The shortest known prion protein gene allele occurs in goats, has only three octapeptide repeats and is non-pathogenic.

Abstract excerpt

The prion protein (PrP) gene modulates the incidence and incubation periods of transmissible spongiform encephalopathies of sheep, goats, mice and man. Here, a new caprine PrP allele encoding the shortest naturally occurring PrP protein so far described is reported. This variant contains only three instead of the usual five copies of a short peptide repeat [Pro-Gln/His-Gly-Gly-Gly-(Gly)-TrpGly-Gln] characteristic...

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