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Organelle dynamics and sequential cell divisions for 200 time points at 44 sec intervals in the early zebrafish brain, 14 hours post fertilization. As seen by adaptive optical lattice light sheet microscopy:

11,952 просмотров • 1 год назад •via X (Twitter)

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How does an embryo reliably "compute" its form - "cell by cell" - using only local interactions and mechanics, yet produce a precise global body plan? I’m excited to share our Nature Methods paper "MultiCell: geometric learning in multicellular development", presenting #AIxBiology research led by Haiqian Yang and the result of a great collaboration with Ming Guo, George Roy, Tomer Stern, Anh Nguyen and Dapeng Bi. A long-standing challenge in developmental biology is to predict how thousands of cells collectively self-organize as tissues fold, divide, and rearrange. In MultiCell, we represent a developing embryo as a dual graph that unifies two complementary views of tissue mechanics with single-cell resolution: cells as moving points (granular) and cells as a connected foam (junction network). This lets the model learn dynamics from both geometry and cell–cell connectivity. On whole-embryo 4D light-sheet movies of Drosophila gastrulation (~5,000 cells), our model predicts key cell behaviors and the timing of events, including junction loss, rearrangements, and divisions with high accuracy, at single-cell resolution. Beyond prediction, the same representation supports robust time alignment across embryos and offers interpretable activation maps that highlight the morphogenetic "drivers" of development. The broader goal is a foundation for cell-by-cell forecasting in more complex tissues, and eventually for detecting subtle dynamical signatures of disease. Kudos to the team for this inspiring collaboration with brilliant researchers to push the boundary of AI for biology! Citation: Yang, H., Roy, G., Nguyen, A.Q., Buehler, M.J., et al. MultiCell: geometric learning in multicellular development. Nature Methods (2025), DOI: 10.1038/s41592-025-02983-x Code/data links are in the manuscript.

Markus J. Buehler

387,977 просмотров • 7 месяцев назад

My top five tips to battle jet lag. 1. Early morning bright light exposure - This must be outside light from the sun. Aim for 30 minutes minimum. Light is the strongest zeitgeber that synchronizes the brain and body with the time zone you are in and resets your biological clock. The bright light signals to the brain that it's morning and time to wake up, and also activates the cortisol awakening response and inhibits melatonin production. 2. Exercise - Another zeitgeber that helps realign your circadian rhythm (your internal clock). Plus, it's great for your health. 3. High-dose creatine - Creatine can help support brain health in the context of stress. Jet lag is a big stress in the brain. Creatine starts to accumulate in the brain at a dose of 10g per day, and studies have found that 20-25g of creatine can improve brain function in the context of sleep deprivation. May not work for everyone but it works for me. 4. Strategic melatonin timing - A small dose of melatonin a couple of hours before you want to sleep helps signal to the brain it’s time to get ready for bed. This really helps when your internal clock thinks it is still daytime. 5. Avoid blue light exposure during the evening - Blue light inhibits melatonin, which is the last thing you want to do in the evening. Melatonin is the hormone that helps make you feel ready to sleep. Dimming lights or blue light-blocking glasses do the trick.

Dr. Rhonda Patrick

86,509 просмотров • 10 месяцев назад