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Platelet glycoprotein Ib (GPIb) is a heterodimeric transmembrane protein consisting of a disulfide-linked 140 kD alpha chain and 22 kD beta chain. It is part of the GPIb-V-IX system that constitutes the receptor for von Willebrand factor (VWF), and mediates platelet adhesion in the arterial circulation. GPIb alpha chain provides the VWF binding site, and GPIb beta contributes to surface expression of the receptor and participates in transmembrane signaling through phosphorylation of its intracellular domain. Mutations in the GPIb beta subunit have been associated with Bernard-Soulier syndrome, velocardiofacial syndrome and giant platelet disorder. The 206 amino acid precursor of GPIb beta is synthesized from a 1.0 kb mRNA expressed in plateletes and megakaryocytes. A 411 amino acid protein arising from a longer, unspliced transcript in endothelial cells has been described; however, the authenticity of this product has been questioned. Yet another less abundant GPIb beta mRNA species of 3.5 kb, expressed in nonhematopoietic tissues such as endothelium, brain and heart, was shown to result from inefficient usage of a non-consensus polyA signal in the neighboring upstream gene (SEPT5, septin 5). In the absence of polyadenylation from its own imperfect site, the SEPT5 gene produces read-through transcripts that use the consensus polyA signal of this gene. [provided by RefSeq, Dec 2010]
GP1BB (Glycoprotein Ib Platelet Subunit Beta) is a Protein Coding gene. Diseases associated with GP1BB include Bernard-Soulier Syndrome and Autosomal Dominant Macrothrombocytopenia. Among its related pathways are Formation of Fibrin Clot (Clotting Cascade) and Platelet Aggregation Inhibitor Pathway, Pharmacodynamics. Gene Ontology (GO) annotations related to this gene include transmembrane signaling receptor activity. An important paralog of this gene is GP9.
GO ID | Qualified GO term | Evidence | PubMed IDs |
---|---|---|---|
GO:0004888 | transmembrane signaling receptor activity | NAS | 3353370 |
GO:0005515 | protein binding | IPI | 4044584 |
GO:0042802 | identical protein binding | IPI | 18674540 |
GO ID | Qualified GO term | Evidence | PubMed IDs |
---|---|---|---|
GO:0005886 | plasma membrane | TAS | -- |
GO:0005887 | integral component of plasma membrane | NAS | 3353370 |
GO:0016020 | membrane | IEA | -- |
GO:0016021 | integral component of membrane | IEA | -- |
SuperPathway | Contained pathways | ||
---|---|---|---|
1 | Formation of Fibrin Clot (Clotting Cascade) | ||
2 | Response to elevated platelet cytosolic Ca2+ |
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3 | ECM-receptor interaction | ||
4 | Hematopoietic cell lineage | ||
5 | Platelet activation |
GO ID | Qualified GO term | Evidence | PubMed IDs |
---|---|---|---|
GO:0007155 | cell adhesion | IEA | -- |
GO:0007166 | cell surface receptor signaling pathway | NAS | 3353370 |
GO:0007596 | blood coagulation | TAS | -- |
GO:0007597 | blood coagulation, intrinsic pathway | TAS | -- |
GO:0007599 | hemostasis | IEA | -- |
This gene was present in the common ancestor of chordates.
Organism | Taxonomy | Gene | Similarity | Type | Details |
---|---|---|---|---|---|
Chimpanzee (Pan troglodytes) |
Mammalia | GP1BB 31 |
|
OneToOne | |
Mouse (Mus musculus) |
Mammalia | Gp1bb 30 17 31 |
|
OneToOne | |
Dog (Canis familiaris) |
Mammalia | GP1BB 30 31 |
|
OneToOne | |
Rat (Rattus norvegicus) |
Mammalia | Gp1bb 30 |
|
||
Cow (Bos Taurus) |
Mammalia | GP1BB 31 |
|
OneToOne | |
Chicken (Gallus gallus) |
Aves | GP1BB 31 |
|
OneToOne | |
Lizard (Anolis carolinensis) |
Reptilia | GP1BB 31 |
|
OneToOne | |
Tropical Clawed Frog (Silurana tropicalis) |
Amphibia | gp1bb 30 |
|
||
Zebrafish (Danio rerio) |
Actinopterygii | gp1bb 30 31 |
|
OneToOne |
SNP ID | Clinical significance and condition | Chr 22 pos | Variation | AA Info | Type |
---|---|---|---|---|---|
626963 | Uncertain Significance: Abnormal bleeding | 19,723,949(+) | C/T | MISSENSE_VARIANT,NON_CODING_TRANSCRIPT_VARIANT | |
627039 | Likely Pathogenic: Thrombocytopenia | 19,724,070(+) | ACGCGCTGCC/A | NON_CODING_TRANSCRIPT_VARIANT,INFRAME_DELETION | |
627056 | Likely Pathogenic: Thrombocytopenia; Macrothrombocytopenia | 19,724,238(+) | T/A | MISSENSE_VARIANT,NON_CODING_TRANSCRIPT_VARIANT | |
627061 | Uncertain Significance: Thrombocytopenia | 19,724,250(+) | A/G | MISSENSE_VARIANT,NON_CODING_TRANSCRIPT_VARIANT | |
627068 | Uncertain Significance: Thrombocytopenia | 19,724,277(+) | C/G | MISSENSE_VARIANT,NON_CODING_TRANSCRIPT_VARIANT |
Variant ID | Type | Subtype | PubMed ID |
---|---|---|---|
dgv725n67 | CNV | gain | 20364138 |
esv22571 | CNV | loss | 19812545 |
esv2751940 | CNV | gain | 17911159 |
esv3575418 | CNV | gain | 25503493 |
esv3647279 | CNV | gain | 21293372 |
esv3893434 | CNV | gain | 25118596 |
nsv517478 | CNV | loss | 19592680 |
nsv588216 | CNV | gain | 21841781 |
nsv828938 | CNV | gain | 20364138 |
nsv828939 | CNV | loss | 20364138 |
nsv828943 | CNV | loss | 20364138 |
nsv834128 | CNV | loss | 17160897 |
nsv834129 | CNV | loss | 17160897 |
nsv953023 | CNV | deletion | 24416366 |
Disorder | Aliases | PubMed IDs |
---|---|---|
bernard-soulier syndrome |
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autosomal dominant macrothrombocytopenia |
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thrombocytopenia |
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velocardiofacial syndrome |
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fetal and neonatal alloimmune thrombocytopenia |
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