Acta Neuropathologica

, Volume 122, Issue 6, pp 673–690 | Cite as

Clinical and neuropathologic heterogeneity of c9FTD/ALS associated with hexanucleotide repeat expansion in C9ORF72

  • Melissa E. Murray
  • Mariely DeJesus-Hernandez
  • Nicola J. Rutherford
  • Matt Baker
  • Ranjan Duara
  • Neill R. Graff-Radford
  • Zbigniew K. Wszolek
  • Tanis J. Ferman
  • Keith A. Josephs
  • Kevin B. Boylan
  • Rosa Rademakers
  • Dennis W. Dickson
Original Paper

Abstract

Frontotemporal dementia (FTD) and amyotrophic lateral sclerosis (ALS) are part of a disease spectrum associated with TDP-43 pathology. Strong evidence supporting this is the existence of kindreds with family members affected by FTD, ALS or mixed features of FTD and ALS, referred to as FTD-MND. Some of these families have linkage to chromosome 9, with hexanucleotide expansion mutation in a noncoding region of C9ORF72. Discovery of the mutation defines c9FTD/ALS. Prior to discovery of mutations in C9ORF72, it was assumed that TDP-43 pathology in c9FTD/ALS was uniform. In this study, we examined the neuropathology and clinical features of 20 cases of c9FTD/ALS from a brain bank for neurodegenerative disorders. Included are six patients clinically diagnosed with ALS, eight FTD, one FTD-MND and four Alzheimer-type dementia. Clinical information was unavailable for one patient. Pathologically, the cases all had TDP-43 pathology, but there were three major pathologic groups: ALS, FTLD-MND and FTLD-TDP. The ALS cases were morphologically similar to typical sporadic ALS with almost no extramotor TDP-43 pathology; all had oligodendroglial cytoplasmic inclusions. The FTLD-MND showed predominantly Mackenzie Type 3 TDP-43 pathology, and all had ALS-like pathology in motor neurons, but more extensive extramotor pathology, with oligodendroglial cytoplasmic inclusions and infrequent hippocampal sclerosis. The FTLD-TDP cases had several features similar to FTLD-TDP due to mutations in the gene for progranulin, including Mackenzie Type 1 TDP-43 pathology with neuronal intranuclear inclusions and hippocampal sclerosis. FTLD-TDP patients were older and some were thought to have Alzheimer-type dementia. In addition to the FTD and ALS clinical presentations, the present study shows that c9FTD/ALS can have other presentations, possibly related to age of onset and the presence of hippocampal sclerosis. Moreover, there is pathologic heterogeneity not only between ALS and FTLD, but also within the FTLD group. Further studies are needed to address the molecular mechanism of clinical and pathological heterogeneity of c9FTD/ALS due to mutations in C9ORF72.

Notes

Acknowledgments

We are grateful to all patients, family members, and caregivers who agreed to brain donation, without which these studies would have been impossible. We also acknowledge expert technical assistance of Monica Casey-Castanedes for immunohistochemistry, Linda Rousseau and Virginia Phillips for histology and John Gonzalez, Beth Marten, Pamela Desaro and Amelia Johnston for brain banking. This research was funded by Mayo Foundation (Jacoby Professorship of Alzheimer Research, Research Committee CR Program; ALS Center donor funds); National Institutes of Health (P50-AG16574, P50-NS72187, P01-AG03949, P01-AG17216, R01-AG37491, R01-AG15866, R01-NS65782 and R01-AG26251), the ALS Association; CurePSP/The Society for Progressive Supranuclear Palsy; and the State of Florida Alzheimer Disease Initiative.

Supplementary material

401_2011_907_MOESM1_ESM.doc (83 kb)
Supplementary material 1 (DOC 83 kb)

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Melissa E. Murray
    • 1
  • Mariely DeJesus-Hernandez
    • 1
  • Nicola J. Rutherford
    • 1
  • Matt Baker
    • 1
  • Ranjan Duara
    • 3
  • Neill R. Graff-Radford
    • 2
  • Zbigniew K. Wszolek
    • 2
  • Tanis J. Ferman
    • 4
  • Keith A. Josephs
    • 5
  • Kevin B. Boylan
    • 2
  • Rosa Rademakers
    • 1
  • Dennis W. Dickson
    • 1
  1. 1.Department of NeuroscienceMayo ClinicJacksonvilleUSA
  2. 2.Department of NeurologyMayo ClinicJacksonvilleUSA
  3. 3.Wien Center for Alzheimer’s Disease and Memory DisordersMount Sinai Medical CenterMiami BeachUSA
  4. 4.Department of PsychologyMayo ClinicJacksonvilleUSA
  5. 5.Department of NeurologyMayo ClinicRochesterUSA

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