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New method allows first look at key stage of human development, embryo implantation
Accompanying commentary recommends revisiting current bioethical guidelines in light of advance       Despite significant biomedical advances in recent decades, the very earliest events of human development­—those that occur during a critical window just after fertilization—h...
An experimental Alzheimer’s drug reverses genetic changes thought to spur the disease
Aging takes its toll on the brain, and the cells of the hippocampus—a brain region with circuitry crucial to learning and memory—are particularly vulnerable to changes that can lead to Alzheimer’s disease or cognitive decline. With the hope of counteracting the changes that can lead to these t...
Mice engineered with rare kidney disease provide new insights about how cells repair broken DNA
Like jewels in a vault, our precious genetic material is stored in the nucleus of a cell—sequestered away from potentially damaging cellular components and toxins so that no harm can come to it. Yet over the course of a life moving through this world, our DNA does get damaged, and our cells have ...
A common brain cell shapes the nervous system in unexpected ways
More than half of our brains are made up of glial cells, which wrap around nerve fibers and insulate them—similarly to how the plastic casing of an electric cable insulates the copper wire within—allowing electrical and chemical impulses to travel faster. In the past, neuroscientists considered ...
A newly discovered way for cells to die
Some cells are meant to live, and some are meant to die. The linker cell of Caenorhabditis elegans, a tiny worm that is a favored model organism for biologists, is among those destined for termination. This cell helps determine the shape of the gonad in male worms—and then it dies, after two days...
Sweet tooth? Flies have it too—and new research explains how they know what to eat and when to stop
All animals, including humans, love sweet food. But if you’re someone who never turns down dessert under normal circumstances, try wolfing down six donuts as a scientific experiment. Even the moistest, most velvety piece of chocolate cake will seem a lot less appetizing—and you will likely eat l...
Using magnetic forces to control neurons, study finds the brain plays key role in glucose metabolism
To learn what different cells do, scientists switch them on and off and observe what the effects are. There are many methods that do this, but they all have problems: too invasive, or too slow, or not precise enough. Now, a new method to control the activity of neurons in mice, devised by scienti...
Parasites reveal how evolution has molded an ancient nuclear structure
Long before animals evolved from sponges, and before plants evolved out of algae, there was a pivotal event that allowed complex, multicellular organisms to arise: the development of the nucleus in single-celled organisms. Eukaryotes, one of the three main branches of living organisms, are define...
A virus common among livestock depends on a microRNA to replicate
In the ongoing arms race between pathogenic viruses and the cells they infect, each side needs every advantage it can get. One way wily viruses can get a leg up is by subverting the microRNAs (miRNAs) of their host. These miRNAs are small stretches of RNA made by host cells to regulate gene expre...
New findings suggest severe tornado outbreaks are increasingly common
One tornado alone can cause intense destruction, but the largest impact on both death rates and economic losses stems from “outbreaks,” in which six or more tornadoes occur within a limited time. New research from Joel Cohen, Abby Rockefeller Mauzé Professor and head of the Laboratory of Pop...
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