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UniProtKB/Swiss-Prot P07359: Variant p.Ala172Val

Platelet glycoprotein Ib alpha chain
Gene: GP1BA
Chromosomal location: 17pter-p12
Variant information

Variant position:  172
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Type of variant:  Disease [Disclaimer]
The variants are classified into three categories: Disease, Polymorphism and Unclassified.
  • Disease: Variants implicated in disease according to literature reports.
  • Polymorphism: Variants not reported to be implicated in disease.
  • Unclassified: Variants with uncertain implication in disease according to literature reports. Evidence against or in favor of a pathogenic role is limited and/or conflicting.

Residue change:  From Alanine (A) to Valine (V) at position 172 (A172V, p.Ala172Val).
Indicates the amino acid change of the variant. The one-letter and three-letter codes for amino acids used in UniProtKB/Swiss-Prot are those adopted by the commission on Biochemical Nomenclature of the IUPAC-IUB.

Physico-chemical properties:  Change from small size and hydrophobic (A) to medium size and hydrophobic (V)
The physico-chemical property of the reference and variant residues and the change implicated.

BLOSUM score:  0
The score within a Blosum matrix for the corresponding wild-type to variant amino acid change. The log-odds score measures the logarithm for the ratio of the likelihood of two amino acids appearing by chance. The Blosum62 substitution matrix is used. This substitution matrix contains scores for all possible exchanges of one amino acid with another:
  • Lowest score: -4 (low probability of substitution).
  • Highest score: 11 (high probability of substitution).
More information can be found on the following page

Involvement in disease:  Bernard-Soulier syndrome (BSS) [MIM:231200]: A coagulation disorder characterized by a prolonged bleeding time, unusually large platelets, thrombocytopenia, and impaired prothrombin consumption. {ECO:0000269|PubMed:10089893, ECO:0000269|PubMed:1730088, ECO:0000269|PubMed:7690774, ECO:0000269|PubMed:7819107, ECO:0000269|PubMed:7873390, ECO:0000269|PubMed:9639514}. Note=The disease is caused by mutations affecting the gene represented in this entry.
The name and a short description of the disease associated with the variant. For more information about the disease, the user can refer to OMIM, following the link provided after the disease acronym.

Involvement in disease:  Bernard-Soulier syndrome A2, autosomal dominant (BSSA2) [MIM:153670]: A coagulation disorder characterized by mild to moderate bleeding tendency, thrombocytopenia, and an increased mean platelet volume. Some individuals have no symptoms. Mild bleeding tendencies manifest as epistaxis, gingival bleeding, menorrhagia, easy bruising, or prolonged bleeding after dental surgery. {ECO:0000269|PubMed:11222377}. Note=The disease is caused by mutations affecting the gene represented in this entry.
The name and a short description of the disease associated with the variant. For more information about the disease, the user can refer to OMIM, following the link provided after the disease acronym.

Variant description:  In BSS and BSSA2.
Any additional useful information about the variant.

Other resources:  
Links to websites of interest for the variant.



Sequence information

Variant position:  172
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  652
The length of the canonical sequence.

Location on the sequence:   LKTLPPGLLTPTPKLEKLSL  A NNNLTELPAGLLNGLENLDT
The residue change on the sequence. Unless the variant is located at the beginning or at the end of the protein sequence, both residues upstream (20) and downstream (20) of the variant will be shown.

Residue conservation: 
The multiple alignment of the region surrounding the variant against various orthologous sequences.

Human                         LKTLPPGLLTPTPKLEKLSLANNNLTELPAGLLNGLENLDT

                              LKTLPPRLLAPTAQLRKLNLADNRLTELPPGFLEGLGELDT

Mouse                         LKSLPPGLLLPTTKLKKLNLANNKLRELPSGLLDGLEDLDT

Sequence annotation in neighborhood:  
The regions or sites of interest surrounding the variant. In general the features listed are posttranslational modifications, binding sites, enzyme active sites, local secondary structure or other characteristics reported in the cited references. The "Sequence annotation in neighborhood" lines have a fixed format:
  • Type: the type of sequence feature.
  • Positions: endpoints of the sequence feature.
  • Description: contains additional information about the feature.

TypePositionsDescription
Chain 17 – 652 Platelet glycoprotein Ib alpha chain
Chain 17 – 506 Glycocalicin
Topological domain 17 – 531 Extracellular
Repeat 165 – 186 LRR 6
Glycosylation 175 – 175 N-linked (GlcNAc...) asparagine


Literature citations

Point mutation in a leucine-rich repeat of platelet glycoprotein Ib alpha resulting in the Bernard-Soulier syndrome.
Ware J.; Russell S.R.; Marchese P.; Murata M.; Mazzucato M.; de Marco L.; Ruggeri Z.M.;
J. Clin. Invest. 92:1213-1220(1993)
Cited for: VARIANT BSS VAL-172;

Autosomal dominant macrothrombocytopenia in Italy is most frequently a type of heterozygous Bernard-Soulier syndrome.
Savoia A.; Balduini C.L.; Savino M.; Noris P.; Del Vecchio M.; Perrotta S.; Belletti S.; Poggi V.; Iolascon A.;
Blood 97:1330-1335(2001)
Cited for: VARIANT BSSA2 VAL-172;

Disclaimer: Any medical or genetic information present in this entry is provided for research, educational and informational purposes only. They are not in any way intended to be used as a substitute for professional medical advice, diagnostic, treatment or care.