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1.  Frontotemporal dementia and its subtypes: a genome-wide association study 
Ferrari, Raffaele | Hernandez, Dena G | Nalls, Michael A | Rohrer, Jonathan D | Ramasamy, Adaikalavan | Kwok, John B J | Dobson-Stone, Carol | Brooks, William S | Schofield, Peter R | Halliday, Glenda M | Hodges, John R | Piguet, Olivier | Bartley, Lauren | Thompson, Elizabeth | Haan, Eric | Hernández, Isabel | Ruiz, Agustín | Boada, Mercè | Borroni, Barbara | Padovani, Alessandro | Cruchaga, Carlos | Cairns, Nigel J | Benussi, Luisa | Binetti, Giuliano | Ghidoni, Roberta | Forloni, Gianluigi | Galimberti, Daniela | Fenoglio, Chiara | Serpente, Maria | Scarpini, Elio | Clarimón, Jordi | Lleó, Alberto | Blesa, Rafael | Waldö, Maria Landqvist | Nilsson, Karin | Nilsson, Christer | Mackenzie, Ian R A | Hsiung, Ging-Yuek R | Mann, David M A | Grafman, Jordan | Morris, Christopher M | Attems, Johannes | Griffiths, Timothy D | McKeith, Ian G | Thomas, Alan J | Pietrini, P | Huey, Edward D | Wassermann, Eric M | Baborie, Atik | Jaros, Evelyn | Tierney, Michael C | Pastor, Pau | Razquin, Cristina | Ortega-Cubero, Sara | Alonso, Elena | Perneczky, Robert | Diehl-Schmid, Janine | Alexopoulos, Panagiotis | Kurz, Alexander | Rainero, Innocenzo | Rubino, Elisa | Pinessi, Lorenzo | Rogaeva, Ekaterina | George-Hyslop, Peter St | Rossi, Giacomina | Tagliavini, Fabrizio | Giaccone, Giorgio | Rowe, James B | Schlachetzki, J C M | Uphill, James | Collinge, John | Mead, S | Danek, Adrian | Van Deerlin, Vivianna M | Grossman, Murray | Trojanowsk, John Q | van der Zee, Julie | Deschamps, William | Van Langenhove, Tim | Cruts, Marc | Van Broeckhoven, Christine | Cappa, Stefano F | Le Ber, Isabelle | Hannequin, Didier | Golfier, Véronique | Vercelletto, Martine | Brice, Alexis | Nacmias, Benedetta | Sorbi, Sandro | Bagnoli, Silvia | Piaceri, Irene | Nielsen, Jørgen E | Hjermind, Lena E | Riemenschneider, Matthias | Mayhaus, Manuel | Ibach, Bernd | Gasparoni, Gilles | Pichler, Sabrina | Gu, Wei | Rossor, Martin N | Fox, Nick C | Warren, Jason D | Spillantini, Maria Grazia | Morris, Huw R | Rizzu, Patrizia | Heutink, Peter | Snowden, Julie S | Rollinson, Sara | Richardson, Anna | Gerhard, Alexander | Bruni, Amalia C | Maletta, Raffaele | Frangipane, Francesca | Cupidi, Chiara | Bernardi, Livia | Anfossi, Maria | Gallo, Maura | Conidi, Maria Elena | Smirne, Nicoletta | Rademakers, Rosa | Baker, Matt | Dickson, Dennis W | Graff-Radford, Neill R | Petersen, Ronald C | Knopman, David | Josephs, Keith A | Boeve, Bradley F | Parisi, Joseph E | Seeley, William W | Miller, Bruce L | Karydas, Anna M | Rosen, Howard | van Swieten, John C | Dopper, Elise G P | Seelaar, Harro | Pijnenburg, Yolande AL | Scheltens, Philip | Logroscino, Giancarlo | Capozzo, Rosa | Novelli, Valeria | Puca, Annibale A | Franceschi, M | Postiglione, Alfredo | Milan, Graziella | Sorrentino, Paolo | Kristiansen, Mark | Chiang, Huei-Hsin | Graff, Caroline | Pasquier, Florence | Rollin, Adeline | Deramecourt, Vincent | Lebert, Florence | Kapogiannis, Dimitrios | Ferrucci, Luigi | Pickering-Brown, Stuart | Singleton, Andrew B | Hardy, John | Momeni, Parastoo
Lancet neurology  2014;13(7):686-699.
Summary
Background
Frontotemporal dementia (FTD) is a complex disorder characterised by a broad range of clinical manifestations, differential pathological signatures, and genetic variability. Mutations in three genes—MAPT, GRN, and C9orf72—have been associated with FTD. We sought to identify novel genetic risk loci associated with the disorder.
