Why does phytanic acid accumulate?
An accumulation of phytanic acid is generally caused by Refsum disease, a rare neurological disorder due to an inherited genetic mutation in either the PHYH or PEX7 gene. The symptoms of phytanic acid accumulation include peripheral polyneuropathy, cerebellar ataxia, retinitis pigmentosa, anosmia, and hearing loss.
Where does Alpha oxidation occur?
peroxisome
Alpha oxidation of fatty acids occurs in the peroxisome as well; this metabolic pathway exists to degrade by-products of chlorophyll, a component of green vegetables in the diet. Phytanic acid is the primary molecule that requires the enzymes dedicated to alpha-oxidation.
What foods are high in phytanic acid?
Fish, lamb, beef, and dairy products are rich sources of phytanic acid. Restriction of dietary consumption to 10–20 mg/day is required to decrease serum levels.
Which disease is caused by deficiency of alpha-oxidation?
A single peroxisomal enzyme defect that causes deficiency of alpha-oxidation leads to accumulation of phytanic acid in blood and tissues of patients with Refsum disease.
Why is alpha-oxidation important in the brain?
Significance of alpha oxidation α- oxidation is important in the catabolism of branched-chain fatty acids. Oxidation of methylated fatty acid. Production of cerebronic acid which synthesizes cerebroside and sulfatides. Production of odd chain fatty acids.
What is Refsum’s disease?
Definition. Adult Refsum disease (ARD) is a rare genetic disease that causes weakness or numbness of the hands and feet (peripheral neuropathy). Due to a genetic abnormality, people with ARD disease lack the enzyme in peroxisomes that break down phytanic acid, a type of fat found in certain foods.
Does Omega oxidation produce energy?
It is observed that ω- and (ω-1)-oxidation of fatty acids are related to energy metabolism in some laboratory animals such as musk shrews and Mongolian gerbils.
Where does fatty acid oxidation occur?
Fatty acid oxidation mainly occurs in mitochondria and involves a repeated sequence of reactions that result in the conversion of fatty acids to acetyl-CoA. Fatty acids are mainly taken up by proximal tubule cells through CD36.
Which disorder is related to impaired alpha-oxidation?
α-Oxidation In Refsum’s disease, an autosomal recessive disorder, the defect is the deficiency of phytanoyl-CoA hydroxylase (Figure 16.5). Phytanic acid is a 20-carbon, branched-chain fatty acid derived from the polyprenyl plant alcohol phytol, which is present as an ester in chlorophyll.
How many people have Refsum?
Refsum disease occurs in approximately 1 in 1,000,000 people.