In the 1970s, scientists from several countries proposed to reconstruct, one by one, all the neurons in the brain as they appear under an electron microscope. They started with a small worm. Caenorhabditis elegans has only 302 neurons. It took 16 years. How much time would be required to repeat this arduous task for the 100 billion neurons in the human brain?
In the 1970s, scientists from several countries proposed to reconstruct, one by one, all the neurons in the brain as they appear under an electron microscope. They started with a small worm. Caenorhabditis elegans has only 302 neurons. It took 16 years. How much time would be required to repeat this arduous task for the 100 billion neurons in the human brain?
In the 1970s, scientists from several countries proposed to reconstruct, one by one, all the neurons in the brain as they appear under an electron microscope. They started with a small worm. Caenorhabditis elegans has only 302 neurons. It took 16 years. How much time would be required to repeat this arduous task for the 100 billion neurons in the human brain?
The map of the human brain is not a static image of the cellular architecture of the central nervous system (CNS). Throughout life, all living beings are born, develop and age. The brain of pregnant mothers reflects a dynamic that modifies this general picture. A collaboration of scientists from the University of California has studied the changes in the adult brain during pregnancy and observed that a large part of it adapts during the development of the fetus.
To understand the human brain, an international consortium of scientists has created the most complete atlas of this organ to date. The map reveals the anatomy, the architecture of the tissues, how or where each cell is, their function, gene expression and regulation. On Oct. 12, 2023, Science and Science Advances published a group of 21 studies that unveiled the map of the human brain, as well as the brains of nonhuman primates and mice, cell by cell, for an adult model and for the different stages of development.
While the liver is mostly known as the core of metabolism, contributing to the storage of nutrients and excretion of toxic substances, there is an increasing interest in how it interacts with the central nervous system through the liver-brain axis. At the 2023 European Association for the Study of the Liver (EASL) meeting in Vienna, Austria, group leader Kristina Schoonjans and her colleague Hadrien Demagny from the Laboratory of Metabolic Signaling at École Polytechnique Fédérale de Lausanne, Switzerland, gave talks setting out the context of inter-organ communication in liver disease, adding new findings from their research in the liver-brain axis.
The degradation pathways of cellular components can be shared by different molecules or selectively replace different substances and organelles. In the brain, synaptic transmission involves signaling pathways for a wide range of molecules, vesicles and receptors that require constant recycling. A proteomic study from the University of Lausanne and the University of Fribourg sheds light on brain autophagy-selective routes in adolescent, adult and aged brains.
The map of the genetic activity of the risk genes that affect the central nervous system (CNS) reveals the molecular signatures associated with the neurological pathologies in this organ. A study by researchers at McGill University in Canada and the Allen Institute for Brain Science in Washington compared 40 brain diseases with this technology and classified them into five groups whose members shared the same transcriptional pattern.
Attempts to modernize the conceptual framework of brain function and dysfunction are one prerequisite for brain disorders to benefit from precision medicine. For the circuit-based insights that are slowly emerging to benefit patients, though, better targeting methods are needed.
Brain disorders have not yet profited from advances in precision medicine to the same extent that other disorders have. With the advent of magnetic resonance imaging and other technologies, watching the brain at work has made great strides in recent decades. But those data have often been shoehorned into the categories of the Diagnostic and Statistical Manual of Mental Disorders. Researchers are working to bring diagnostic categories in line with a modern understanding the brain.