Methods
We did a two-stage genome-wide association study on clinical FTD, analysing samples from 3526 patients with FTD and 9402 healthy controls. All participants had European ancestry. In the discovery phase (samples from 2154 patients with FTD and 4308 controls), we did separate association analyses for each FTD subtype (behavioural variant FTD, semantic dementia, progressive non-fluent aphasia, and FTD overlapping with motor neuron disease [FTD-MND]), followed by a meta-analysis of the entire dataset. We carried forward replication of the novel suggestive loci in an independent sample series (samples from 1372 patients and 5094 controls) and then did joint phase and brain expression and methylation quantitative trait loci analyses for the associated (p<5 × 10−8) and suggestive single-nucleotide polymorphisms.
Findings
We identified novel associations exceeding the genome-wide significance threshold (p<5 × 10−8) that encompassed the HLA locus at 6p21.3 in the entire cohort. We also identified a potential novel locus at 11q14, encompassing RAB38/CTSC, for the behavioural FTD subtype. Analysis of expression and methylation quantitative trait loci data suggested that these loci might affect expression and methylation incis.
Interpretation
Our findings suggest that immune system processes (link to 6p21.3) and possibly lysosomal and autophagy pathways (link to 11q14) are potentially involved in FTD. Our findings need to be replicated to better define the association of the newly identified loci with disease and possibly to shed light on the pathomechanisms contributing to FTD.
Funding
The National Institute of Neurological Disorders and Stroke and National Institute on Aging, the Wellcome/ MRC Centre on Parkinson’s disease, Alzheimer’s Research UK, and Texas Tech University Health Sciences Center.
doi:10.1016/S1474-4422(14)70065-1
PMCID: PMC4112126  PMID: 24943344
2.  Association of hypometabolism and amyloid levels in aging, normal subjects 
Neurology  2014;82(22):1959-1967.
Objective:
We evaluated the relationship of amyloid, seen on Pittsburgh compound B (PiB)-PET, and metabolism, seen on [18F]-fluorodeoxyglucose (FDG)-PET, in normal subjects to better understand pathogenesis and biomarker selection in presymptomatic subjects.
Methods:
Normal participants (aged 70–95 years; 600 with PiB-PET, FDG-PET, and MRI) were included. We performed a cross-sectional evaluation and subcategorized participants into amyloid-negative (<1.4), high-normal (1.4–1.5), positive (1.5–2.0), and markedly positive (>2.0) PiB standardized uptake value ratio groups representing different levels of amyloid brain load. Associations with metabolism were assessed in each group. Relationships with APOE ε4 carriage were evaluated.
Results:
Hypometabolism in “Alzheimer disease (AD)-signature” regions was strongly associated with PiB load. Hypometabolism was greater with more positive PiB levels. Additional, more-diffuse cortical hypometabolism was also found to be associated with PiB, although less so. No hypermetabolism was seen in any subset. No significant incremental hypometabolism was seen in APOE-positive vs -negative subjects.
Conclusions:
Hypometabolism in PiB-positive, cognitively normal subjects in a population-based cohort occurs in AD-signature cortical regions and to a lesser extent in other cortical regions. It is more pronounced with higher amyloid load and supports a dose-dependent association. The effect of APOE ε4 carriage in this group of subjects does not appear to modify their hypometabolic “AD-like” neurodegeneration. Consideration of hypometabolism associated with amyloid load may aid trials of AD drug therapy.
doi:10.1212/WNL.0000000000000467
PMCID: PMC4105262  PMID: 24793183
3.  Expanded GGGGCC hexanucleotide repeat in non-coding region of C9ORF72 causes chromosome 9p-linked frontotemporal dementia and amyotrophic lateral sclerosis 
Neuron  2011;72(2):245-256.
SUMMARY
Several families have been reported with autosomal dominant frontotemporal dementia (FTD) and amyotrophic lateral sclerosis (ALS), genetically linked to chromosome 9p21. Here we report an expansion of a non-coding GGGGCC hexanucleotide repeat in the gene C9ORF72 that is strongly associated with disease in a large FTD/ALS kindred, previously reported to be conclusively linked to chromosome 9p. This same repeat expansion was identified in the majority of our families with a combined FTD/ALS phenotype and TDP-43 based pathology. Analysis of extended clinical series found the C9ORF72 repeat expansion to be the most common genetic abnormality in both familial FTD (11.7%) and familial ALS (22.5%). The repeat expansion leads to the loss of one alternatively spliced C9ORF72 transcript and to formation of nuclear RNA foci, suggesting multiple disease mechanisms. Our findings indicate that repeat expansion in C9ORF72 is a major cause of both FTD and ALS.
doi:10.1016/j.neuron.2011.09.011
PMCID: PMC3202986  PMID: 21944778
4.  Sensitivity of revised diagnostic criteria for the behavioural variant of frontotemporal dementia 
Brain  2011;134(9):2456-2477.
