(Interesting article. But what is it for? Obviously Climate Change is not related to this because humans & animals living in hot climates & those living near the equator of the earth & those living in deserts like the middle-east & Africa are very fertile. Only thing I can think of affecting sperm in a semi-thermodynamic way is... the sun cycles? Or magnetic pole excursions? ??? Outerspace?) https://around.uoregon.edu/content/uo-researchers-show-why-heat-stress-damages-sperm •••Oct 23, 2020 - “I think this is a hallmark paper because it shows an environmental effect that alters specific DNA sequences and presumably the proteins that control their activity,” Hawley said. “What Diana and Nicole’s work has done is to clearly say what goes wrong, at the level of molecules, when sperm-making is altered by heat, at least in worms.” The paper also helps to understand how meiosis, the process that produces sex cells, differs between sperm and eggs. Sperm, the smallest cell in a person’s body, form by the billions at temperatures below body temperature and are produced throughout the entire adult lifespan. Eggs, the largest cells in a person’s body, are formed internally, where a consistent temperature is maintained, and are produced only for a limited time during fetal development. “We know that sperm development is very sensitive to increased temperature, while egg development is not affected,” Kurhanewicz said. “The data presented in this paper suggest that another way egg and sperm develop differently is in how tightly they control the ability of mobile DNA elements, which are also known as ‘jumping genes’ or transposons, to move in the genome, and how sensitive to heat stress those mechanisms are in preventing that movement.” Transposons are DNA segments that move around and alter genetic information by inserting themselves in new positions. They also leave DNA damage in their wake. Movement of “jumping genes” is normally repressed in developing sperm and eggs; however, the new study found that with exposure to heat, transposons are moving specifically in developing sperm...
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