Paraoxonase (PON1) polymorphisms in farmers attributing ill health to sheep dip

Nicola Cherry, Mike Mackness, Paul Durrington, Andrew Povey, Martin Dippnall, Ted Smith, Bharti Mackness

    Research output: Contribution to journalArticlepeer-review


    Human serum paraoxonase (PON1) hydrolyses diazinonoxon, the active metabolite of diazinon, which is an organophosphate used in sheep dip. In a case-referent study, 175 farmers with ill health that they attributed to sheep dip nominated 234 referent farmers who also dipped sheep and whom they believed to be in good health. We calculated odds ratios for polymorphisms in PON1 at positions 192 and 55, and for PON1 activity with diazinonoxon as substrate. Cases were more likely than referents to have at least one R allele at position 192 (glutamine to arginine aminoacid substitution; odds ratio 1.93, 95% CI 1.24-3.01), both alleles of type LL (1.70, 1.07-2.68) at position 55, and to have diazoxonase activity below normal median (1.77, 1.18-2.67). Our results support the hypothesis that organophosphates contribute to the reported ill health of people who dip sheep.
    Original languageEnglish
    Pages (from-to)763-764
    Number of pages1
    JournalThe Lancet
    Issue number9308
    Publication statusPublished - 2 Mar 2002


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