Generalized pustular psoriasis (GPP) is a severe form of a skin disorder called psoriasis. GPP and other forms of psoriasis are caused by abnormal inflammation. Inflammation is a normal immune system response to injury and foreign invaders (such as bacteria). However, when inflammation is abnormal and uncontrolled, it can damage the body's tissues and organs. Individuals with GPP have repeated episodes in which large areas of skin become red and inflamed and develop small pus-filled blisters (pustules). The skin problems can be accompanied by fever, extreme tiredness (fatigue), muscle weakness, an increased number of white blood cells, and other signs of inflammation throughout the body (systemic inflammation). The inflammation problems subside and reappear often. Episodes can be triggered by infection, exposure to or withdrawal from certain medications, menstruation, or pregnancy, although the trigger is often unknown. GPP can be life-threatening if not treated.
While many affected individuals have features only of GPP (called GPP alone), some develop features of another skin condition called psoriasis vulgaris (PV), either before or after GPP appears. PV, the most common form of psoriasis, is characterized by red, scaly patches of skin (plaques) on parts of the body.
GPP is the rarest form of psoriasis. Although the worldwide prevalence of GPP is unknown, the condition is estimated to affect 2 per million people in Europe. It also occurs in approximately 0.6 per million people each year in Japan.
Mutations in several genes, including IL36RN and CARD14, increase the risk of developing GPP. These two genes provide instructions for making proteins that play roles in regulating inflammation, particularly in the skin. The IL-36Ra protein, produced from the IL36RN gene, blocks the activity of specific proteins that trigger signaling pathways to promote skin inflammation. IL36RN gene mutations involved in GPP reduce the amount of IL-36Ra protein in the skin. Without control by IL-36Ra, signaling pathways that promote inflammation are overly active.
Conversely, the CARD14 protein normally turns on inflammation signaling. The CARD14 gene mutations associated with GPP increase the activity of the CARD14 protein, leading to uncontrolled inflammation signaling in the skin. Enhancement of these signaling pathways results in abnormal inflammatory reactions, which contribute to the skin problems and systemic inflammation characteristic of GPP.
IL36RN gene mutations are most often associated with GPP alone and are only rarely found in individuals who also have PV. Mutations in this gene appear to be the most common genetic risk factor for GPP alone. CARD14 gene mutations are more frequently found in individuals with both GPP and PV, although changes in this gene have also been found in individuals with GPP alone.
Many people with GPP do not have a mutation in the IL36RN or CARD14 gene. Mutations in other genes, some of which have not been identified, may also be associated with the condition. Having a gene mutation in one of the associated genes does not mean an individual will have GPP. Researchers suspect that environmental or other genetic factors help determine whether an individual will develop the condition.
When associated with IL36RN gene mutations, risk of GPP is typically inherited in an autosomal recessive pattern, which means both copies of the gene in each cell have mutations. The parents of an individual with an autosomal recessive condition each carry one copy of the mutated gene.
When associated with CARD14 gene mutations, GPP risk is inherited in an autosomal dominant pattern, which means one copy of the altered gene in each cell is sufficient to increase the risk of the disorder. In some cases, an affected person inherits the mutation from one parent. Other cases result from new (de novo) mutations in the gene.
People with mutations in either the IL36RN or CARD14 gene inherit an increased risk of GPP, not the condition itself. Not all people with this condition have mutations in one of these genes, and not all people with a mutation in one of these genes will develop the disorder.
Other Names for This Condition
- Acute generalised pustular psoriasis
- Deficiency of the interleukin-36 receptor antagonist
- Generalized pustular psoriasis of von Zumbusch
- Von Zumbusch psoriasis
Additional Information & Resources
Research Studies from ClinicalTrials.gov
Scientific Articles on PubMed
