Medicine Needs Evolution-From This Weeks Science

[Dr Ron]

Post from The Democratic Daily
http://blog.thedemocraticdaily.com/?p=2039#more-2039

This week’s Science shows the importance of evolution as “the vibrant foundation for all biology.” While the flat earthers on the right continue to deny that evolution is well established, and that this is a controversy which exists only in their deranged minds, the significance of evolution is demonstrated in such scientific literature:


Medicine Needs Evolution

The citation of “Evolution in Action” as Science’s 2005 breakthrough of the year confirms that evolution is the vibrant foundation for all biology. Its contributions to understanding infectious disease and genetics are widely recognized, but its full potential for use in medicine has yet to be realized. Some insights have immediate clinical applications, but most are fundamental, as is the case in other basic sciences. Simply put, training in evolutionary thinking can help both biomedical researchers and clinicians ask useful questions that they might not otherwise pose.

Although anatomy, physiology, biochemistry, and embryology are recognized as basic sciences for medicine, evolutionary biology is not. Future clinicians are generally not taught evolutionary explanations for why our bodies are vulnerable to certain kinds of failure. The narrowness of the birth canal, the existence of wisdom teeth, and the persistence of genes that cause bipolar disease and senescence all have their origins in our evolutionary history. In a whole array of clinical and basic science challenges, evolutionary biology is turning out to be crucial. For example, the evolution of antibiotic resistance is widely recognized, but few appreciate how competition among bacteria has shaped chemical weapons and resistance factors in an arms race that has been going on for hundreds of millions of years. The incorrect idea that selection reliably shapes a happy coexistence of hosts and pathogens persists, despite evidence for the evolution of increased virulence when disease transmission occurs through vectors such as insects, needles, or clinicians’hands. There is growing recognition that cough, fever, and diarrhea are useful responses shaped by natural selection, but knowing when is it safe to block them will require studies grounded in an understanding of how selection shaped the systems that regulate such defenses and the compromises that had to be struck.

Evolution is also the origin of apparent anatomical anomalies such as the vulnerabilities of the lower back. Biochemistry courses cover bilirubin metabolism, but an evolutionary explanation for why bilirubin is synthesized at all is new: It is an efficient free-radical scavenger. Pharmacology emphasizes individual variation in genes encoding cytochrome P450s, but their evolutionary origins in processing dietary toxins are just being fully appreciated. In physiology, fetal nutritional stress appears to flip an evolved switch that sets the body into a state that protects against starvation. When these individuals encounter modern diets, they respond with the deadly metabolic syndrome of obesity, hypertension, and diabetes.

The rest of the article is at the Democratic Daily (link above) and at Science:
http://www.sciencemag.org/cgi/content/summary/311/5764/1071