Variant 4-1001672-G-A details in Genebe, Genetics Data Aggregator

Variant summary

Our verdict is Likely pathogenic. Variant got 9 ACMG points: 10P and 1B. PM2PP5_Very_StrongBP4

The NM_000203.5(IDUA):c.590-7G>A variant causes a splice region, splice polypyrimidine tract, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000312 in 1,601,952 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 2/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Pathogenic (★★).

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 34)

Exomes 𝑓: 0.000034 ( 0 hom. )

Consequence

IDUA
NM_000203.5 splice_region, splice_polypyrimidine_tract, intron

Scores

Splicing: ADA: 0.6696

Clinical Significance

Pathogenic criteria provided, multiple submitters, no conflicts P:6O:1

Conservation

PhyloP100: -4.52

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:

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ACMG classification

Classification made for transcript

Verdict is Likely_pathogenic. Variant got 9 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP5

Variant 4-1001672-G-A is Pathogenic according to our data. Variant chr4-1001672-G-A is described in ClinVar as [Pathogenic]. Clinvar id is 222996.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.86). . Strength limited to SUPPORTING due to the PP5.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
IDUA	NM_000203.5 linkuse as main transcript	c.590-7G>A		splice_region_variant, splice_polypyrimidine_tract_variant, intron_variant		ENST00000514224.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
IDUA	ENST00000514224.2 linkuse as main transcript	c.590-7G>A		splice_region_variant, splice_polypyrimidine_tract_variant, intron_variant		2	NM_000203.5	P1	P35475-1

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152152

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:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.00000427

AC:

AN:

234380

Hom.:

AF XY:

0.00000779

AC XY:

AN XY:

128322

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:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000936

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000338

AC:

AN:

1449800

Hom.:

Cov.:

AF XY:

0.0000333

AC XY:

AN XY:

721532

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:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000441

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.00000657

AC:

AN:

152152

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74324

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.0000113

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:6Other:1

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Mucopolysaccharidosis type 1

Pathogenic:3Other:1

not provided, no classification provided	literature only	GeneReviews	-	Variant causes attenuated MPS I; creates alternate splice site, but (as old splice site is not obliterated) some normal enzyme is produced. -
Likely pathogenic, no assertion criteria provided	clinical testing	Natera, Inc.	Sep 16, 2020	- -
Pathogenic, criteria provided, single submitter	clinical testing	Invitae	Dec 09, 2023	This sequence change falls in intron 5 of the IDUA gene. It does not directly change the encoded amino acid sequence of the IDUA protein. RNA analysis indicates that this variant induces altered splicing and may result in an absent or disrupted protein product. The frequency data for this variant in the population databases is considered unreliable, as metrics indicate poor data quality at this position in the gnomAD database. This variant has been observed in individuals with Scheie syndrome (PMID: 8213840, 28752568). This variant is also known as 678-7G>A. ClinVar contains an entry for this variant (Variation ID: 222996). Studies have shown that this variant results in activation of a cryptic splice acceptor and introduces a premature termination codon (PMID: 8318992). The resulting mRNA is expected to undergo nonsense-mediated decay. For these reasons, this variant has been classified as Pathogenic. -
Pathogenic, criteria provided, single submitter	curation	Broad Center for Mendelian Genomics, Broad Institute of MIT and Harvard	Jan 14, 2020	The c.590-7G>A variant in IDUA has been reported in at least 10 individuals with mucopolysaccharidosis (MPS) (PMID: 28752568, 8213840, 9748610) and has been identified in 0.001% (1/106874) of European (non-Finnish) chromosomes by the Genome Aggregation Database (gnomAD, http://gnomad.broadinstitute.org; dbSNP rs762411583). Although this variant has been seen in the general population, its frequency is low enough to be consistent with a recessive carrier frequency. This variant has also been reported in ClinVar (VariationID: 222996) as pathogenic by Counsyl, OMIM, and GeneReviews. Functional studies demonstrating that the variant activates a cryptic splice site provide some evidence that the c.590-7G>A variant may slightly impact protein function (PMID: 8213840). However, these types of assays may not accurately represent biological function. Computational prediction tools and conservation analyses do not provide strong support for or against an impact to the protein. This variant is located in the 3' splice region. Computational tools suggest a possible impact to splicing. However, this information is not predictive enough to determine pathogenicity. The phenotype of individuals compound heterozygous for this variant is high' ly specific for MPS based on their Alpha-L-iduronidase protein levels being <1% consistent with disease (PMID: 9748610, 8213840). In summary, this variant meets criteria to be classified as pathogenic for MPS in an autosomal recessive manner based on the presence of the variant in combination with reported pathogenic variants, the phenotype of patients with the variant being highly specific for MPS, and evidence of aberrant splicing. ACMG/AMP Criteria applied: PM3_very-strong, PM2, PP4, PS3_supporting (Richards 2015). -

Mucopolysaccharidosis, MPS-I-S

Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

Nov 01, 1993

- -

not provided

Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Revvity Omics, Revvity

Jun 19, 2023

- -

Hurler syndrome

Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Counsyl

Aug 30, 2017

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.86

CADD

Benign

6.3

DANN

Benign

0.65

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Benign

0.67

dbscSNV1_RF

Benign

0.68

SpliceAI score (max)

0.31

Details are displayed if max score is > 0.2

DS_AG_spliceai

0.24

Position offset: 2

DS_AL_spliceai

0.31

Position offset: 7

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