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: D349Y

Variant1ClinVarID: 638075

Variant1CAID: CA355963146

Variant2: N/A

Variant2ClinVarID: N/A

Variant2CAID: N/A

AdditionalVariants: N/A

ParentalGenotype: N/A

PreviouslyPublished: N/A

Case#: Patient 18, born in 2012 (paper published in 2017), 7 months (age at first treatment)

DiseaseAssertion: MPSI-H

FamilyInfo: N/A

CasePresentingHPOs: Corneal clouding (HP:0007957)

CaseHPOFreeText: N/A

CaseNotHPOs: Retinopathy, cataract (HP:0000488, HP:0000518)

CaseNotHPOFreeText: N/A

CaseEnzymeAssay: 79.39 ng/mol (42.66 weight matched enzyme reference assay)

CaseUrineGAGs: 0.51 DS/CS

CaseERT: Yes

CaseBMT: Yes, Uncle

Variant1: c.1045G>T (p.D349Y)

Variant1ClinVarID: 638075

Variant1CAID: CA355963146

Variant2: c.1045G>T (p.D349Y)

Variant2ClinVarID: 638075

Variant2CAID: CA355963146

AdditionalVariants: N/A

ParentalGenotype: N/A

PreviouslyPublished N/A