Fas receptor

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The Fas receptor (FasR) is a death receptor on the surface of cells that leads to programmed cell death (apoptosis). It is one of two apoptosis pathways, the other being the mitochondrial pathway. FasR is also known as CD95, Apo-1, and tumor necrosis factor receptor superfamily, member 6 (TNFRSf6). FasR is located on chromosome 10 in humans and 19 in mice. Similar sequences related by evolution (orthologs) are found in most mammals.


This gene is also known as APO-1, Fas antigen, tumor necrosis factor receptor superfamily member 6 (TNFRSF6) or apoptosis antigen 1 (APT1).

It is located on the long arm of chromosome 10 (10q24.1) in humans and on chromosome 19 in mice. The gene lies on the plus (Watson strand) and is 25,255 bases in length organised into 9 protein encoding exons.


Previous reports have identified as many as eight splice variants, which are translated into seven isoforms of the protein. Apoptosis-inducing Fas receptor is dubbed isoform 1 and is a type 1 transmembrane protein. Many of the other isoforms are rare haplotypes that are usually associated with a state of disease. However, two isoforms, the apoptosis-inducing membrane-bound form and the soluble form, are normal products whose production via alternative splicing is regulated by the cytotoxic protein TIA1.

Molecular biology

The mature Fas protein has 319...
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