Supplementary Table S1 & S2 Proband and Variant Information:

Case2: GT3, Female, 32, French

DiseaseAssertion: Glanzmann thrombasthenia

FamilyInfo: N/A

ParentalGenotype: N/A

CasePresentingHPOs: HP:0000421, HP:0031364, HP:0000979, HP:0002239

(Epistaxis, ecchymosis, purpura, GI bleeding,)

CaseHPOFreeText: Excessive menstrual bleeding, proband sometimes hospitalized with severe symptoms

CaseNotHPOs: N/A

CaseNotHPOsFreeText: N/A

ProteinExpression: Flow cytometry showed <5% expression of αIIbβ3 (See Supplementary Table 1)

PlateletAggregation: Absent platelet aggregation (See Supplementary Table 1)

CasePreviousTesting: Sanger sequencing of ITGA2B and ITGB3

Gene: ITGB3

Variant: NM_000212.2:c.353T>A, NM_000212.2:c.709_710del, NM_000212.2:c.1732G>A

LegacyVariant: N/A

ClinVar: N/A

CAiD: CA291224511, CA8623029 and CA8623343

gnomAD: MAF in the European non Finnish populationis 0.00001796 http://gnomad.broadinstitute.org/variant/17-45363717-CAG-C and MAF in the Other popualation is 0.0008149 http://gnomad.broadinstitute.org/variant/17-45376715-G-A

Case2: No assertion made on age, gender or ethnicity

DiseaseAssertion: Glanzmann thrombasthenia

FamilyInfo: Table 1 states family history is available.

ParentalGenotype: The identified variants were heterozygote in parents and were not present as homozygote in their healthy members of the family as expected in cases where mutations are deleterious.

CasePresentingHPOs: N/A

CaseHPOFreeText: Bleeding time is greater than 20 minutes and prolonged clotting time

CaseNotHPOs: N/A

CaseNotHPOsFreeText: N/A

ProteinExpression: N/A

CasePreviousTesting: Genetic study of patient was conducted using direct sequencing of entire coding and exon-intron boundaries of the ITGA2B and ITGB3 genes.

Gene: ITGB3

Variant: NM_000212.2:c.1658_1660del (p.Ser553del)

LegacyVariant: N/A

ClinVar: N/A

CAiD: CA626684826 (p.Ser553del)

gnomAD: MAF in Latino population: 0.0001158 https://gnomad.broadinstitute.org/variant/17-45369899-TCTC-T