Pleiotropy occurs when a single gene affects more than one distinct and seemingly unrelated trait. Antagonistic pleiotropy occurs when one of those traits is harmful. It is widely considered to be an important foundation for the evolution of aging, in that natural selection operates strongly during early life, a period characterized by tooth and claw battles for survival and reproductive success. Evolution will select for genes, mechanisms, and biological systems that operate well early and run down later, or otherwise cause harm in later life. The adaptive immune system is an example of the type, a system that works very well right out of the gate in youth, but cannot possibly function indefinitely. It devotes resources to all pathogens encountered, and eventually simply runs out of capacity
from
https://healthnews010.wordpress.com/2019/03/12/have-specific-genetic-examples-of-antagonistic-pleiotropy-been-identified-in-humans/
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