NM_000203.5(IDUA):c.493+6C>T AND Mucopolysaccharidosis type 1

Germline classification:: Uncertain significance (2 submissions)
Last evaluated:: Oct 7, 2022
Review status:: 2 stars out of maximum of 4 stars
criteria provided, multiple submitters, no conflicts

Somatic classification of clinical impact:: None
Review status:: (0/4) 0 stars out of maximum of 4 stars
no assertion criteria provided

Somatic classification of oncogenicity:: None
Review status:: (0/4) 0 stars out of maximum of 4 stars
no assertion criteria provided

Record status:: current
Accession:: RCV001153896.6

Allele description [Variation Report for NM_000203.5(IDUA):c.493+6C>T]

NM_000203.5(IDUA):c.493+6C>T

Gene:

IDUA:alpha-L-iduronidase [Gene - OMIM - HGNC]

Variant type:

single nucleotide variant

Cytogenetic location:

4p16.3

Genomic location:

Preferred name:

NM_000203.5(IDUA):c.493+6C>T

HGVS:

NC_000004.12:g.1000995C>T
NG_008103.1:g.18999C>T
NM_000203.5:c.493+6C>TMANE SELECT
NM_001363576.1:c.97+6C>T
LRG_1277t1:c.493+6C>T
LRG_1277:g.18999C>T
NC_000004.11:g.994783C>T
NC_000004.11:g.994783C>T
NM_000203.3:c.493+6C>T

Links:

dbSNP: rs376738689

NCBI 1000 Genomes Browser:

rs376738689

Molecular consequence:

NM_000203.5:c.493+6C>T - intron variant - [Sequence Ontology: SO:0001627]
NM_001363576.1:c.97+6C>T - intron variant - [Sequence Ontology: SO:0001627]

Condition(s)

Name:: Mucopolysaccharidosis type 1
Synonyms:: Mucopolysaccharidosis type I; MPS 1; Attenuated MPS I (subtype); See all synonyms [MedGen]
Identifiers:: MONDO: MONDO:0001586; MedGen: C0023786

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Submission Accession	Submitter	Review Status (Assertion method)	Clinical Significance (Last evaluated)	Origin	Method	Citations
SCV001315206	Illumina Laboratory Services, Illumina	criteria provided, single submitter (ICSL Variant Classification Criteria 13 December 2019)	Uncertain significance (Jan 12, 2018)	germline	clinical testing	Citation Link,
SCV003520770	Labcorp Genetics (formerly Invitae), Labcorp	criteria provided, single submitter (Invitae Variant Classification Sherloc (09022015))	Uncertain significance (Oct 7, 2022)	germline	clinical testing	PubMed (3) [See all records that cite these PMIDs] 17576681, 9536098, 28492532

Submission Accession

Submitter

Review Status
(Assertion method)

Clinical Significance
(Last evaluated)

Origin

Method

Citations

SCV001315206

Illumina Laboratory Services, Illumina

criteria provided, single submitter

(ICSL Variant Classification Criteria 13 December 2019)

Uncertain significance
(Jan 12, 2018)

germline

clinical testing

Citation Link,

SCV003520770

Labcorp Genetics (formerly Invitae), Labcorp

criteria provided, single submitter

(Invitae Variant Classification Sherloc (09022015))

Uncertain significance
(Oct 7, 2022)

germline

clinical testing

PubMed (3)
[See all records that cite these PMIDs]

Help

Summary from all submissions

Ethnicity	Origin	Affected	Individuals	Families	Chromosomes tested	Number Tested	Family history	Method
not provided	germline	unknown	not provided	not provided	not provided	not provided	not provided	clinical testing

Citations

PubMed

Aberrant 5' splice sites in human disease genes: mutation pattern, nucleotide structure and comparison of computational tools that predict their utilization.

Buratti E, Chivers M, Královicová J, Romano M, Baralle M, Krainer AR, Vorechovsky I.

Nucleic Acids Res. 2007;35(13):4250-63. Epub 2007 Jun 18.

PubMed [citation]

PMID:: 17576681
PMCID:: PMC1934990

Statistical features of human exons and their flanking regions.

Zhang MQ.

Hum Mol Genet. 1998 May;7(5):919-32.

PubMed [citation]

PMID:: 9536098

See all PubMed Citations (3)

Details of each submission

From Illumina Laboratory Services, Illumina, SCV001315206.1

#	Ethnicity	Individuals	Chromosomes Tested	Family History	Method	Citations
1	not provided	not provided	not provided	not provided	clinical testing	not provided

Description

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease.

#	Sample				Method		Observation
#	Origin	Affected	Number tested	Tissue	Purpose	Method	Individuals	Allele frequency	Families	Co-occurrences
1	germline	unknown	not provided	not provided	not provided		not provided	not provided	not provided	not provided

From Labcorp Genetics (formerly Invitae), Labcorp, SCV003520770.1

#	Ethnicity	Individuals	Chromosomes Tested	Family History	Method	Citations
1	not provided	not provided	not provided	not provided	clinical testing	PubMed (3)

Description

This sequence change falls in intron 4 of the IDUA gene. It does not directly change the encoded amino acid sequence of the IDUA protein. It affects a nucleotide within the consensus splice site. This variant is present in population databases (rs376738689, gnomAD 0.006%). This variant has not been reported in the literature in individuals affected with IDUA-related conditions. ClinVar contains an entry for this variant (Variation ID: 905399). Variants that disrupt the consensus splice site are a relatively common cause of aberrant splicing (PMID: 17576681, 9536098). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may create or strengthen a splice site. 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.

#	Sample				Method		Observation
#	Origin	Affected	Number tested	Tissue	Purpose	Method	Individuals	Allele frequency	Families	Co-occurrences
1	germline	unknown	not provided	not provided	not provided		not provided	not provided	not provided	not provided

Last Updated: Sep 29, 2024

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