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Prion disease with octapeptide repeat insertion.

C Vital1, F Gray, A Vital

  • 1Laboratoire de Neuropathologie, Université Victor Segalen, Bordeaux.

Clinical and Experimental Pathology
|September 3, 1999
PubMed
Summary
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Octapeptide repeat insertions (OPRI) in the prion protein gene cause familial prion disease. Neuropathological findings vary with OPRI number, with elongated deposits seen in 4-7 repeats and plaques in 8-9 repeats.

Area of Science:

  • Neuroscience
  • Genetics
  • Pathology

Background:

  • Familial prion diseases account for approximately 8% of all cases.
  • A subset of these is caused by octapeptide repeat insertions (OPRI) in the prion protein gene.
  • The number of OPRI can range from 4 to 9 multiples of 24 base-pair.

Purpose of the Study:

  • To investigate the neuropathological characteristics associated with varying numbers of octapeptide repeat insertions (OPRI) in the prion protein gene.
  • To compare routine histopathology and immunohistochemistry with molecular genetic findings in these cases.

Main Methods:

  • Neuropathological examination of 23 cases (20 from 9 families, 3 isolated).
  • Histopathological preparations and immunohistochemistry using prion protein antibodies.

Related Experiment Videos

  • Comparison with molecular genetic investigation to determine OPRI number.

    • Main Results:

    • Cases with 4-7 OPRI showed elongated prion protein deposits in the cerebellar molecular layer, detectable only with immunohistochemistry.
    • Cases with 8-9 OPRI presented with typical plaques, visible even on routine histopathological preparations.
    • A correlation was observed between the number of OPRI and the specific neuropathological findings.

    Conclusions:

    • The neuropathological presentation in the cerebellar molecular layer varies significantly with the number of octapeptide repeat insertions (OPRI).
    • Elongated deposits are a characteristic finding in cases with 4-7 OPRI.
    • These distinct findings highlight the importance of correlating genetic findings with detailed neuropathological examination.