Dipeptide repeat proteins are present in the p62 positive inclusions in patients with frontotemporal lobar degeneration and motor neurone disease associated with expansions in C9ORF72

David M A Mann, Sara Rollinson, Andrew Robinson, Janis Bennion Callister, Jennifer C. Thompson, Julie S. Snowden, Tania D Gendron, Leonard Petrucelli, Masami Masuda-Suzukake, Masato Hasegawa, Yvonne Davidson, Stuart Pickering-Brown

Research output: Contribution to journalArticle

Abstract

BACKGROUND: Cases of Frontotemporal Lobar Degeneration (FTLD) and Motor Neurone Disease (MND) associated with expansions in C9ORF72 gene are characterised pathologically by the presence of TDP-43 negative, but p62 positive, inclusions in granule cells of the cerebellum and in cells of dentate gyrus and area CA4 of the hippocampus.

RESULTS: We screened 84 cases of pathologically confirmed FTLD and 23 cases of MND for the presence of p62 positive inclusions in these three brain regions, and identified 13 positive cases of FTLD and 3 of MND. All cases demonstrated expansions in C9ORF72 by Southern blotting where frozen tissues were available. The p62 positive inclusions in both cerebellum and hippocampus were immunostained by antibodies to dipeptide repeat proteins (DPR), poly Gly-Ala (poly-GA), poly Gly-Pro (poly-GP) and poly Gly-Arg (poly-GR), these arising from a putative non-ATG initiated (RAN) sense translation of the GGGGCC expansion. There was also some slight, but variable, immunostaining with poly-AP antibody implying some antisense translation might also occur, though the relative paucity of immunostaining could reflect poor antigen avidity on the part of the antisense antibodies. Of the FTLD cases with DPR, 6 showed TDP-43 type A and 6 had TDP-43 type B histology; one had FTLD-tau with the pathology of corticobasal degeneration. There were no qualitative or quantitative differences in the pattern of immunostaining with antibodies to DPR, or p62, proteins between TDP-43 type A and type B cases. Ratings for frequency of inclusions immunostained by these poly-GA, poly-GP and poly-GR antibodies broadly correlated with those for immunolabelled by p62 antibody in all three regions.

CONCLUSION: We conclude that DPR are a major component of p62 positive inclusions in FTLD and MND.

Original languageEnglish (US)
Pages (from-to)68
Number of pages1
JournalActa neuropathologica communications
Volume1
Issue number1
DOIs
StatePublished - 2013
Externally publishedYes

ASJC Scopus subject areas

  • Medicine(all)

Fingerprint Dive into the research topics of 'Dipeptide repeat proteins are present in the p62 positive inclusions in patients with frontotemporal lobar degeneration and motor neurone disease associated with expansions in C9ORF72'. Together they form a unique fingerprint.

  • Cite this

    Mann, D. M. A., Rollinson, S., Robinson, A., Bennion Callister, J., Thompson, J. C., Snowden, J. S., Gendron, T. D., Petrucelli, L., Masuda-Suzukake, M., Hasegawa, M., Davidson, Y., & Pickering-Brown, S. (2013). Dipeptide repeat proteins are present in the p62 positive inclusions in patients with frontotemporal lobar degeneration and motor neurone disease associated with expansions in C9ORF72. Acta neuropathologica communications, 1(1), 68. https://doi.org/10.1186/2051-5960-1-68