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The HL-A system and psoriasis.

J C Woodrow, V K Dave, N Usher

    The British Journal of Dermatology
    |April 1, 1975
    PubMed
    Summary

    Human Leukocyte Antigen (HLA)-17 is strongly associated with psoriasis, particularly in females, and may be a necessary genetic factor for disease development. This finding highlights the role of the HLA system in psoriasis susceptibility.

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    Area of Science:

    • Immunogenetics
    • Dermatology
    • Human Genetics

    Background:

    • Psoriasis is a chronic inflammatory skin condition with a complex etiology.
    • Genetic factors, particularly within the Human Leukocyte Antigen (HLA) system, are implicated in psoriasis pathogenesis.
    • Previous studies have suggested associations between specific HLA antigens and psoriasis, but findings have varied.

    Purpose of the Study:

    • To investigate the association between specific HLA antigens, particularly HLA-17 and HLA-13, and psoriasis in a cohort of patients.
    • To determine if HLA antigen status influences the age of onset and sex distribution of psoriasis.
    • To explore the potential role of HLA inheritance as a prerequisite for psoriasis development.

    Main Methods:

    • A case-control study involving 157 psoriatic patients and a control group.
    • HLA typing was performed to determine the frequency of specific HLA antigens (HLA-17, HLA-13) in patients and controls.
    • Analysis of patient data to correlate HLA status with age of onset and sex.
    • Family studies were conducted to assess the inheritance patterns of HLA antigens in relation to psoriasis.

    Main Results:

    • A significantly higher prevalence of HLA-17 was observed in psoriatic patients (48.4%) compared to controls (6.0%), yielding a relative risk of 14.7.
    • HLA-17 was more frequent in female patients and associated with an earlier age of onset.
    • HLA-13 showed a lower relative risk compared to other centers.
    • Family studies indicated that inheritance of HLA-17 is often a necessary condition for psoriasis onset, with potential involvement of HLA-13 and other predisposing genes.

    Conclusions:

    • HLA-17 is a significant genetic marker for psoriasis susceptibility, particularly in females, and is linked to an earlier disease onset.
    • The findings suggest a complex interplay between HLA-17, HLA-13, and other genetic factors in the development of psoriasis.
    • While a strong association exists, some families show no link between psoriasis and the HLA system, indicating heterogeneity in disease etiology.

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