Evidence Repository - Clinical Genome Resources

The ClinGen Evidence Repository is an FDA-recognized human genetic variant database containing expert-curated assertions regarding variants' pathogenicity and supporting evidence summaries. [Disclaimer]

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Variant: NM_000212.3(ITGB3):c.727G>C (p.Asp243His)

CA400023600

800945 (ClinVar)

Gene: ITGB3

Condition: Glanzmann's thrombasthenia

Inheritance Mode: Autosomal recessive inheritance

Link to MONDO

UUID: 712094bd-7187-4f2b-bc0f-90c0275d5d2f

HGVS expressions

NM_000212.3:c.727G>C

NM_000212.3(ITGB3):c.727G>C (p.Asp243His)

ENST00000559488.7:c.727G>C

ENST00000559488.5:c.727G>C

ENST00000560629.1:n.692G>C

ENST00000571680.1:c.727G>C

NM_000212.2:c.727G>C

NC_000017.11:g.47286372G>C

CM000679.2:g.47286372G>C

NC_000017.10:g.45363738G>C

CM000679.1:g.45363738G>C

NC_000017.9:g.42718737G>C

NG_008332.2:g.37531G>C

Likely Pathogenic

PM3 PP1_Moderate PM2_Supporting PP3

PM5 PP4

Evidence Links 0

Expert Panel

Platelet Disorders VCEP

Criteria Specification Information

Criteria Specifications for this VCEP

Evidence submitted by expert panel

Platelet Disorders VCEP

The ITGB3 missense variant NM_000212.3:c.727G>C replaces the aspartic acid residue with a histidine residue (p.Asp243His) and is absent from control population databases. This variant has been observed in homozygosity in three probands suspected to have Glanzmann's thrombasthenia (GT) (GT-11 and GT-15 in PMID: 30792900; Case 19 in PMID: 32680510), as well as two affected family members of GT-15. However sufficient information to confirm if the individuals' phenotypes (or the phenotype of any affected family member) were specific for GT was not provided. In silico tools predict the variant is damaging to protein function. In summary, this variant meets criteria to be classified as likely pathogenic for GT. GT-specific criteria applied: PP1_moderate, PM3, PP3, PM2_supporting.

PM3

This variant has been observed in homozygosity in three probands (GT-11 and GT-15 in PMID: 30792900 and Case 19 in PMID: 32680510). Each occurrence earns 0.5 points, however homozygous occurrences are capped at a maximum of 1 point, which is sufficient to apply PM3.

PP1_Moderate

This variant was observed in homozygosity in a proband (GT-15 in PMID: 30792900) and two affected family members (also in homozygosity; FAM-03 GT-16 and GT-17 in PMID: 30792900).

PM2_Supporting

This variant is absent from all population cohorts in gnomAD, ExAC, 1000 Genomes, and ESP.

PP3

REVEL score of 0.983 is above the >.0.7 threshold to support a deleterious effect.

PM5

A different missense change at this amino acid residue (c.728A>T, p.Asp243Val) has been reported in a Glanzmann thrombasthenia patient (PMID: 18832906). However this evidence was not counted toward the interpretation of the c.727G>C variant to avoid circularity.

PP4

This variant has been observed in three probands with a previous history of Glanzmann's thrombasthenia (GT-11 and GT-15 in PMID: 30792900 and Case 19 in PMID: 32680510), but sufficient platelet aggregation and surface protein expression information was not provided to apply PP4 at any strength level.

Approved on: 2021-04-20

Published on: 2021-08-20

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