This Special Communication describes obstacles to sharing data and biospecimens and proposes strategies to enhance access and collaboration.
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Genomic reorganization at the transition to gametogenesis
Using a technique called Hi-C analysis, which looks at how DNA is arranged in three dimensions inside the nucleus, the team found that at this transitional point the genome’s three-dimensional organisation becomes less structured and chromosomes become more separated inside the nucleus.
Creating sperm and eggs in the laboratory (in vitro) remains one of the greatest challenges in reproductive biology. To study this process, scientists use primordial germ cell–like cells (PGCLCs), which are lab-generated cells derived from embryonic stem cells that mimic the embryo’s earliest reproductive cells. However, these PCGLCs often fail to complete all the steps of meiosis, making it difficult to create functional sperm and eggs in petri dishes.
After studying the process in germ cells from the embryos, the team studied lab-generated mouse PCGLCs to see if the centromeres migrated to the periphery of the nucleus in vitro too, but they did not see the same phenomenon.
“The presence of this chromosome conformation in embryonic germ cells, but not lab-grown cells, suggests that this structural change could be required for meiosis to proceed properly, and could explain why meiosis is so difficult to recreate outside the body,” says the author, “but we need to do more work to fully characterise the process before we can say for sure.”
“Our study has uncovered a previously unknown and frankly very surprising restructuring of genome architecture that occurs in developing germ cells, which we believe is critical for a successful execution of meiosis,” says the senior author. ScienceMission sciencenewshighlights.
In our cells, our DNA carries chemical or ‘epigenetic’ marks that decide how genes will be used in different tissues. Yet in the group of specialised cells, known as ‘germ cells’, which will later form sperm and eggs, these inherited chemical instructions must be erased or reshuffled so development can begin again with a fresh blueprint in future generations.
MeerKAT discovers record-breaking cosmic laser halfway across the universe
Astronomers using the MeerKAT radio telescope in South Africa have discovered the most distant hydroxyl megamaser ever detected. It is located in a violently merging galaxy more than 8 billion light-years away, opening a new radio astronomy frontier.
Hydroxyl megamasers are natural “space lasers”—extremely bright radio-wavelength emissions produced when hydroxyl molecules in gas-rich, merging galaxies crash into one another. These cosmic collisions compress gas and stimulate large reservoirs of hydroxyl molecules to amplify radio emission.
The physical mechanism is very similar to lasers on Earth, but operates at a much longer wavelength of light of about 18 centimeters, rather than the optical light that our eyes can see. When this special radio light is exceptionally bright, it is termed a megamaser—a “cosmic beacon” that can be seen across vast stretches of the universe.
Alien Reanimation and the Modern Prometheus
An exploration of the themes of Frankenstein in a hard science context and the possibility of biological SETI in deep space.
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An exploration of brain augmentation especially that which involves neural dust
The new JMG Clips channel for sleep!
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The Invincible Matrioshka Brain Star Empire
An exploration of the idea of an all powerful matrioshka brain equipped with a Nicoll-Dyson beam controlling and ruling an entire galaxy.
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