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UniProtKB/Swiss-Prot P02671: Variant p.Cys55Arg

Fibrinogen alpha chain
Gene: FGA
Chromosomal location: 4q28
Variant information

Variant position:  55
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 Cysteine (C) to Arginine (R) at position 55 (C55R, p.Cys55Arg).
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 medium size and polar (C) to large size and basic (R)
The physico-chemical property of the reference and variant residues and the change implicated.

BLOSUM score:  -3
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:  Congenital afibrinogenemia (CAFBN) [MIM:202400]: Rare autosomal recessive disorder is characterized by bleeding that varies from mild to severe and by complete absence or extremely low levels of plasma and platelet fibrinogen. {ECO:0000269|PubMed:25427968}. Note=The disease is caused by mutations affecting the gene represented in this entry. The majority of cases of afibrinogenemia are due to truncating mutations. Variations in position Arg-35 (the site of cleavage of fibrinopeptide a by thrombin) leads to alpha-dysfibrinogenemias.
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 CAFBN; hypofibrinogenemia; heterozygous; decreased fibrinogen complex assembly; no effect on fibrinogen complex secretion.
Any additional useful information about the variant.

Sequence information

Variant position:  55
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  866
The length of the canonical sequence.

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.






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.

Chain 36 – 866 Fibrinogen alpha chain
Modified residue 45 – 45 Phosphoserine; by FAM20C
Modified residue 50 – 50 Phosphoserine
Modified residue 56 – 56 Phosphoserine; by FAM20C
Disulfide bond 47 – 47 Interchain
Disulfide bond 55 – 55 Interchain (with C-95 in beta chain)
Disulfide bond 64 – 64 Interchain (with C-49 in gamma chain)
Disulfide bond 68 – 68 Interchain (with C-106 in beta chain)

Literature citations

Clinical and molecular characterisation of 21 patients affected by quantitative fibrinogen deficiency.
Asselta R.; Plate M.; Robusto M.; Borhany M.; Guella I.; Solda G.; Afrasiabi A.; Menegatti M.; Shamsi T.; Peyvandi F.; Duga S.;
Thromb. Haemost. 113:567-576(2015)

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.