Familial hibernian fever (FHF) [MIM:142680]: A hereditary periodic fever syndrome characterized by recurrent fever, abdominal pain, localized tender skin lesions and myalgia. Reactive amyloidosis is the main complication and occurs in 25% of cases. {ECO:0000269|PubMed:10199409, ECO:0000269|PubMed:10902757, ECO:0000269|PubMed:11443543, ECO:0000269|PubMed:13130484, ECO:0000269|PubMed:14610673}. Note=The disease is caused by mutations affecting the gene represented in this entry.; Multiple sclerosis 5 (MS5) [MIM:614810]: A multifactorial, inflammatory, demyelinating disease of the central nervous system. Sclerotic lesions are characterized by perivascular infiltration of monocytes and lymphocytes and appear as indurated areas in pathologic specimens (sclerosis in plaques). The pathological mechanism is regarded as an autoimmune attack of the myelin sheath, mediated by both cellular and humoral immunity. Clinical manifestations include visual loss, extra-ocular movement disorders, paresthesias, loss of sensation, weakness, dysarthria, spasticity, ataxia and bladder dysfunction. Genetic and environmental factors influence susceptibility to the disease. {ECO:0000269|PubMed:22801493}. Note=Disease susceptibility is associated with variations affecting the gene represented in this entry. An intronic mutation affecting alternative splicing and skipping of exon 6 directs increased expression of isoform 4 a transcript encoding a C-terminally truncated protein which is secreted and may function as a TNF antagonist.