.:

Bravo

AF:

0.0000302

ExAC

AF:

0.000492

AC:

Asia WGS

AF:

0.00375

AC:

AN:

3478

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:4Benign:2

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Mucopolysaccharidosis type 1

Benign:2

Likely benign, no assertion criteria provided	clinical testing	Natera, Inc.	Jun 08, 2020	- -
Likely benign, criteria provided, single submitter	clinical testing	Invitae	Jan 28, 2024	- -

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Apr 15, 2021

Variant summary: IDUA c.757G>T (p.Gly253Cys) results in a non-conservative amino acid change in the encoded protein sequence. Five of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 0.0006 in 218446 control chromosomes, predominantly at a frequency of 0.0046 within the South Asian subpopulation in the gnomAD database. The observed variant frequency within South Asian control individuals in the gnomAD database is approximately 1.7 fold of the estimated maximal expected allele frequency for a pathogenic variant in IDUA causing Mucopolysaccharidosis Type 1 phenotype (0.0027), strongly suggesting that the variant is a benign polymorphism found primarily in populations of South Asian origin. c.757G>T has been reported in the literature in at least an individual (in homozygous state) affected with Mucopolysaccharidosis Type 1 - subtype Hurler-Scheie (Uttarilli_2016). No enzymatic activity was found from patient derived leucocytes who was homozygous for this variant of interest (Uttarilli_2016). Four ClinVar submitters (evaluation after 2014) cite the variant as uncertain significance (n=2) or likely benign (n=2). Based on the evidence outlined above, the variant was classified as uncertain significance. -

Inborn genetic diseases

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Dec 13, 2017

- -

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Revvity Omics, Revvity

Apr 27, 2023

- -

Hurler syndrome

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Counsyl

Sep 29, 2017

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.34

BayesDel_addAF

Benign

-0.0040

BayesDel_noAF

Pathogenic

0.22

Cadd

Uncertain

Dann

Uncertain

1.0

DEOGEN2

Pathogenic

0.97

D;.;D;.

Eigen

Uncertain

0.39

Eigen_PC

Uncertain

0.25

FATHMM_MKL

Uncertain

0.90

LIST_S2

Uncertain

0.91

D;D;.;.

MetaRNN

Benign

0.019

T;T;T;T

MetaSVM

Pathogenic

1.1

MutationAssessor

Uncertain

2.5

M;.;.;.

MutationTaster

Benign

0.86

D;D;D

PrimateAI

Uncertain

0.62

PROVEAN

Pathogenic

-6.2

D;D;D;D

REVEL

Pathogenic

0.81

Sift

Uncertain

0.0040

D;D;D;D

Sift4G

Uncertain

0.0060

D;D;D;D

Polyphen

1.0

D;.;.;.

Vest4

0.67

MutPred

0.74

.;Gain of glycosylation at Y211 (P = 0.0105);.;.;

MVP

0.99

MPC

0.75

ClinPred

0.17

GERP RS

3.5

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.88

gMVP

0.93

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over