Based on the recent literature and collective experience, an international consortium developed revised guidelines for the diagnosis of behavioural variant frontotemporal dementia. The validation process retrospectively reviewed clinical records and compared the sensitivity of proposed and earlier criteria in a multi-site sample of patients with pathologically verified frontotemporal lobar degeneration. According to the revised criteria, ‘possible’ behavioural variant frontotemporal dementia requires three of six clinically discriminating features (disinhibition, apathy/inertia, loss of sympathy/empathy, perseverative/compulsive behaviours, hyperorality and dysexecutive neuropsychological profile). ‘Probable’ behavioural variant frontotemporal dementia adds functional disability and characteristic neuroimaging, while behavioural variant frontotemporal dementia ‘with definite frontotemporal lobar degeneration’ requires histopathological confirmation or a pathogenic mutation. Sixteen brain banks contributed cases meeting histopathological criteria for frontotemporal lobar degeneration and a clinical diagnosis of behavioural variant frontotemporal dementia, Alzheimer’s disease, dementia with Lewy bodies or vascular dementia at presentation. Cases with predominant primary progressive aphasia or extra-pyramidal syndromes were excluded. In these autopsy-confirmed cases, an experienced neurologist or psychiatrist ascertained clinical features necessary for making a diagnosis according to previous and proposed criteria at presentation. Of 137 cases where features were available for both proposed and previously established criteria, 118 (86%) met ‘possible’ criteria, and 104 (76%) met criteria for ‘probable’ behavioural variant frontotemporal dementia. In contrast, 72 cases (53%) met previously established criteria for the syndrome (P < 0.001 for comparison with ‘possible’ and ‘probable’ criteria). Patients who failed to meet revised criteria were significantly older and most had atypical presentations with marked memory impairment. In conclusion, the revised criteria for behavioural variant frontotemporal dementia improve diagnostic accuracy compared with previously established criteria in a sample with known frontotemporal lobar degeneration. Greater sensitivity of the proposed criteria may reflect the optimized diagnostic features, less restrictive exclusion features and a flexible structure that accommodates different initial clinical presentations. Future studies will be needed to establish the reliability and specificity of these revised diagnostic guidelines.
doi:10.1093/brain/awr179
PMCID: PMC3170532  PMID: 21810890
behavioural variant frontotemporal dementia; diagnostic criteria; frontotemporal lobar degeneration; FTD; pathology
5.  Mild cognitive impairment associated with limbic and neocortical lewy body disease: a clinicopathological study 
Brain  2009;133(2):540-556.
There are little data on the relationship between Lewy body disease and mild cognitive impairment syndromes. The Mayo Clinic aging and dementia databases in Rochester, Minnesota, and Jacksonville, Florida were queried for cases who were diagnosed with mild cognitive impairment between 1 January 1996 and 30 April 2008, were prospectively followed and were subsequently found to have autopsy-proven Lewy body disease. The presence of rapid eye movement sleep behaviour disorder was specifically assessed. Mild cognitive impairment subtypes were determined by clinical impression and neuropsychological profiles, based on prospective operational criteria. The diagnosis of clinically probable dementia with Lewy bodies was based on the 2005 McKeith criteria. Hippocampal volumes, rate of hippocampal atrophy, and proton magnetic resonance spectroscopy were assessed on available magnetic resonance imaging and spectroscopy scans. Eight subjects were identified; six were male. Seven developed dementia with Lewy bodies prior to death; one died characterized as mild cognitive impairment. The number of cases and median age of onset (range) for specific features were: seven with rapid eye movement sleep behaviour disorder—60 years (27–91 years), eight with cognitive symptoms—69 years (62–89 years), eight with mild cognitive impairment—70.5 years (66–91 years), eight with parkinsonism symptoms—71 years (66–92 years), six with visual hallucinations—72 years (64–90 years), seven with dementia—75 years (67–92 years), six with fluctuations in cognition and/or arousal—76 years (68–92 years) and eight dead—76 years (71–94 years). Rapid eye movement sleep behaviour disorder preceded cognitive symptom onset in six cases by a median of 10 years (2–47 years) and mild cognitive impairment diagnosis by a median of 12 years (3–48 years). The mild cognitive impairment subtypes represented include: two with single domain non-amnestic mild cognitive impairment, three with multi-domain non-amnestic mild cognitive impairment, and three with multi-domain amnestic mild cognitive impairment. The cognitive domains most frequently affected were attention and executive functioning, and visuospatial functioning. Hippocampal volumes and the rate of hippocampal atrophy were, on average, within the normal range in the three cases who underwent magnetic resonance imaging, and the choline/creatine ratio was elevated in the two cases who underwent proton magnetic resonance spectroscopy when they were diagnosed as mild cognitive impairment. On autopsy, six had neocortical-predominant Lewy body disease and two had limbic-predominant Lewy body disease; only one had coexisting high-likelihood Alzheimer's disease. These findings indicate that among Lewy body disease cases that pass through a mild cognitive impairment stage, any cognitive pattern or mild cognitive subtype is possible, with the attention/executive and visuospatial domains most frequently impaired. Hippocampal volume and proton magnetic resonance spectroscopy data were consistent with recent data in dementia with Lewy bodies. All cases with rapid eye movement sleep behaviour disorder and mild cognitive impairment were eventually shown to have autopsy-proven Lewy body disease, indicating that rapid eye movement sleep behaviour disorder plus mild cognitive impairment probably reflects brainstem and cerebral Lewy body disease.
