Abstract
Presymptomatic studies in ALS have consistently captured considerable disease burden long before symptom manifestation and contributed important academic insights. With the emergence of genotype-specific therapies, however, there is a pressing need to address practical objectives such as the estimation of age of symptom onset, phenotypic prediction, informing the optimal timing of pharmacological intervention, and identifying a core panel of biomarkers which may detect response to therapy. Existing presymptomatic studies in ALS have adopted striking different study designs, relied on a variety of control groups, used divergent imaging and electrophysiology methods, and focused on different genotypes and demographic groups. We have performed a systematic review of existing presymptomatic studies in ALS to identify common themes, stereotyped shortcomings, and key learning points for future studies. Existing presymptomatic studies in ALS often suffer from sample size limitations, lack of disease controls and rarely follow their cohort until symptom manifestation. As the characterisation of presymptomatic processes in ALS serves a multitude of academic and clinical purposes, the careful review of existing studies offers important lessons for future initiatives.
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Abbreviations
- ACE-R:
-
Addenbrooke's Cognitive Examination-Revised
- AD:
-
Alzheimer’s disease
- AD:
-
Axial diffusivity
- ALLFTD:
-
ARTFL–LEFFTDS Longitudinal Frontotemporal Lobar Degeneration
- ALS:
-
Amyotrophic lateral sclerosis
- ALSFRS-R:
-
Amyotrophic Lateral Sclerosis Functional Rating Scale-revised
- ANG:
-
Angiogenin
- APEX1:
-
Apurinic/apyrimidinic endodeoxyribonuclease 1
- APOE4:
-
Apolipoprotein E4
- APP:
-
Amyloid precursor protein
- ASCA:
-
Amnestic Comparative Self-Assessment
- ASO:
-
Antisense oligonucleotide
- AUC:
-
Area under the receiver operator characteristic curve
- AVLT:
-
Auditory verbal learning test
- BADL:
-
Basic activities of daily living
- BDI:
-
Beck Depression Inventory
- BNT:
-
Boston naming test
- bvFTD:
-
Behavioural variant FTD
- CBD:
-
Corticobasal degeneration
- C-CFT:
-
C-Labeled 2-β-carbomethoxy-3-β-(4-fluorophenyl)tropane
- C-CFT:
-
C-Labeled 2-β-carbomethoxy-3-β-(4-fluorophenyl)tropane
- C-PiB:
-
C-Pittsburgh compound B
- C9orf72:
-
Chromosome 9 open reading frame 72
- CAPG:
-
Macrophage-capping protein
- CBF:
-
Cerebral blood flow
- CBI-R:
-
Cambridge Behavioural Inventory revised
- CDR:
-
Clinical Dementia Rating Scale
- CDR-SUM:
-
Clinical Dementia Rating sum of box score
- CHI3L1:
-
Chitinase 3-like protein 1
- CHI3L2:
-
Chitinase 3-like protein 2
- CHIT1:
-
Chitotriosidase-1
- CHMP2B:
-
Charged multivesicular body protein 2b
- CMAP:
-
Compound muscle action potential
- Cr:
-
Creatine
- CRP:
-
C-reactive protein
- CSF:
-
Cerebrospinal fluid
- CST:
-
Corticospinal tract
- CVLT:
-
California Verbal Learning test
- D-KEFS:
-
Delis–Kaplan Executive Function System
- DCTN:
-
Dynactin subunit 1
- DRS:
-
Dementia rating scale
- DTI:
-
Diffusion tensor imaging
- E/I:
-
Excitation/inhibition
- ECAS:
-
Edinburgh Cognitive and Behavioural ALS Screen
- ECLIA:
-
Electrochemiluminescence immunoassay
- ELISA:
-
Enzyme-linked immunosorbent assays
- EMG:
-
Electromyography
- EXAMINER:
-
Executive Abilities: Measures and Instruments for Neurobehavioral Evaluation and Research
- F-FDG:
-
Fluorodeoxyglucose
- FA:
-
Fractional anisotropy
- FAB:
-
Frontal assessment battery
- fALFF:
-
Fractional amplitude of low frequency fluctuation
- FBB:
-
Florbetaben, a fluorine-18
- FBI:
-
Frontal Behavioural Inventory
- FC:
-
Functional connectivity
- fMRI:
-
Functional magnetic resonance imaging
- FTD:
-
Frontotemporal dementia
- FTD-CDR:
-
FTD-specific Clinical Dementia Rating
- FTLD:
-
Frontotemporal lobar degeneration
- FUS:
-
Fused in sarcoma
- FVC:
-
Forced vital capacity
- GENFI:
-
Genetic Frontotemporal dementia Initiative
- GM:
-
Grey matter
- GPNMB:
-
Glycoprotein non-metastatic B
- GRN:
-
Progranulin
- HADS:
-
Hospital Anxiety and Depression Scale
- HD:
-
Huntington’s disease
- HFE:
-
High FE2 +
- HIST1H2B:
-
Histone cluster 1, H2b
