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Background  Human prion diseases are relentlessly progressive neurodegenerative disorders which include sporadic Creutzfeldt-Jakob disease (sCJD) and variant CJD (vCJD). Aside from variants of the prion protein gene ( PRNP ) replicated association at genome-wide levels of significance has proven elusive. A recent association study identified variants in or near to the  PLCXD3  gene locus as strong disease risk factors in multiple human prion diseases. This study claimed the first non- PRNP  locus to be highly significantly associated with prion disease in genomic studies.    Methods  A sub-study of a genome-wide association study with imputation aiming to replicate the finding at  PLCXD3  including 129 vCJD and 2500 sCJD samples. Whole exome sequencing to identify rare coding variants of  PLCXD3 .    Results  Imputation of relevant polymorphisms was accurate based on wet genotyping of a sample. We found no supportive evidence that  PLCXD3  variants are associated with disease.    Conclusion  The marked discordance in vCJD genotype frequencies between studies, despite extensive overlap in vCJD cases, and the finding of Hardy-Weinberg disequilibrium in the original study, suggests possible reasons for the discrepancies between studies.

Variants of PLCXD3 are not associated with variant or sporadic Creutzfeldt-Jakob disease in a large international study