A susceptibility gene for psoriatic arthritis maps to chromosome 16q: evidence for imprinting
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Gudjonsson, Johann E
Antonsdottir, Arna A
Hauksson, Valdimar B
Runasdottir, E Hjaltey
Jonsson, Hjortur H
Gudbjartsson, Daniel F
Frigge, Michael L
Gulcher, Jeffrey R
MetadataShow full item record
CitationAm. J. Hum. Genet. 2003, 72(1):125-31
AbstractSeveral genetic loci have been reported for psoriasis, but none has been specifically linked to psoriatic arthritis (PsA), a condition that affects >10% of patients with psoriasis. A genetic component for PsA is suggested by segregation within families and high concordance among identical twins. We performed a linkage scan to map genes contributing to PsA. We identified 178 patients with PsA out of 906 patients who were included in our genetic study of psoriasis. Using a comprehensive genealogy database, we were able to connect 100 of these into 39 families. We genotyped the patients using a framework marker set of 1,000 microsatellite markers, with an average density of 3 cM, and performed multipoint, affected-only, allele-sharing linkage analysis using the Allegro program. On the basis of the initial results, we genotyped more markers for the most prominent loci. A linkage with a LOD score of 2.17 was observed on chromosome 16q. The linkage analysis, conditioned on paternal transmission to affected individuals, gave a LOD score of 4.19, whereas a LOD score of only 1.03 was observed when conditioned for maternal transmission. A suggestive locus on chromosome 16q has previously been implicated in psoriasis. Our data indicate that a gene at this locus may be involved in paternal transmission of PsA.
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