arachidonate lipoxygenase 3
The ALOXE3 gene provides instructions for making an enzyme called eLOX3. This enzyme is part of a family of enzymes called lipoxygenases. Most enzymes in this family help add an oxygen molecule to certain fatty acids to produce substances called fatty acid hydroperoxides.
Unlike other lipoxygenases, the eLOX3 enzyme does not act directly on fatty acids. Instead, it processes the product of another lipoxygenase reaction, a fatty acid hydroperoxide. The substance produced is later converted to a signaling molecule that is involved in the growth and division (proliferation) and specialization (differentiation) of skin cells.
The eLOX3 enzyme is thought to play a role in the formation and maintenance of the fat (lipid) membrane of the cells that make up the outermost layer of the skin (the epidermis). The epidermis helps prevent water loss, regulates body temperature, and protects against infection.
At least 10 mutations in the ALOXE3 gene have been found to cause nonbullous congenital ichthyosiform erythroderma (NBCIE). Most of these mutations change single protein building blocks (amino acids) in the eLOX3 enzyme. Many ALOXE3 gene mutations lead to the production of a nonfunctional eLOX3 enzyme, which impairs the formation of the lipid membrane of cells within the epidermis. Problems with this protective barrier underlie the skin abnormalities and other features of NBCIE.
- epidermal lipoxygenase