OMIA 000815-9685 : Porphyria, unclassified in Felis catus

In other species: pig

Possibly relevant human trait(s) and/or gene(s)s (MIM numbers): 125270 , 176000 , 176090 , 176200

Mendelian trait/disorder: yes

Considered a defect: yes

Key variant known: no

Cross-species summary: Porphyrins are a class of organic compounds characterised by four pyrrole nuclei connected in a ring structure. When combined with iron, porphyrins form haem, which is a component of haemoglobin, cytochromes, catalases and peroxidases. Thus, porphyrins are constituents of many compounds that play a vital role in biological systems. The biosynthesis of porphyrins involves a six-step process, starting with aminolaevulinic acid (ALA) and ending with protoporphyrin. Each step is catalysed by an enzyme. A deficiency of any one of these enzymes results in a buildup of intermediates prior to the step for which the enzyme is lacking, and a deficiency of intermediates after that step. In much of the literature, these intermediates are loosely called porphyrins. Porphyria is a general term for disorders resulting from a deficiency in any one of the enzymes in the porphyrin pathway, and a consequent buildup of intermediates (i.e. a buildup of porphyrins). Each enzyme deficiency gives rise to a distinct disorder. The six enzymes (in order), together with their deficiency disorders are: ALA dehydratase (Doss porphyria); porphobilinogen deaminase (Acute intermittent porphyria); urporphyrinogen II cosynthetase (Porphyria, congenital erythropoietic); uroporphyrinogen decarboxylase (Porphyria cutanea tarda); coproporphyrinogen III oxidase (Hereditary coproporphyria); protoporphyrinogen oxidase (Varigate porphyria). Some porphyrins are extemely photoreactive. Because of this, photosensitivity is a clinical sign of some of these disorders. Another major common clinical sign is haemolytic anaemia, due to a deficiency of haemoglobin. In some cases, the buildup of porphyrins results in a characteristic red staining of teeth, bones and urine.

References


Note: the references are listed in reverse chronological order (from the most recent year to the earliest year), and alphabetically by first author within a year.
2010 Schnier, J.J., Hanna, P. :
Feline porphyria associated with anemia, severe hepatic disease, and renal calculi. Can Vet J 51:1146-51, 2010. Pubmed reference: 21197209.
1990 Watson, A.D.J. :
Feline Precursor Porphyria, Characterised by Persistent Delta Aminolevulinic Aciduria Journal of Small Animal Practice 31:393-397, 1990.

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  • Created by Frank Nicholas on 06 Sep 2005