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Reviewed August 2010

What is the official name of the ALOX12B gene?

The official name of this gene is “arachidonate 12-lipoxygenase, 12R type.”

ALOX12B is the gene's official symbol. The ALOX12B gene is also known by other names, listed below.

Read more about gene names and symbols on the About page.

What is the normal function of the ALOX12B gene?

The ALOX12B gene provides instructions for making an enzyme called 12R-LOX. This enzyme is part of a family of enzymes called arachidonate lipoxygenases. Most of these enzymes help add an oxygen molecule to a certain fatty acid called arachidonic acid. The addition of an oxygen molecule to arachidonic acid produces substances called fatty acid hydroperoxides, which can be transformed into a variety of signaling molecules. Specifically, the 12R-LOX enzyme helps add an oxygen molecule to arachidonic acid to make a substance called 12R-hydroperoxyeicosatetraenoic acid (12R-HPETE). 12R-HPETE is later converted to a signaling molecule that is involved in the growth and division (proliferation) and specialization (differentiation) of skin cells.

The 12R-LOX 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.

Does the ALOX12B gene share characteristics with other genes?

The ALOX12B gene belongs to a family of genes called ALOX (arachidonate lipoxygenases).

A gene family is a group of genes that share important characteristics. Classifying individual genes into families helps researchers describe how genes are related to each other. For more information, see What are gene families? in the Handbook.

How are changes in the ALOX12B gene related to health conditions?

nonbullous congenital ichthyosiform erythroderma - caused by mutations in the ALOX12B gene

More than 30 mutations in the ALOX12B gene have been found to cause nonbullous congenital ichthyosiform erythroderma (NBCIE). Most of these mutations change single protein building blocks (amino acids) in the 12R-LOX enzyme. Many ALOX12B gene mutations lead to the production of a nonfunctional 12R-LOX enzyme, which impairs the formation of the lipid membrane of the cells within the epidermis. Problems with this protective barrier underlie the skin abnormalities and other features of NBCIE.

other disorders - caused by mutations in the ALOX12B gene

Another form of ichthyosis called self-healing collodion baby has been found to be caused by ALOX12B gene mutations. Individuals with this condition are born with a tight, clear sheath covering their skin called a collodion membrane. This membrane is usually shed during the first few weeks of life, and affected infants often show near normal skin within a few months.

Only a few people diagnosed with self-healing collodion baby have been found to have ALOX12B gene mutations; the majority of cases are caused by mutations in other genes.

Where is the ALOX12B gene located?

Cytogenetic Location: 17p13.1

Molecular Location on chromosome 17: base pairs 8,072,636 to 8,087,703

(Homo sapiens Annotation Release 107, GRCh38.p2) (NCBIThis link leads to a site outside Genetics Home Reference.)

The ALOX12B gene is located on the short (p) arm of chromosome 17 at position 13.1.

The ALOX12B gene is located on the short (p) arm of chromosome 17 at position 13.1.

More precisely, the ALOX12B gene is located from base pair 8,072,636 to base pair 8,087,703 on chromosome 17.

See How do geneticists indicate the location of a gene? in the Handbook.

Where can I find additional information about ALOX12B?

You and your healthcare professional may find the following resources about ALOX12B helpful.

You may also be interested in these resources, which are designed for genetics professionals and researchers.

What other names do people use for the ALOX12B gene or gene products?

  • 12R-lipoxygenase
  • 12R-LOX
  • arachidonate 12-lipoxygenase, 12R-type
  • epidermis-type lipoxygenase 12

Where can I find general information about genes?

The Handbook provides basic information about genetics in clear language.

These links provide additional genetics resources that may be useful.

What glossary definitions help with understanding ALOX12B?

acids ; congenital ; differentiation ; enzyme ; epidermis ; erythroderma ; gene ; ichthyosiform ; ichthyosis ; infection ; lipid ; molecule ; oxygen ; proliferation ; protein

You may find definitions for these and many other terms in the Genetics Home Reference Glossary.

See also Understanding Medical Terminology.

References (8 links)


The resources on this site should not be used as a substitute for professional medical care or advice. Users seeking information about a personal genetic disease, syndrome, or condition should consult with a qualified healthcare professional. See How can I find a genetics professional in my area? in the Handbook.

Reviewed: August 2010
Published: February 8, 2016