Alzheimer’s Field Loses Fred van Leeuwen, 71
Van Leeuwen was best known for finding frameshift mutations in APP and ubiquitin B in the brains of people with tauopathies.
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Massive GWAS Meta-Analysis Digs Up Trove of Alzheimer’s Genes
Researchers unearthed 75 risk loci, 42 of them new, and nominated candidate genes for each. A polygenic risk score based on all variants predicted AD risk with high accuracy.
TWAS x GWAS? Transcriptome Analysis Finds 11 Parkinson’s Genes
Transcriptomic and epigenomic data pin PD risk genes in GWAS loci; six affect splicing, five expression, four are new.
Earliest of Them All: Blood P-Tau231 Assay Flags Pre-Amyloid Alzheimer’s
The first ultrasensitive plasma test for this old marker differentiates Alzheimer’s from healthy controls and non-AD dementias. It segregates people stepwise at phases of pathogenesis down to Braak stages 1 and 2 and below amyloid PET positivity.
In Triculture Model, Astrocyte-Microglia Cross Talk Spurs Inflammation
When cultured with human neurons expressing a familial Alzheimer’s gene, both microglia and astrocytes were necessary to spike complement C3 and send inflammation into overdrive.
Not Merely Tau Tombstones, Neurofibrillary Tangles Are Dynamic
In mouse brain slices at least, tau shuffles in and out of protein inclusions. The tangles grew more inert as the tissue aged.
New Smartwatch Utility Tracks Parkinson’s Symptoms
Sensor algorithms can accurately capture patterns of resting tremor and dyskinesia. This could help clinicians manage symptoms and medication.
Make Proteins, Save Memory: The Cellular Stress Response and Synapses
In mouse models of Aβ toxicity and amyloidosis, inhibiting the integrated stress response restored protein production, spared synapses, and brought back memory.
Inactivity May Be a Symptom, Not a Cause, of Dementia
People who report not participating in social or cognitive activities are more likely to develop dementia within the next few years, but not after that. The findings cast nonparticipation as a consequence, not a cause, of neurodegeneration.
Striking Microgliosis in New APP Knock-in Mice
Plaques abound, cytokines spike, microglia swell with lipids and send out spermine SOS signals in Denali model. Mice will be shared, allowing unrestricted use.
Taiwan FDA Approves MagQu Plasma Aβ And Tau Tests
Assays will help doctors diagnose Alzheimer’s disease and amnestic mild cognitive impairment in Taiwanese clinics.
Are the Long Aβ Peptides the Real Bad Guys?
Among 14 familial Alzheimer’s APP mutations, two don’t change the Aβ42/Aβ40 ratio, but all of them yield long peptides of 45 to 49 residues that hide out in the membrane.
Aducanumab Decision Delayed for Three Months
In response to an FDA request, the drug’s sponsor submitted new data analyses. The agency moved the action date to June 7.
PWAS x GWAS? Proteome Analysis Nets 10 New Alzheimer’s Genes
By comparing protein changes with GWAS data, scientists identified new links to AD. This method can unearth genes that otherwise fall short of genome-wide significance.
Sharp Centenarians Shrug Off Effects of Alzheimer’s Pathology
Despite plaques and tangles in the brain, this group, on average, maintains their cognitive skills over two to four years, suggesting the presence of resilience factors.
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