Genetics & Epigenetics

Monocyte Epigenetic Aging Tracked Non-Somatic Depression in Women With and Without HIV

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Monocyte Epigenetic Aging Tracked Non-Somatic Depression in Women With and Without HIV

TL;DR: A 2026 study in The Journals of Gerontology, Series A: Biological Sciences and Medical Sciences measured a monocyte-specific DNA methylation clock (MonoDNAmAge) in 440 women with and without HIV, and found that accelerated monocyte epigenetic aging was specifically linked to non-somatic depressive symptoms (anhedonia, hopelessness, cognitive impacts) but not to broader depression severity, supporting …

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Connectome-seq Maps Brain Wiring With RNA Barcodes at Single-Synapse Resolution

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Connectome-seq Turned Synapses Into Barcodes

Connectome-seq Turned Synapses Into Barcodes TL;DR: Connectome-seq is a 2026 Nature Methods platform that maps brain wiring by combining engineered synaptic proteins, RNA barcodes, single-nucleus sequencing, and single-synaptosome sequencing. In a mouse pontocerebellar circuit, the method linked synaptic connections to the molecular identities of connected neurons, turning a wiring map into something sequencing can read. …

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C9orf72 Myeloid Cells Restrained Microbial Inflammation

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C9orf72 Myeloid Cells Restrained Microbial Inflammation

C9orf72 Myeloid Cells Restrained Microbial Inflammation TL;DR: A gut-microbe signal called bacterial glycogen triggered damaging inflammation when C9orf72-deficient immune cells could not restrain it, linking an ALS/FTD gene to gut-brain immune control. Key Findings Ten bacterial strains triggered C9orf72-dependent cytokine release: The inflammatory response depended on how myeloid immune cells handled microbial signals. Bacterial glycogen …

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Mutant Huntingtin Suppressed CSE and Depleted Cysteine in Huntington Disease

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CSE Loss Exposed a Huntington Neurodegeneration Route

TL;DR: Huntington disease may exploit a metabolic weak point: mutant huntingtin suppresses CSE, depleting cysteine biology in vulnerable striatal tissue, while cysteine rescue reversed abnormalities in models. Key Findings CSE was depleted: The Nature abstract reports major depletion of CSE, the cysteine-biosynthetic enzyme, in Huntington disease tissues. Transcriptional defect implicated: The defect appeared to occur …

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Depression Genetics Identified Altered DLPFC Neurons and Microglia

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Depression Genetics Points to Altered DLPFC Cell Types

Depression Genetics Points to Altered DLPFC Cell Types TL;DR: A Nature Genetics study mapped more than 200,000 cells from the dorsolateral prefrontal cortex and found depression-linked regulatory changes concentrated in deep-layer excitatory neurons and a microglia subtype. Key Findings 84 postmortem DLPFC donors: The analysis compared dorsolateral prefrontal cortex tissue from people with major depression …

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Cell-Type Gene Networks Reveal Hidden Causes of Alzheimer’s

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Cell-Type Gene Networks Reveal Hidden Causes of Alzheimer’s TL;DR: Researchers mapped how genes are regulated differently across six brain cell types in Alzheimer’s disease, discovering that excitatory neurons drive the most extensive regulatory disruptions—and identifying key hub genes like RPS27A that could become therapeutic targets. Alzheimer’s disease is a disease of broken communication. The brain …

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How Nitric Oxide Damages TSC2 to Drive Autism Behaviors via mTOR

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Nitric Oxide’s Hidden Link to Autism Behavior TL;DR: A chemical messenger called nitric oxide triggers protein damage that sends the mTOR pathway into overdrive in autism-related mouse models, driving social deficits and repetitive behaviors—and blocking this mechanism reverses both the molecular dysfunction and autistic-like behaviors. Autism spectrum disorder involves dozens of genetic variants, yet many …

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TDP43 Failure Disrupts DNA Repair in ALS and FTD

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The Broken Repair Crew: How TDP43 Sabotages Genome Stability TL;DR: TDP43, the protein that misfires in ALS and FTD, secretly controls DNA repair genes—and when it breaks, mutations pile up in neurons, potentially explaining both neurodegeneration and the cancer link in these diseases. A protein known for its role in neurodegenerative disease has a hidden …

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New Blood Test Detects Alzheimer’s Disease with 83% Accuracy Years Before Symptoms

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Blood Test Detects Alzheimer’s with 83% Accuracy TL;DR: A new blood test using three misfolded plasma proteins can identify Alzheimer’s disease with 83.44% accuracy, outperforming conventional biomarkers and offering a non-invasive screening tool years before cognitive symptoms appear. The holy grail of Alzheimer’s research isn’t a cure—yet. It’s catching the disease before memory starts to …

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Scientists Discover How a Brainless Animal Built a Sensory Proto-Brain

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How a Jellyfish’s Brain Maps the Evolution of Neural Complexity TL;DR: Scientists mapped a ctenophore’s sensory integration center in stunning 3D detail, revealing 17 distinct cell types and a blueprint for how nervous systems first evolved to process multiple senses at once. The ctenophore (pronounced “tee-noh-for”), or comb jelly, is a see-through marine animal barely …

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