UniProtKB/Swiss-Prot P02768: Variant p.Arg242His

Serum albumin
Gene: ALB
Chromosomal location: 4q11-q13
Variant information

Variant position:  242
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 have been found in patients and disease-association is reported in literature. However, this classification is not a definitive assessment of variant pathogenicity.
  • Polymorphism: No disease-association has been reported.
  • Unclassified: Variants have been found in patients but disease-association remains unclear.

Residue change:  From Arginine (R) to Histidine (H) at position 242 (R242H, p.Arg242His).
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 (H)
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:  Dysalbuminemic hyperthyroxinemia (DH) [MIM:103600]: A disorder characterized by abnormally elevated levels of total serum thyroxine (T4) in euthyroid patients. It is due to abnormal serum albumin that binds T4 with enhanced affinity. {ECO:0000269|PubMed:7852505, ECO:0000269|PubMed:8048949, ECO:0000269|PubMed:9329347, ECO:0000269|PubMed:9589637}. 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 DH.
Any additional useful information about the variant.



Sequence information

Variant position:  242
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  609
The length of the canonical sequence.

Location on the sequence:   LKCASLQKFGERAFKAWAVA  R LSQRFPKAEFAEVSKLVTDL
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.

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 25 – 609 Serum albumin
Domain 211 – 403 Albumin 2
Site 223 – 223 Aspirin-acetylated lysine
Site 229 – 229 Not glycated
Site 236 – 236 Not glycated
Glycosylation 223 – 223 N-linked (Glc) (glycation); in vitro
Glycosylation 249 – 249 N-linked (Glc) (glycation); in vitro
Glycosylation 257 – 257 N-linked (Glc) (glycation)
Disulfide bond 224 – 270
Helix 232 – 246


Literature citations

An identical missense mutation in the albumin gene results in familial dysalbuminemic hyperthyroxinemia in 8 unrelated families.
Sunthornthepvarakul T.; Angkeow P.; Weiss R.E.; Hayashi Y.; Retetoff S.;
Biochem. Biophys. Res. Commun. 202:781-787(1994)
Cited for: VARIANT DH HIS-242;

Identification of a human serum albumin species associated with familial dysalbuminemic hyperthyroxinemia.
Rushbrook J.I.; Becker E.; Schussler G.C.; Divino C.M.;
J. Clin. Endocrinol. Metab. 80:461-467(1995)
Cited for: VARIANT DH HIS-242; PROTEIN SEQUENCE OF 25-51;

A novel missense mutation in codon 218 of the albumin gene in a distinct phenotype of familial dysalbuminemic hyperthyroxinemia in a Japanese kindred.
Wada N.; Chiba H.; Shimizu C.; Kijima H.; Kubo M.; Koike T.;
J. Clin. Endocrinol. Metab. 82:3246-3250(1997)
Cited for: VARIANT DH HIS-242;

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.