ClinVar Miner

Submissions for variant NM_000203.5(IDUA):c.1163C>A (p.Thr388Lys) (rs794727896)

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Total submissions: 3
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Submitter RCV SCV Clinical significance Condition Last evaluated Review status Method Comment
EGL Genetic Diagnostics, Eurofins Clinical Diagnostics RCV000723454 SCV000700424 likely pathogenic not provided 2016-12-22 criteria provided, single submitter clinical testing
Counsyl RCV000597524 SCV000796074 uncertain significance Hurler syndrome 2017-12-07 criteria provided, single submitter clinical testing
Broad Institute Rare Disease Group, Broad Institute RCV001249042 SCV001422980 likely pathogenic Mucopolysaccharidosis type 1 2020-01-13 no assertion criteria provided curation The p.Thr388Lys variant in IDUA has been reported in 1 individual with mucopolysaccharidosis (MPS) (PMID: 27520059) and has been identified in 0.009% (1/10974) of East Asian chromosomes by the Genome Aggregation Database (gnomAD,; dbSNP rs794727896). 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: 198686) as a VUS by Counsyl and as likely pathogenic by EGL Genetic Diagnostics. Computational prediction tools and conservation analyses suggest that this variant may impact the protein, though this information is not predictive enough to determine pathogenicity. One additional pathogenic variant, resulting in a different amino acid change at the same position, p.Thr388Arg, has been reported in association with disease in the literature and ClinVar, supporting that a change at this position may not be tolerated (PMID: 28752568, 21963080, 28728811; Variation ID: 496834). The presence of this variant in 1 affected homozygote with MPS increases the likelihood that the p.Thr388Lys variant is pathogenic (PMID: 27520059). In summary, although additional studies are required to fully establish its clinical significance, this variant is likely pathogenic. ACMG/AMP Criteria applied: PM2, PM5, PP3, PM3_supporting (Richards 2015).

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