rs886043347

Variant names:

• chr4-1004329-C-A
• NM_000203.5:c.1898C>A

Your query was ambiguous. Multiple possible variants found:

• chr4-1004329-C-A
• chr4-1004329-C-G
• chr4-1004329-C-T

Variant summary

Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PVS1_Moderate PM2 PP5_Very_Strong

The NM_000203.5(IDUA):​c.1898C>A​(p.Ser633*) variant causes a stop gained change. The variant allele was found at a frequency of 0.00000206 in 1,459,632 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000021 (0 hom.)
• Consequence: IDUA NM_000203.5 stop_gained
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:4
• Conservation: PhyloP100: 4.17

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]

ACMG classification

Verdict is Pathogenic. Variant got 12 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. Fraction of 0.0326 CDS is truncated, and there are 1 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 4-1004329-C-A is Pathogenic according to our data. Variant chr4-1004329-C-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 1068474.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr4-1004329-C-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
IDUA	NM_000203.5	c.1898C>A	p.Ser633*	stop_gained	Exon 14 of 14	ENST00000514224.2	NP_000194.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
IDUA	ENST00000514224.2	c.1898C>A	p.Ser633*	stop_gained	Exon 14 of 14	2	NM_000203.5	ENSP00000425081.2
IDUA	ENST00000247933.9	c.1898C>A	p.Ser633*	stop_gained	Exon 14 of 14	1		ENSP00000247933.4
IDUA	ENST00000514698.5	n.2009C>A		non_coding_transcript_exon_variant	Exon 11 of 11	5
IDUA	ENST00000652070.1	n.1954C>A		non_coding_transcript_exon_variant	Exon 13 of 13

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000206 AC: 3 AN: 1459632 Hom.: 0 Cov.: 32 AF XY: 0.00000413 AC XY: 3 AN XY: 726210

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: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000270

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:4

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Mucopolysaccharidosis type 1 Pathogenic:3

Mar 18, 2021

Natera, Inc.

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Aug 16, 2023

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

For these reasons, this variant has been classified as Pathogenic. This variant disrupts a region of the IDUA protein in which other variant(s) (p.Ser633Leu) have been determined to be pathogenic (PMID: 11735025, 16438163, 21480867, 26825088, 27146977). This suggests that this is a clinically significant region of the protein, and that variants that disrupt it are likely to be disease-causing. This sequence change creates a premature translational stop signal (p.Ser633*) in the IDUA gene. While this is not anticipated to result in nonsense mediated decay, it is expected to disrupt the last 21 amino acid(s) of the IDUA protein. ClinVar contains an entry for this variant (Variation ID: 1068474). This premature translational stop signal has been observed in individual(s) with mucopolysaccharidosis type I (PMID: 28752568). This variant is not present in population databases (gnomAD no frequency). -

Apr 27, 2022

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

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: IDUA c.1898C>A (p.Ser633X) results in a premature termination codon, predicted to cause a truncation of the encoded protein or absence of the protein due to nonsense mediated decay, which are commonly known mechanisms for disease. Truncations downstream of this position have been classified as pathogenic by our laboratory. The variant was absent in 249054 control chromosomes. c.1898C>A has been reported in the literature in at least one individual affected with Mucopolysaccharidosis Type 1. One clinical diagnostic laboratory has submitted clinical-significance assessments for this variant to ClinVar after 2014 without evidence for independent evaluation and classified the variant as pathogenic. Based on the evidence outlined above, the variant was classified as pathogenic. -

Mucopolysaccharidosis, MPS-I-S;C0086431:Mucopolysaccharidosis, MPS-I-H/S;C0086795:Hurler syndrome Pathogenic:1

Mar 18, 2024

Fulgent Genetics, Fulgent Genetics

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.62	D
BayesDel_noAF	Pathogenic	0.65
CADD	Pathogenic	38
DANN	Uncertain	0.99
Eigen	Pathogenic	0.80
Eigen_PC	Uncertain	0.65
FATHMM_MKL	Pathogenic	0.99	D
Vest4		0.67
GERP RS		5.5

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr4-998117;