Clinical and genetic stratification of childhood psoriasis
Author: Lysell, Josefin
Date: 2015-05-22
Location: Welandersalen, B2:00, Hudkliniken, Karolinska Universitetssjukhuset, Solna
Time: 09.00
Department: Inst för medicin, Solna / Dept of Medicine, Solna
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Thesis (12.21Mb)
Abstract
Psoriasis is a clinically heterogeneous and common disease affecting about 2-3% of the
population in Sweden. Twin and family studies have shown a strong and complex genetic
background in psoriasis. The strongest known linkage association is for HLA-C*06 on
chromosome 6p21.3. During the last decade several genome-wide association studies
(GWAS) have independently replicated strong association with HLA-C*06 and found
numerous other loci at which common single-nucleotide polymorphisms (SNPs) modestly
influence the risk of developing psoriasis. Environmental factors such as infections, stressful
life events and medication also contribute to disease development. Although psoriasis is such
a highly heterogeneous disease most psoriasis susceptibility genes have been identified in
cohorts of mixed clinical phenotypes and exploration of genes in clinical subtypes is scarce.
Age of onset is one factor that can be used for stratification. Onset of psoriasis can occur at any age in life but is most common in young adults and onset in childhood and adolescence is not uncommon. Studies stratifying for age of onset of psoriasis have in principle been limited to comparing onset before or after 40 years of age as defined by Henseler and Christophers in 1985. However, 75% of patients develop disease before 40 years of age, thus stratification for early onset of psoriasis using this definition comprises the majority of patients.
The overall aim of this thesis was to characterize the clinical phenotype and genetic background in psoriasis patients with disease onset in childhood and adolescence. Our hypothesis was that different genetic background could influence age of onset, clinical presentation and prognosis.
Within this PhD project patients with onset of psoriasis in childhood and adolescence have been included for careful clinical and genetic characterization. For stratification for age of onset patients were divided into four groups (0-9, 10-20, 21-40, > 40 years). This approach revealed different genetic variations even within the group of patients with onset before 20 years of age (0-9 vs. 10-20 years at onset) (paper I, II and IV). In paper II genetic association with IL22 in early onset psoriasis was linked to functional alterations in IL-22 responses in Tcells. In paper III we describe clinical phenotypes at onset (< 12 months after onset) in children < 16 years. Pre-pubertal children more often had genital lesions, especially boys, whereas guttate phenotype and facial lesions associated with HLA-C*06 which was more common in children with onset at puberty. Diagnosing psoriasis in potential children for inclusion was not always easy and eczema was the most common differential diagnosis.
In conclusion the data presented in this thesis stresses the importance of careful phenotypic characterization and stratification for age of onset in genetic studies in psoriasis.
Differences in genetic background could have an impact on the development of comorbidities, treatment response and prognosis. Thus, exploration of the genetic background in stratified materials may help in determining prognostic genotype and tailored biologic treatment for patients in the future.
Age of onset is one factor that can be used for stratification. Onset of psoriasis can occur at any age in life but is most common in young adults and onset in childhood and adolescence is not uncommon. Studies stratifying for age of onset of psoriasis have in principle been limited to comparing onset before or after 40 years of age as defined by Henseler and Christophers in 1985. However, 75% of patients develop disease before 40 years of age, thus stratification for early onset of psoriasis using this definition comprises the majority of patients.
The overall aim of this thesis was to characterize the clinical phenotype and genetic background in psoriasis patients with disease onset in childhood and adolescence. Our hypothesis was that different genetic background could influence age of onset, clinical presentation and prognosis.
Within this PhD project patients with onset of psoriasis in childhood and adolescence have been included for careful clinical and genetic characterization. For stratification for age of onset patients were divided into four groups (0-9, 10-20, 21-40, > 40 years). This approach revealed different genetic variations even within the group of patients with onset before 20 years of age (0-9 vs. 10-20 years at onset) (paper I, II and IV). In paper II genetic association with IL22 in early onset psoriasis was linked to functional alterations in IL-22 responses in Tcells. In paper III we describe clinical phenotypes at onset (< 12 months after onset) in children < 16 years. Pre-pubertal children more often had genital lesions, especially boys, whereas guttate phenotype and facial lesions associated with HLA-C*06 which was more common in children with onset at puberty. Diagnosing psoriasis in potential children for inclusion was not always easy and eczema was the most common differential diagnosis.
In conclusion the data presented in this thesis stresses the importance of careful phenotypic characterization and stratification for age of onset in genetic studies in psoriasis.
Differences in genetic background could have an impact on the development of comorbidities, treatment response and prognosis. Thus, exploration of the genetic background in stratified materials may help in determining prognostic genotype and tailored biologic treatment for patients in the future.
List of papers:
I. Genetic association with ERAP1 in psoriasis is confined to disease onset after puberty and not dependent on HLA-C*06. Josefin Lysell, Leonid Padyukov, Ingrid Kockum, Pernilla Nikamo, Mona Ståhle. Journal of Investigative Dermatology 2013. Feb; 133(2): 411-7
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II. Genetic variants of the IL22 promoter associate to onset of psoriasis before puberty and increased IL-22 production in T cells Pernilla Nikamo, Stanley Cheuk, Josefin Lysell, Charlotta Enerbäck, Kerstin Bergh, Ning Xu Landén, Liv Eidsmo, Mona Ståhle. Journal of Investigative Dermatology 2014 Jun; 134(6): 1535-41
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III. Clinical characterization at onset of childhood psoriasis – a cross sectional study in Sweden. Lysell, Mesfin Tessma, Pernilla Nikamo, Carl-Fredrik Wahlgren, Mona Ståhle. Acta Dermato-Venereologica Acta Derm Venereol 2015. 95: 457–461
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IV. Human leukocyte antigens in psoriasis patients stratified for age of disease onset. Josefin Lysell, Henrik Källberg, Leonid Padyukov, Mona Ståhle, Pernilla Nikamo. [Manuscript]
I. Genetic association with ERAP1 in psoriasis is confined to disease onset after puberty and not dependent on HLA-C*06. Josefin Lysell, Leonid Padyukov, Ingrid Kockum, Pernilla Nikamo, Mona Ståhle. Journal of Investigative Dermatology 2013. Feb; 133(2): 411-7
Fulltext (DOI)
Pubmed
View record in Web of Science®
II. Genetic variants of the IL22 promoter associate to onset of psoriasis before puberty and increased IL-22 production in T cells Pernilla Nikamo, Stanley Cheuk, Josefin Lysell, Charlotta Enerbäck, Kerstin Bergh, Ning Xu Landén, Liv Eidsmo, Mona Ståhle. Journal of Investigative Dermatology 2014 Jun; 134(6): 1535-41
Fulltext (DOI)
Pubmed
View record in Web of Science®
III. Clinical characterization at onset of childhood psoriasis – a cross sectional study in Sweden. Lysell, Mesfin Tessma, Pernilla Nikamo, Carl-Fredrik Wahlgren, Mona Ståhle. Acta Dermato-Venereologica Acta Derm Venereol 2015. 95: 457–461
Fulltext (DOI)
Pubmed
IV. Human leukocyte antigens in psoriasis patients stratified for age of disease onset. Josefin Lysell, Henrik Källberg, Leonid Padyukov, Mona Ståhle, Pernilla Nikamo. [Manuscript]
Institution: Karolinska Institutet
Supervisor: Ståhle, Mona
Issue date: 2015-04-29
Rights:
Publication year: 2015
ISBN: 978-91-7549-950-5
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