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UniProtKB/Swiss-Prot P02675: Variant p.Arg196Cys

Fibrinogen beta chain
Gene: FGB
Variant information

Variant position:  196
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 Arginine (R) to Cysteine (C) at position 196 (R196C, p.Arg196Cys).
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 large size and basic (R) to medium size and polar (C)
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:10666208, ECO:0000269|PubMed:11468164, ECO:0000269|PubMed:15070683, ECO:0000269|PubMed:25427968}. Note=The disease is caused by mutations affecting the gene represented in this entry. Patients with congenital fibrinogen abnormalities can manifest different clinical pictures. Some cases are clinically silent, some show a tendency toward bleeding and some show a predisposition for thrombosis with or without bleeding.
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; fibrinogen Longmont.
Any additional useful information about the variant.

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



Sequence information

Variant position:  196
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  491
The length of the canonical sequence.

Location on the sequence:   LEKHQLYIDETVNSNIPTNL  R VLRSILENLRSKIQKLESDV
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                         LEKHQLYIDETVNSNIPTNLRVLRSILENLRSKIQKLESDV

Mouse                         LEDQRLYIDETVNDNIPLNLRVLRSILEDLRSKIQKLESDI

Rat                           LEDQKLYIDETVNDNIPLNLRVLRSILEDLRSKIQKLESDI

Bovine                        LEKHQLYIDETVKNNIPTKLRVLRSILENLRSKIQKLESDV

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 45 – 491 Fibrinogen beta chain
Coiled coil 157 – 222
Helix 190 – 222


Literature citations

The impaired polymerization of fibrinogen Longmont (Bbeta166Arg-->Cys) is not improved by removal of disulfide-linked dimers from a mixture of dimers and cysteine-linked monomers.
Lounes K.C.; Lefkowitz J.B.; Henschen-Edman A.H.; Coates A.I.; Hantgan R.R.; Lord S.T.;
Blood 98:661-666(2001)
Cited for: VARIANT CAFBN CYS-196;

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.