- HIST1H4A:
-
Histone cluster 1, H4
- HTT:
-
Huntingtin
- i-TRAQ:
-
Isobaric tags for relative and absolute quantitation
- IADL:
-
Instrumental activities of daily living
- LDST:
-
Letter Digit Substitution Test
- LEFFTDS:
-
Longitudinal Evaluation of Familial Frontotemporal Dementia Subjects
- LMN:
-
Lower motor neuron
- LRRK2:
-
Leucine Rich Repeat Kinase 2
- MAP2:
-
Microtubule-associated protein 2
- MAPT:
-
Microtubule-associated protein tau
- MD:
-
Mean diffusivity
- MDRS:
-
Mattis Dementia rating scale
- MEG:
-
Magnetoencephalography
- MEP:
-
Motor evoked potential
- MMSE:
-
Mini Mental State Examination
- MOCA:
-
Montreal Cognitive Assessment
- MRC:
-
Medical Research Council rating scale
- MRI:
-
Magnetic resonance imaging
- MRM:
-
Multiple reaction monitoring
- MRS:
-
Magnetic resonance spectroscopy
- mtDNA:
-
Mitochondrial DNA
- MUNE:
-
Motor Unit Number Estimation
- MUNIX:
-
Motor Unit Number Index
- MVIC:
-
Maximal voluntary isometric contraction
- Myo:
-
Myo-inosito
- NAA:
-
N-Acetylaspartate
- NEFH:
-
Neurofilament heavy
- NEFL:
-
Neurofilament light
- NEFM:
-
Neurofilament medium;
- NfL:
-
Neurofilament light
- NODDI:
-
Neurite orientation dispersion and density imaging
- NPI-Q:
-
Neuropsychiatric Inventory Questionnaire
- NPTXR:
-
Neuronal pentraxin receptor
- OPTN:
-
Optineurin
- PD:
-
Parkinson’s disease
- PET:
-
Positron emission tomography
- PINK1:
-
PTEN-induced kinase 1
- PLS:
-
Primary lateral sclerosis
- pNfH:
-
Phosphorylated neurofilament heavy chain
- PON:
-
Paraoxonase
- Pre-Fals:
-
Pre-familial amyotrophic lateral sclerosis
- PREV‐DEMALS:
-
Predict to Prevent Frontotemporal Lobar Degeneration and Amyotrophic Lateral Sclerosis Study Group
- PRISMA:
-
Preferred Reporting Items for Systematic Reviews and Meta-Analyses
- PRPH:
-
Peripherin
- PSEN1:
-
Presenilin 1
- PSEN2:
-
Presenilin 2
- RAVLT:
-
Rey Auditory Verbal Learning Test
- RBMT:
-
Rivermead Behavioural Memory test
- rCMA:
-
Rostral cingulate motor area
- RD:
-
Radial diffusivity
- ReHo:
-
Regional Homogeneity
- rs-fMRI:
-
Resting state Fmri
- RWT:
-
Phonematic Regensburger Wortflüssigkeits-test
- SAT:
-
Semantic Association Test
- SDMT:
-
Symbol digit modalities test
- SEA:
-
Social Cognition and Emotional Assessment
- SETX:
-
Senataxin
- SICI:
-
Short interval intracortical inhibition
- SIGMAR1:
-
Sigma non-opioid intracellular receptor 1
- SMA:
-
Spinal muscular atrophy
- SMN:
-
Survival motor neuron
- SNCA:
-
Synuclein alpha
- SOD1:
-
Superoxide dismutase 1
- SOP:
-
Standard operating procedure
- SPG:
-
Spatacsin
- TARDBP:
-
TAR DNA-binding protein, 43
- TBM:
-
Tensor-based morphometry
- TMS:
-
Transcranial magnetic stimulation
- TMT:
-
Trail making test
- UBQLN2:
-
Ubiquilin-2
- UCHL1:
-
Ubiquitin carboxyl-terminal hydrolase 1
- UDSNB:
-
Neuropsychological battery of the Uniform Data Set
- UMN:
-
Upper motor neuron
- UPDRS:
-
Unified Parkinson's Disease Rating Scale
- VAPB:
-
Vesicle-associated membrane protein-associated protein B/C
- VAT:
-
Visual Association Test
- VBM:
-
Voxel-based morphometry
- VCP:
-
Valosin containing protein
- VOSP:
-
The visual object and space perception battery
- WAIS:
-
Wechsler Adult Intelligence Scale
- WCST:
-
Wisconsin Card Sorting Test
- WM:
-
White matter
- WRAT:
-
Wide Range Achievement Test
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Acknowledgements
Peter Bede and the computational neuroimaging group (CNG) are supported by the Spastic Paraplegia Foundation, Inc. (SPF), Health Research Board (HRB EIA-2017-019), the EU Joint ProgrammeNeurodegenerative Disease Research (JPND), the Andrew Lydon scholarship, the Irish Institute of Clinical Neuroscience (IICN), and the Iris O'Brien Foundation. The sponsors of the authors had no bearing on the opinions expressed herein.
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Chipika, R.H., Siah, W.F., McKenna, M.C. et al. The presymptomatic phase of amyotrophic lateral sclerosis: are we merely scratching the surface?. J Neurol 268, 4607–4629 (2021). https://doi.org/10.1007/s00415-020-10289-5
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DOI: https://doi.org/10.1007/s00415-020-10289-5