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Study finds that fear can travel quickly through generations of mice DNA
Key Excerpts from Article on Website of Washington Post
Posted: October 31st, 2021
https://www.washingtonpost.com/national/health-science/study...
Researchers taught male mice to fear the smell of cherry blossoms by associating the scent with mild foot shocks. Two weeks later, they bred with females. The resulting pups were raised to adulthood having never been exposed to the smell. Yet when the critters caught a whiff of it for the first time, they suddenly became anxious and fearful. They were even born with more cherry-blossom-detecting neurons in their noses and more brain space devoted to cherry-blossom-smelling. The memory transmission extended out another generation when these male mice bred. Neuroscientists at Emory University found that genetic markers, thought to be wiped clean before birth, were used to transmit a single traumatic experience across generations, leaving behind traces in the behavior and anatomy of future pups. The study, published ... in the journal Nature Neuroscience, adds to a growing pile of evidence suggesting that characteristics outside of the strict genetic code may also be acquired from our parents through epigenetic inheritance. Epigenetics studies how molecules act as DNA markers that influence how the genome is read. We pick up these epigenetic markers during our lives and in various locations on our body as we develop and interact with our environment. The researchers also artificially inseminated females using the sperm from the original fear-conditioned mice. The results were the same, suggesting epigenetic inheritance rather than environment.
Note: The emerging field of epigenetics implies that lifestyle and environment influence the expression of DNA. For more along these lines, see concise summaries of deeply revealing news articles on health from reliable major media sources.
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