- Hussain S, Berki DM, Choon SE, Burden AD, Allen MH, Arostegui JI, Chaves A, Duckworth M, Irvine AD, Mockenhaupt M, Navarini AA, Seyger MMB, Soler-Palacin P, Prins C, Valeyrie-Allanore L, Vicente MA, Trembath RC, Smith CH, Barker JN, Capon F. IL36RN mutations define a severe autoinflammatory phenotype of generalized pustular psoriasis. J Allergy Clin Immunol. 2015 Apr;135(4):1067-1070.e9. doi: 10.1016/j.jaci.2014.09.043. Epub 2014 Nov 12. Citation on PubMed
- Jordan CT, Cao L, Roberson ED, Duan S, Helms CA, Nair RP, Duffin KC, Stuart PE, Goldgar D, Hayashi G, Olfson EH, Feng BJ, Pullinger CR, Kane JP, Wise CA, Goldbach-Mansky R, Lowes MA, Peddle L, Chandran V, Liao W, Rahman P, Krueger GG, Gladman D, Elder JT, Menter A, Bowcock AM. Rare and common variants in CARD14, encoding an epidermal regulator of NF-kappaB, in psoriasis. Am J Hum Genet. 2012 May 4;90(5):796-808. doi: 10.1016/j.ajhg.2012.03.013. Epub 2012 Apr 19. Citation on PubMed or Free article on PubMed Central
- Körber A, Mössner R, Renner R, Sticht H, Wilsmann-Theis D, Schulz P, Sticherling M, Traupe H, Hüffmeier U. Mutations in IL36RN in patients with generalized pustular psoriasis. J Invest Dermatol. 2013 Nov;133(11):2634-2637. doi: 10.1038/jid.2013.214. Epub 2013 May 6. Citation on PubMed
- Marrakchi S, Guigue P, Renshaw BR, Puel A, Pei XY, Fraitag S, Zribi J, Bal E, Cluzeau C, Chrabieh M, Towne JE, Douangpanya J, Pons C, Mansour S, Serre V, Makni H, Mahfoudh N, Fakhfakh F, Bodemer C, Feingold J, Hadj-Rabia S, Favre M, Genin E, Sahbatou M, Munnich A, Casanova JL, Sims JE, Turki H, Bachelez H, Smahi A. Interleukin-36-receptor antagonist deficiency and generalized pustular psoriasis. N Engl J Med. 2011 Aug 18;365(7):620-8. doi: 10.1056/NEJMoa1013068. Citation on PubMed
- Onoufriadis A, Simpson MA, Pink AE, Di Meglio P, Smith CH, Pullabhatla V, Knight J, Spain SL, Nestle FO, Burden AD, Capon F, Trembath RC, Barker JN. Mutations in IL36RN/IL1F5 are associated with the severe episodic inflammatory skin disease known as generalized pustular psoriasis. Am J Hum Genet. 2011 Sep 9;89(3):432-7. doi: 10.1016/j.ajhg.2011.07.022. Epub 2011 Aug 11. Citation on PubMed or Free article on PubMed Central
- Setta-Kaffetzi N, Simpson MA, Navarini AA, Patel VM, Lu HC, Allen MH, Duckworth M, Bachelez H, Burden AD, Choon SE, Griffiths CE, Kirby B, Kolios A, Seyger MM, Prins C, Smahi A, Trembath RC, Fraternali F, Smith CH, Barker JN, Capon F. AP1S3 mutations are associated with pustular psoriasis and impaired Toll-like receptor 3 trafficking. Am J Hum Genet. 2014 May 1;94(5):790-7. doi: 10.1016/j.ajhg.2014.04.005. Citation on PubMed or Free article on PubMed Central
- Sugiura K, Takemoto A, Yamaguchi M, Takahashi H, Shoda Y, Mitsuma T, Tsuda K, Nishida E, Togawa Y, Nakajima K, Sakakibara A, Kawachi S, Shimizu M, Ito Y, Takeichi T, Kono M, Ogawa Y, Muro Y, Ishida-Yamamoto A, Sano S, Matsue H, Morita A, Mizutani H, Iizuka H, Muto M, Akiyama M. The majority of generalized pustular psoriasis without psoriasis vulgaris is caused by deficiency of interleukin-36 receptor antagonist. J Invest Dermatol. 2013 Nov;133(11):2514-2521. doi: 10.1038/jid.2013.230. Epub 2013 May 22. Citation on PubMed
- Sugiura K. The genetic background of generalized pustular psoriasis: IL36RN mutations and CARD14 gain-of-function variants. J Dermatol Sci. 2014 Jun;74(3):187-92. doi: 10.1016/j.jdermsci.2014.02.006. Epub 2014 Mar 5. Review. Citation on PubMed
- Takeichi T, Kobayashi A, Ogawa E, Okuno Y, Kataoka S, Kono M, Sugiura K, Okuyama R, Akiyama M. Autosomal dominant familial generalized pustular psoriasis caused by a CARD14 mutation. Br J Dermatol. 2017 Oct;177(4):e133-e135. doi: 10.1111/bjd.15442. Epub 2017 Sep 10. Citation on PubMed
- Tauber M, Bal E, Pei XY, Madrange M, Khelil A, Sahel H, Zenati A, Makrelouf M, Boubridaa K, Chiali A, Smahi N, Otsmane F, Bouajar B, Marrakchi S, Turki H, Bourrat E, Viguier M, Hamel Y, Bachelez H, Smahi A. IL36RN Mutations Affect Protein Expression and Function: A Basis for Genotype-Phenotype Correlation in Pustular Diseases. J Invest Dermatol. 2016 Sep;136(9):1811-1819. doi: 10.1016/j.jid.2016.04.038. Epub 2016 May 21. Review. Citation on PubMed
- Wang Y, Cheng R, Lu Z, Guo Y, Yan M, Liang J, Huang P, Li M, Yao Z. Clinical profiles of pediatric patients with GPP alone and with different IL36RN genotypes. J Dermatol Sci. 2017 Mar;85(3):235-240. doi: 10.1016/j.jdermsci.2016.11.008. Epub 2016 Dec 13. Citation on PubMed