doi:10.1093/brain/awp280
PMCID: PMC2822633  PMID: 19889717
mild cognitive impairment; dementia; dementia with Lewy bodies; Lewy body disease; neuropathology
6.  Comparison of 18F-FDG and PiB PET in Cognitive Impairment 
The purpose of this study was to compare the diagnostic accuracy of glucose metabolism and amyloid deposition as demonstrated by 18F-FDG and Pittsburg Compound B (PiB) PET to evaluate subjects with cognitive impairment.
Methods
Subjects were selected from existing participants in the Mayo Alzheimer’s Disease Research Center or Alzheimer’s Disease Patient Registry programs. A total of 20 healthy controls and 17 amnestic mild cognitive impairment (aMCI), 6 nonamnestic mild cognitive impairment (naMCI), and 13 Alzheimer disease (AD) subjects were imaged with both PiB and 18F-FDG PET between March 2006 and August 2007. Global measures for PiB and 18F-FDG PET uptake, normalized to cerebellum for PiB and pons for 18F-FDG, were compared. Partial-volume correction, standardized uptake value (SUV), and cortical ratio methods of image analysis were also evaluated in an attempt to optimize the analysis for each test.
Results
Significant discrimination (P < 0.05) between controls and AD, naMCI and aMCI, naMCI and AD, and aMCI and AD by PiB PET measurements was observed. The paired groupwise comparisons of the global measures demonstrated that PiB PET versus 18F-FDG PET showed similar significant group separation, with only PiB showing significant separation of naMCI and aMCI subjects.
Conclusion
PiB PET and 18F-FDG PET have similar diagnostic accuracy in early cognitive impairment. However, significantly better group discrimination in naMCI and aMCI subjects by PiB, compared with 18F-FDG, was seen and may suggest early amyloid deposition before cerebral metabolic disruption in this group.
doi:10.2967/jnumed.108.058529
PMCID: PMC2886669  PMID: 19443597
PET; dementia; 18F-FDG; PiB
7.  Off-Label Medication Use in Frontotemporal Dementia 
Objective
There are no Food and Drug Administration (FDA)-approved medications indicated for the treatment of frontotemporal dementia (FTD). We sought to determine the most commonly used drugs used to treat behavioral variant FTD (bvFTD) in specialized dementia clinics.
Methods
Medication and demographic data from the Alzheimer’s Disease Research Centers of California (ARCC) and a multicenter FTD natural history study (NHS) data set were compared in bvFTD and Alzheimer’s disease (AD), and effects of demographic variables were assessed using logistic regression.
Results
Overall, the percentage of patients taking one or more FDA-approved AD or psychiatric medications was similar in bvFTD and AD; however, after controlling for demographic variables, acetylcholinesterase inhibitor (AChI) use was less common in bvFTD, whereas memantine use remained similar in the 2 groups.
Conclusions
Despite lack of evidence for efficacy, the use of AChIs and memantine is common in bvFTD. Clinical trials should be pursued to determine the optimal therapeutic interventions for bvFTD.
doi:10.1177/1533317509356692
PMCID: PMC2862544  PMID: 20124256
frontotemporal dementia; Alzheimer’s disease; treatment; donepezil; memantine; galantamine; antipsychotic agents

Results 1-7 (7)