Three Molecular Autism Subtypes Identified With Distinct Phenotypes via Transcriptomic Analysis

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Three Molecular Autism Subtypes Identified With Distinct Phenotypes via Transcriptomic Analysis

TL;DR: A 2026 Communications Biology transcriptomic analysis identified three molecular subtypes of autism spectrum disorder, each linked to a distinct phenotypic profile and biological pathway pattern. Key Findings Three molecular subtypes emerged from transcriptomic analysis: Researchers identified three distinct molecular subtypes of autism spectrum disorder using transcriptomic data, each with its own gene expression signature. …

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Autism Polygenic Scores Predicted Lower Brain Neurite Density in 36,000 People

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Autism Polygenic Scores Predicted Lower Brain Neurite Density in 36,000 People

TL;DR: A 2025 Molecular Psychiatry study of more than 36,000 people found that higher autism polygenic risk was associated with lower MRI-derived neurite density, a measure of neural-fiber packing, across cortex and white matter in both children and adults. Key Findings Higher autism polygenic score predicted lower neurite density: Across over 36,000 individuals, a robust …

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Adolescent THC Exposure Produced Adult Anxiety and Cognitive Deficits in Male Rats

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Adolescent THC Exposure Produced Adult Anxiety and Cognitive Deficits in Male Rats

TL;DR: A 2026 rat study in Psychopharmacology found that THC exposure during late adolescence left adult animals with elevated anxiety-like behavior and impaired object-recognition and spatial-memory performance after a drug-free recovery period. Key Findings Adolescent THC exposure produced lasting anxiety-like behavior in adulthood: Rats given THC (5 mg/kg/day) from postnatal day 42 to 62 (late …

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Subcallosal Cingulate May Guide Depression Stimulation

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Subcallosal Cingulate May Guide Depression Stimulation

TL;DR: A 2026 systematic review in Translational Psychiatry found that depression brain-stimulation studies repeatedly linked treatment response to subcallosal cingulate connectivity, but inconsistent methods still limit its use as a treatment-selection biomarker. Key Findings 28 studies met criteria: The review included resting-state functional MRI (fMRI), a scan that tracks blood-flow changes as a proxy for …

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Slow Breathing Split Fear Perception by Breath Phase

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Slow Breathing Split Fear Perception by Breath Phase

TL;DR: A 2025 study in European Journal of Neuroscience found that slow breathing sharpened fearful-face perception during inhalation but weakened it during exhalation, with magnetoencephalography showing brain-timing changes before the face appeared. Key Findings 31 adults judged faces while breathing on cue: The main experiment paired normal-paced and slow-paced breathing with a fearful-versus-neutral face discrimination …

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Sleep Growth-Hormone Switch Linked Body and Brain

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Sleep Growth-Hormone Switch Linked Body and Brain

TL;DR: A 2025 mouse study in Cell mapped a sleep-growth hormone circuit, showing how hypothalamic GHRH and somatostatin neurons coordinate hormone pulses and then feed back onto wakefulness. Key Findings GH rose in REM and NREM: Growth hormone release was enhanced during both rapid eye movement and non-REM sleep. Two neuron types controlled release: Hypothalamic …

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Seed Testing May Predict Levodopa Response in Parkinson’s

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Seed Testing May Predict Levodopa Response in Parkinson's

TL;DR: A 2026 medRxiv preprint found that alpha-synuclein seed-positive Parkinson’s patients had slower ON-medication motor progression, measured while usual Parkinson’s medication was active, and more sustained levodopa responsiveness than matched seed-negative patients. Key Findings 223 matched patients: The analysis compared 40 SAA-negative and 183 SAA-positive sporadic Parkinson’s patients from PPMI. ON-state progression diverged while medication …

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Schizophrenia May Reflect Advanced Biological Aging

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Schizophrenia May Reflect Advanced Biological Aging

TL;DR: A 2026 systematic review in The British Journal of Psychiatry linked schizophrenia to a multisystem advanced-aging phenotype, including older-appearing brain scans, shorter telomeres, inflammation, and higher dementia risk. Key Findings 170 studies included: The review synthesized studies of aging markers in schizophrenia and non-affective psychosis published after 2009. Most studies were moderate or high …

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Postpartum Depression Meta-Analysis Linked Brain Activity to Neurotransmitter Maps

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Postpartum Depression Meta-Analysis Linked Brain Activity to Neurotransmitter Maps

TL;DR: A 2026 meta-analysis in Psychological Medicine found postpartum depression (PPD) brain-activity differences across default-mode, limbic, and sensorimotor regions, with spatial overlap in serotonin, dopamine, and vesicular acetylcholine transporter maps. Key Findings 12 imaging studies pooled: The meta-analysis included 475 postpartum depression patients and 504 healthy controls. Higher activity appeared in two regions: PPD was …

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Plasma p-tau217 AI Models Lost Utility Across Cohorts

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Plasma p-tau217 AI Models Lost Utility Across Cohorts

TL;DR: A 2026 medRxiv preprint found that plasma p-tau217 AI models still separated amyloid-positive from amyloid-negative people across ADNI and A4, but calibration drift made the same probabilities less dependable for clinical decisions. Key Findings Calibration drift weakened clinical utility: The study trained plasma biomarker machine-learning models in one Alzheimer’s cohort and tested them in …

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