PAPA syndrome is an acronym for Pyogenic Arthritis, Pyoderma gangrenosum and Acne. It is a rare genetic disorder characterised by its effects on skin and joints.
PAPA syndrome is inherited in an autosomal dominant fashion, which means that there is a 50% chance that a child will inherit the disease from an affected parent. It usually begins with arthritis at a young age, with the skin changes more prominent from the time of puberty.
Recently the responsible gene has been identified on Chromosome 15. Two mutations have been found in a protein called CD2 binding protein 1 (CD2BP1). This protein is part of an inflammatory pathway associated with other autoinflammatory syndromes such as familial Mediterranean fever, hyper-IgD (HIDS) and periodic fever syndrome, Muckle-Wells syndrome (MWS), neonatal onset multisystem inflammatory disease and familial cold autoinflammatory syndrome (FCAS). The exact mechanism of how the mutated gene causes the disease is still being investigated.
How is it diagnosed?
The clinical features along with the familial tendency may be enough to make a diagnosis, though gene testing may be available at some centres.
The arthritis is the predominant feature, noted by its juvenile onset and destructive course. Individuals often recall episodes of arthritis precipitated by a traumatic event. With repeated episodes the joints become damaged with multiple joint replacements required. Hopefully with improved treatment options the damage will be limited in new cases.
Pyoderma gangrenosum is variably expressed, which means that it is not always present in all individuals with the disease. It presents as poorly healing ulcers with undermined edges. Pathergy is an important feature (this term refers to the tendency of ulcers to arise at points of injury). There are reports of lesions developing at the site of a joint replacement wound, central venous line and intravenous drip insertion.
Prominent inflammation is seen in affected tissues, with a predominance of neutrophil white blood cells within a synovial biopsy (joint tissue) and skin biopsy. Biopsies of pyoderma gangrenosum show superficial ulceration as well as neutrophilic inflammation.
Developments in the treatment of the arthritis and pyoderma gangrenosum are largely in the area of biological response modifiers. These are drugs directed at particular inflammatory proteins (cytokines), and have shown success in the treatment of other inflammatory conditions like rheumatoid arthritis and psoriasis.
- OMIM – Online Mendelian Inheritance in Man (search term PAPA syndrome)
- Lindor NM, Arsenault TM, Solomon H, Seidman CE, McEvoy MT. A new autosomal dominant disorder of pyogenic sterile arthritis, pyoderma gangrenosum, and acne: PAPA Syndrome. Mayo Clin Proc 1997; 72:611-5.
- Wise CA, Bennett LB, Pascual V, Gillum JD, Bowcock AM. Localization of a gene for familial recurrent arthritis. Arthritis Rheum. 2000 Sep; 43(9):2041-5.
- Cortis E, De Benedetti F, Insalaco A, Cioschi S, Muratori F, D’Urbano LE, Ugazio AG. Abnormal production of the tumour necrosis factor alpha and clinical efficacy of the TNF Inhibitor Etanercept in a patient with PAPA syndrome. J Pediatr. 2004 Dec; 145 (6): 851-5. Erratum in: J Pediatr. 2005 Feb; 146(2):193.
- Yeon HB, Lindor HM, Seidman JG, Seidman CE et al.Pyogenic Arthritis, Pyoderma Gangrenosum, and Acne Syndrome Maps to Chromosome 15q. Am J Hum Genet 2000; 66:1443-8.
- Wise CA, Gillum JD, Seidman CE, Lindor NM, Veile R, Bashiardes S, Lovett M. Mutations in CD2BP1 disrupt binding to PTP PEST and are responsible for PAPA syndrome, an autoinflammatory disorder. Hum Mol Genet. 2002 Apr 15; 11(8): 961-9
- Shoham NG, Centola M, Mansfield E, Hull KM, Wood G, Wise CA, Kastner DL. Pyrin binds the PSTPIP1/CD2BP1 protein, defining familial Mediterranean fever and PAPA syndrome as disorders in the same pathway. Proc Natl Acad Sci USA. 2003 Nov 11; 100(23): 13501-6.
- McDermott MF, Aksentijevich I. The Autoinflammatory syndromes. Curr Opin Allergy Clin Immunol 2002; 2(6): 511-516.
- Dierselhuis MP, Frenkel J, Wulffraat NM, Boelens JJ. Anakinra for flares of pyogenic arthritis in PAPA syndrome. Rheumatology (Oxford). 2005 Jan 5;(Epub ahead of print)
- Stichweh DS, Punaro M, Pascual V. Dramatic improvement of pyoderma gangrenosum with infliximab in a patient with PAPA Syndrome. 2005 May-Jun; 22(3): 262-5.
On DermNet NZ:
- Skin signs of systemic disease
- Autoinflammatory syndromes
- Periodic fever syndromes
- Monogenic autoinflammatory syndromes
- Pyoderma gangrenosum
- Nodulocystic acne
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