Retinal degenerations, such as age-related macular degeneration and retinitis pigmentosa, present significant challenges due to genetic heterogeneity, limited therapeutic options, and the progressive loss of photoreceptors in advanced stages. These challenges are compounded by difficulties in precisely targeting residual retinal neurons and ensuring the sustained efficacy of interventions. Optogenetics offers a novel approach to vision restoration by inducing light sensitivity in residual retinal neurons through gene delivery of light-sensitive opsins. This review traces the evolution of opsins in optogenetic therapies, highlighting advancements from early research on channelrhodopsin-2 (ChR2) to engineered variants addressing key limitations.
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Potential Treatment for Parkinson’s Using Investigational Cell Therapy Shows Early Promise
Learn how a stem cell-derived treatment shows potential for treating Parkinson’s disease.
Linking maternal autoantibodies to premature birth
A typical pregnancy lasts 40 weeks, but for about 1 in 10 pregnant women labor begins too soon. Premature or preterm birth is the leading cause of newborn deaths worldwide. Yet doctors have struggled to understand why preterm birth occurs — or how to predict which pregnancies are at highest risk.
Now, researchers have discovered antibodies that play a role in triggering early labor. The antibodies were present in higher levels and appeared earlier in pregnancy in women who went on to give birth to their babies before 37 weeks’ gestation compared to women who delivered their babies at term.
The research was published in Nature Immunology and could lead to both new ways of screening for preterm birth risk and new interventions to stop it.
The Number of Teeth in Your Mouth Could Be a Major Warning Sign of Dementia
We still don’t fully understand the causes of dementia, but scientists are making progress.
Most encouragingly, research suggests that almost half of dementia cases could be reduced, at least temporarily, thanks to modifiable risk factors that can help to prevent or postpone the disease from occurring.
But a new study reveals we might have been overlooking a serious risk factor for cognitive decline, and it’s been hiding right under our nose.
Scientists Discovered Something Unsettling About Your Brain Under Anesthesia
It sounds like a nightmare. The idea of anesthesia wearing off in the middle of a procedure and suddenly getting an eyeful of your own insides. Thankfully, anesthesiologists are generally very good at their jobs. When they put you under, you’re not supposed to be awake or aware of anything. But according to new research published in Nature, that doesn’t necessarily mean every part of your brain is shut down.
Scientists have assumed that general anesthesia shuts down your higher-level brain activity, the parts associated with consciousness. But a team of researchers from Baylor College of Medicine found that even while patients were fully anesthetized, individual neurons in the hippocampus were still up and running, doing all of the memorization and learning stuff that the hippocampus is supposed to do.
Using high-density Neuropixels probes implanted in seven epilepsy patients undergoing surgery, researchers were able to monitor hundreds of individual neurons while patients were unconscious. They were played a series of sounds through headphones while under anesthesia and watched how the brain responded. The sounds included podcasts, stories, and different bits of human speech.
Mouse study offers clues to a possible new way of slowing Alzheimer’s
A little-discussed gene could help the brain contain toxic protein buildup, offering researchers a promising new target.
Strange quantum experiment shows “negative time” is more than an illusion
Photons traveling through a cloud of atoms can emerge so early that they appear to have spent a negative amount of time inside. Researchers tested whether this was merely a misleading feature of the light pulse by making extremely weak measurements of the atoms. Surprisingly, the atoms confirmed the same negative dwell time. The finding does not break standard physics, but it reveals that one of quantum mechanics’ strangest effects is physically measurable.
New culprit in early Alzheimer’s: blood–brain barrier blocks protective proteins
The brain relies on crucial proteins to maintain neurons. This system is disrupted in mice with neurological disease.
Do AI Models Know What They’re Thinking About?
Podcast episode · the quanta podcast · november 10 · 33m
Scientists Issue ‘Words of Warning’ After Strange Discovery in Danish Skeletons
There’s something strange about some of the skeletons buried in monasteries in Denmark.
Some seem to date back decades – or even centuries – before their final resting places were even built.
So what’s going on?
Scientists from the University of Southern Denmark and the Center for Isotope Research believe they’ve found the answer.