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UniProtKB/Swiss-Prot P06132: Variant p.Gly318Arg

Uroporphyrinogen decarboxylase
Gene: UROD
Variant information

Variant position:  318
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 Glycine (G) to Arginine (R) at position 318 (G318R, p.Gly318Arg).
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 glycine (G) to large size and basic (R)
The physico-chemical property of the reference and variant residues and the change implicated.

BLOSUM score:  -2
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:  Familial porphyria cutanea tarda (FPCT) [MIM:176100]: A form of porphyria. Porphyrias are inherited defects in the biosynthesis of heme, resulting in the accumulation and increased excretion of porphyrins or porphyrin precursors. They are classified as erythropoietic or hepatic, depending on whether the enzyme deficiency occurs in red blood cells or in the liver. Familial porphyria cutanea tarda is an autosomal dominant disorder characterized by light-sensitive dermatitis, with onset in later life. It is associated with the excretion of large amounts of uroporphyrin in the urine. Iron overload is often present in association with varying degrees of liver damage. {ECO:0000269|PubMed:10338097, ECO:0000269|PubMed:10477430, ECO:0000269|PubMed:11069625, ECO:0000269|PubMed:11295834, ECO:0000269|PubMed:11719352, ECO:0000269|PubMed:2243121, ECO:0000269|PubMed:2920211, ECO:0000269|PubMed:7706766, ECO:0000269|PubMed:8896428, ECO:0000269|PubMed:9792863}. 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 FPCT.
Any additional useful information about the variant.

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



Sequence information

Variant position:  318
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  367
The length of the canonical sequence.

Location on the sequence:   TVTLQGNLDPCALYASEEEI  G QLVKQMLDDFGPHRYIANLG
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                         T-VTLQGNLDPCALYASEEEIGQLVKQMLDDFG--PHRYIANLG

Mouse                         A-VTLQGNLDPCALYASEEEIGRLVQQMLDDFG--PQRYIA

Sheep                         T-VTLQGNLDPCALYASEEEIGKLVQQMLNDFG--PQRYIA

Zebrafish                     K-VSLQGNMDPCALYGTKESISEIVRRMLEGFG--TKGYIA

Drosophila                    N-ITLQGNLDPQDMYRDPDELRNLTTEMVHKFG--KSRYIA

Slime mold                    R-VSLQGNLDPCVLYCGDQVIRDQTQKMLQSFG-TTKRLIA

Baker's yeast                 R-VTLQGNLDPGVMYGSKEVITKKVKQMIEAFGGGKSRYIV

Fission yeast                 RRVTFQGNLDPNILYGTREIIEARTKEMIQDFGGGKQGYII

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 1 – 367 Uroporphyrinogen decarboxylase
Helix 314 – 328


Literature citations

Five new mutations in the uroporphyrinogen decarboxylase gene identified in families with cutaneous porphyria.
McManus J.F.; Begley C.G.; Sassa S.; Ratnaike S.;
Blood 88:3589-3600(1996)
Cited for: VARIANT HEP GLY-80; VARIANTS FPCT GLN-253; ARG-318 AND THR-334;

Co-inheritance of mutations in the uroporphyrinogen decarboxylase and hemochromatosis genes accelerates the onset of porphyria cutanea tarda.
Brady J.J.; Jackson H.A.; Roberts A.G.; Morgan R.R.; Whatley S.D.; Rowlands G.L.; Darby C.; Shudell E.; Watson R.; Paiker J.; Worwood M.W.; Elder G.H.;
J. Invest. Dermatol. 115:868-874(2000)
Cited for: VARIANTS FPCT SER-80; GLN-134; PRO-144; GLN-216; LYS-218; VAL-281; ARG-282; SER-303 AND ARG-318; CHARACTERIZATION OF VARIANTS FPCT PRO-144 AND LYS-218;

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.