Biomaterial Database

Family studies in psoriasis. I. Complex segregation analysis. 1982

J J Pietrzyk, and G Turowski, and M Kapińska-Mrówka, and B Rózański

The genetic background of psoriasis is unknown and its mode of inheritance is still controversial. Family studies in psoriasis were based on complex segregation analysis and a special computer programme was prepared. The results of the analysis in 244 families strongly suggest multifactorial inheritance of psoriasis vulgaris. Among the nine hypotheses of rank 1 and rank 2, the lowest value of chi-square, 72.847, was for recessive inheritance, but for the multifactorial model it was extremely low (chi-square = 35.980). The estimated heritability was 82%. It might be possible that at least two genetically distinct subpopulations of psoriasis vulgaris exist: one with multifactorial inheritance and a second with multigenic determination, if the disease were due to recessive genes and to one or more dominant factors. The theoretical recurrence risk of psoriasis for the multifactorial model was computed for families with normal parents and for families with one affected parent.

UI	MeSH Term	Description	Entries
D008297	Male		Males
D008957	Models, Genetic	Theoretical representations that simulate the behavior or activity of genetic processes or phenomena. They include the use of mathematical equations, computers, and other electronic equipment.	Genetic Models,Genetic Model,Model, Genetic
D011336	Probability	The study of chance processes or the relative frequency characterizing a chance process.	Probabilities
D011565	Psoriasis	A common genetically determined, chronic, inflammatory skin disease characterized by rounded erythematous, dry, scaling patches. The lesions have a predilection for nails, scalp, genitalia, extensor surfaces, and the lumbosacral region. Accelerated epidermopoiesis is considered to be the fundamental pathologic feature in psoriasis.	Palmoplantaris Pustulosis,Pustular Psoriasis of Palms and Soles,Pustulosis Palmaris et Plantaris,Pustulosis of Palms and Soles,Psoriases
D005260	Female		Females
D005799	Genes, Dominant	Genes that influence the PHENOTYPE both in the homozygous and the heterozygous state.	Conditions, Dominant Genetic,Dominant Genetic Conditions,Genetic Conditions, Dominant,Condition, Dominant Genetic,Dominant Gene,Dominant Genes,Dominant Genetic Condition,Gene, Dominant,Genetic Condition, Dominant
D005808	Genes, Recessive	Genes that influence the PHENOTYPE only in the homozygous state.	Conditions, Recessive Genetic,Genetic Conditions, Recessive,Recessive Genetic Conditions,Condition, Recessive Genetic,Gene, Recessive,Genetic Condition, Recessive,Recessive Gene,Recessive Genes,Recessive Genetic Condition
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000483	Alleles	Variant forms of the same gene, occupying the same locus on homologous CHROMOSOMES, and governing the variants in production of the same gene product.	Allelomorphs,Allele,Allelomorph
D012306	Risk	The probability that an event will occur. It encompasses a variety of measures of the probability of a generally unfavorable outcome.	Relative Risk,Relative Risks,Risk, Relative,Risks,Risks, Relative