Researchers at University of California San Diego School of Medicine previously found a set of human gene mutations that protect older adults against cognitive decline and dementia. In a new study, published July 9, 2022 in Molecular Biology and Evolution, they focus on one of these mutated genes and attempt to trace its evolution—when and why it appeared in the human genome. The findings suggest selective pressure from infectious pathogens like gonorrhea may have promoted the emergence of this gene variant in Homo sapiens, and inadvertently supported the existence of grandparents in human society.
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Source: Phys.org