Case#: Patient 13 (group 2), Poland, male 2 years old (age at diagnosis), 2.5 years old (age at baseline), 6.5 years old (current age)

DiseaseAssertion: MPS1-S

FamilyInfo: N/A

CasePresentingHPOs: Limitation of join mobility, joint stiffness (HP:0001376, HP:0001387)

CaseHPOFreeText: Patients in group 2 had normal mental development or only slightly delayed mental development and, therefore, could undergo active physical rehabilitation.

CaseNotHPOs: N/A

CaseNotHPOFreeText: N/A

CaseEnzymeAssay: Diagnosis of MPS I was confirmed by the biochemical determination of α-L-iduronidase activity deficiency in leukocytes and by molecular analysis.

CaseUrineGAGs: N/A

CaseERT: Yes, weekly infusions for 52-208 weeks (depending on the patient)

CaseBMT: N/A

Variant1: c.208C>T (p.Q70X)

Variant1ClinVarID: 11909

Variant1CAID: CA204563

Variant2: c.227A>G (p.Y76C)

Variant2ClinVarID: 552686

Variant2CAID: CA2801140

AdditionalVariants: Yes - c.1345C>A (p.H449N), ClinVarID:350230, CAID:CA2802233

ParentalGenotype: N/A

PreviouslyPublished N/A

Case#: Functional assay variant with a clinical significance of having conflicting interpretations.

DiseaseAssertion: MPS-I

FamilyInfo: N/A

CasePresentingHPOs: N/A

CaseHPOFreeText: N/A

CaseNotHPOs: N/A

CaseNotHPOFreeText: N/A

CaseEnzymeAssay: N/A

CaseUrineGAGs: N/A

CaseERT: N/A

CaseBMT: N/A

Variant1: c.1345C>A (p.H449N)

Variant1ClinVarID: 350230

Variant1CAID: CA2802233

Variant2: N/A

Variant2ClinVarID: N/A

Variant2CAID: N/A

AdditionalVariants: N/A

ParentalGenotype: N/A

PreviouslyPublished N/A

Case#: Variant not associated with a proband. Variant listed in supplementary materials in Supplementary Table 4

DiseaseAssertion: Mucopolysaccharidosis type I, MPS I

FamilyInfo: N/A

CasePresentingHPOs:

CaseHPOFreeText:

CaseNotHPOs:

CaseNotHPOFreeText:

CaseEnzymeAssay: N/A

CaseUrineGAGs: N/A

CaseERT: N/A

CaseBMT: N/A

Variant1: H449N

Variant1ClinVarID: 350230

Variant1CAID: CA2802233

Variant2: N/A

Variant2ClinVarID: N/A

Variant2CAID: N/A

AdditionalVariants: N/A

ParentalGenotype: N/A

PreviouslyPublished: N/A

Case#: Patient 11 in Group 2 (patients who were at least 3 years of age at the time of introduction of ERT), 2 years old (age of diagnosis), 3 years old (baseline age), 6 years old (current age), male, Polish

DiseaseAssertion: MPS1-S

FamilyInfo: N/A

CasePresentingHPOs: N/A

CaseHPOFreeText: Anthropometric features

CaseNotHPOs: N/A

CaseNotHPOFreeText: N/A

CaseEnzymeAssay: Diagnosis of MPS I confirmed by the biochemical determination of α-l-iduronidase deficiency in leukocytes

CaseUrineGAGs: Baseline urinary GAG values ranged from 450 to 1330 mg/g of creatinine. For treated patients the reductions of urinary GAG ranged from 30% to 80% with a mean reduction of 55%, but it never approached the normal range for age.

CaseERT: Yes - for 156 weeks he received weekly intravenous infusions of 100 U/kg (0.58 mg/kg) laronidase

CaseBMT: No

Variant1: c.208C>T (p.Q70X)

Variant1ClinVarID: 11909

Variant1CAID: CA204563

Variant2: c.227A>G (p.Y76C)

Variant2ClinVarID: 552686

Variant2CAID: CA2801140

AdditionalVariants: c.1345C>A (p.H449N); ClinVarID:350230, CAID:CA2802233

ParentalGenotype: N/A

PreviouslyPublished N/A