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GP1BA

Synonyms
BDPLT1, BDPLT3, BSS, CD42B, CD42b-alpha, DBPLT3, GP1B, GPIbA, GPIbalpha, VWDP
External resources
Summary
Glycoprotein Ib (GP Ib) is a platelet surface membrane glycoprotein composed of a heterodimer, an alpha chain and a beta chain, that is linked by disulfide bonds. The Gp Ib functions as a receptor for von Willebrand factor (VWF). The complete receptor complex includes noncovalent association of the alpha and beta subunits with platelet glycoprotein IX and platelet glycoprotein V. The binding of the GP Ib-IX-V complex to VWF facilitates initial platelet adhesion to vascular subendothelium after vascular injury, and also initiates signaling events within the platelet that lead to enhanced platelet activation, thrombosis, and hemostasis. This gene encodes the alpha subunit. Mutations in this gene result in Bernard-Soulier syndromes and platelet-type von Willebrand disease. The coding region of this gene is known to contain a polymophic variable number tandem repeat (VNTR) domain that is associated with susceptibility to nonarteritic anterior ischemic optic neuropathy.

Variant counts

The variants found in rare patients tested by 3billion are classified and counted according to ACMG guidelines. The variants with over 5% variant frequency in population genome databases ( gnomAD, dbSNP, etc) are excluded.

Pathogenic
1
Likely pathogenic
7
VUS
2,210
Likely benign
559
Benign
12

Patient phenotypes

Proportions of phenotypes among 8 patients carrying pathogenic or likely pathogenic variants on GP1BA gene are displayed below.

Phenotype class
Patients in 3billion (%)
Abnormality of the eye
37.5%
Abnormality of blood and blood-forming tissues
25%
Abnormality of head or neck
25%
Abnormality of the integument
25%
Abnormality of the nervous system
25%
Abnormality of limbs
12.5%
Abnormality of the cardiovascular system
12.5%
Abnormality of the genitourinary system
12.5%
Abnormality of the musculoskeletal system
12.5%
Growth abnormality
12.5%
Abnormal cellular phenotype
0%
Abnormality of metabolism homeostasis
0%
Abnormality of prenatal development or birth
0%
Abnormality of the breast
0%
Abnormality of the digestive system
0%
Abnormality of the ear
0%
Abnormality of the endocrine system
0%
Abnormality of the immune system
0%
Abnormality of the respiratory system
0%
Abnormality of the thoracic cavity
0%
Abnormality of the voice
0%
Constitutional symptom
0%
Neoplasm
0%

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