One specific gene mutation helped turn humans into long-distance runners
A gene mutation millions of years ago gave modern humans the ability to run long distances, a new study has found.
This single change in one strand in the DNA completely altered the path of the human species, making forest dwellers into hunter-gatherers who eventually dominated the world.
About 2 to 3 million years ago, a single mutation in the DNA of the early human species triggered a series of changes in the body, including the ability to run long distances without feeling exhausted. This is how humans distinguished themselves from other mammals during the hunter-gatherer phase. Instead of releasing a quick spurt of energy like a cheetah to catch a prey, humans pursue their target until it is too tired to keep running.
The tactic proved to be effective especially when the forests in Africa became savannahs and eventually, the human ancestors started to evolve dramatically. Early hominids, who developed longer and springy legs, bigger feet, strong gluteal muscles, lost their fur and expanded sweat glands that helped make the species great long-distance runners.
The gene in question is called the CMP-Neu5Ac Hydroxylase or CMAH.
“We evaluated the exercise capacity (of mice lacking the CMAH gene), and noted an increased performance during treadmill testing and after 15 days of voluntary wheel running,” stated graduate student and study author Jon Okerblom.
According to the study, the mice that have broken CMAH, like humans, were able to run 12 percent faster and 20 percent longer than those who have the normal gene. They also have more blood vessels into their leg muscles that contract longer when in motion.