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Freely access electrophysiological, morphological, and transcriptomic data measured from thousands of individual mouse & human brain cells via the Allen Cell Types Database: #openscience #SfN23

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allen institute

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30,847 просмотров • 2 лет назад •via X (Twitter)

Здоровье и велнесНаука и технологииОбразование#openscience#SfN23
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Researchers can freely access the Allen Mouse Brain Common Coordinate Framework (v3), a complete and high-resolution 3D atlas of the mouse brain. Learn more about it at #SfN23
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Researchers can freely access the Allen Mouse Brain Common Coordinate Framework (v3), a complete and high-resolution 3D atlas of the mouse brain. Learn more about it at #SfN23

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Beautiful new paper: methods for getting stem-cell derived retinal ganglion cells to integrate into the retina (mouse). Cells were capable of migrating & surviving. #NEIfunded Baranov Lab Levi Todd Mass Eye and Ear Harvard Ophthalmology PNASNews paper:
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Beautiful new paper: methods for getting stem-cell derived retinal ganglion cells to integrate into the retina (mouse). Cells were capable of migrating & surviving. #NEIfunded Baranov Lab Levi Todd Mass Eye and Ear Harvard Ophthalmology PNASNews paper:

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🚨: A petri dish of human brain cells just learned to play DOOM
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🚨: A petri dish of human brain cells just learned to play DOOM

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Scientists have successfully trained a petri dish of human brain cells to play DOOM.
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Cells located in the midline of the embryo play crucial roles in development. These cells often influence cell fate decisions and guide axons to establish bilateral connections. Despite their importance, studying these transient cells and their complex interactions has been challenging. Today, we introduce human midline #assembloids—3D self-organizing cellular clusters derived from stem cells by the functional integration of floor plate #organoids and spinal cord #organoids. We demonstrate that midline assembloids enable cell specification and axon guidance in human neurons. Additionally, we use these assembloids to screen and identify human-enriched factors that control these processes. Work led by the incredible Massimo Onesto & Neal Amin!! More details in the preprint 👇
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Cells located in the midline of the embryo play crucial roles in development. These cells often influence cell fate decisions and guide axons to establish bilateral connections. Despite their importance, studying these transient cells and their complex interactions has been challenging. Today, we introduce human midline #assembloids—3D self-organizing cellular clusters derived from stem cells by the functional integration of floor plate #organoids and spinal cord #organoids. We demonstrate that midline assembloids enable cell specification and axon guidance in human neurons. Additionally, we use these assembloids to screen and identify human-enriched factors that control these processes. Work led by the incredible Massimo Onesto & Neal Amin!! More details in the preprint 👇

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This is only 1 Niagara emitter to handle thousands of decals as particles using Data Channels! Significantly lower overhead on the GameThread and only a single component per grid cell. This also adds instancing to the decals which is normally not supported for individual decal components. Working on this as part of data-oriented projectiles that run without Actors, asynchronous collision and supporting multiplayer (incl. client side prediction). Removes a huge amount of overhead from the CPU, more on that soon!

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New Cell paper from Bergles lab at Johns Hopkins just built the most comprehensive map of brain myelin ever made — every oligodendrocyte, across the entire mouse brain, across the lifespan. The scale: >10 million cells per brain, terabyte-scale 3D lightsheet volumes, registered to the Allen Brain Atlas across 417 regions from 2 months to 2+ years of age. The technical stack: Custom tissue clearing (CUBIC-L + SHIELD + uRIMS with 40% urea) to preserve endogenous fluorescence. 3D Mask R-CNN for instance segmentation — not just semantic, instance — so it can distinguish individual cells within dense clusters at scale via overlapping sliding windows. Vision Transformer to classify newly-formed vs. mature oligodendrocytes using soma morphology. All cross-referenced against Allen ISH transcriptomics and MICrONS serial EM. What they found: Oligodendrocyte density varies 10,000-fold across brain regions. Left-right hemispheres: r=0.99. Sex: no significant difference. Strain: matters. The brain never stops myelinating. New oligodendrocytes are still being generated in 2-year-old mice. Prefrontal cortex L6 shows the fastest rates of new myelination into old age — the circuits for executive function keep rewiring throughout life. After demyelination, L4 sensory cortex is the most resilient — oligodendrocytes survive at higher rates. The hippocampus loses nearly everything and barely recovers. Degree of injury doesn't predict rate of recovery. These are independent axes. The Alzheimer's result is the most surprising: Dense-core plaques dominate in cortex and hippocampus. Diffuse/small-core plaques dominate in white matter fiber tracts. Old assumption: diffuse plaques are "less toxic." The data says the opposite — small plaques in fiber tracts cause more myelin loss per plaque than dense-core plaques in gray matter. Plaque load and oligodendrocyte loss are essentially uncorrelated (ρ=0.22). The damage is plaque-type and location specific, not load-dependent. For MS and AD research: you can't read off white matter injury from gray matter plaque burden. The pathology in fiber tracts is running on different rules. Data: Paper:
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