Scientists from the University of Utah examined DNA from 21 primate species and found evidence of an evolutionary war against infectious bacteria over iron that circulates in the host's bloodstream. The team published its research (“Escape from bacterial iron piracy through rapid evolution of transferrin”) in Science and said it demonstrates the vital importance of an increasingly appreciated defensive strategy called nutritional immunity.
“We've known about nutritional immunity for 40 years,” says Matthew Barber, Ph.D., first author and postdoctoral fellow in human genetics at the University of Utah. “What this study shows us is that over the last 40 million years of primate evolution, this battle for iron between bacteria and primates has been a determining factor in our survival as a species.”
The study also models an approach for uncovering reservoirs of genetic resistance to bacterial infections, knowledge that could be used to confront emerging diseases.
Following infection, the familiar sneezing, runny nose, and inflammation are all part of the immune system's attempts to rid the body of hostile invaders. Lesser known is a separate defense against invasive microbes, called nutritional immunity, that quietly takes place under our skin. This defense mechanism starves infectious bacteria by hiding circulating iron. The protein that transports iron in the blood, transferrin, tucks the trace metal safely out of reach.
However, several bacterial pathogens, including those that cause meningitis, gonorrhea, and sepsis, have developed a weapon, transferrin binding protein (TbpA), that latches onto transferrin and steal its iron. Though scientists have known of the offensive strategy, they failed to realize how pivotal the battle over iron has been in the conflict between host and pathogen, according to the Utah team.
“Interactions between host and pathogen are transient and temporary,” says senior author Nels Elde, Ph.D., assistant professor of human genetics at the University of Utah. “It took casting a wide net across all of primate genetic diversity to capture the significance.”
Just as details of a struggle can be gleaned from battle scars, Drs. Barber and Elde reconstructed this evolutionary conflict by documenting when and where changes in transferrin and TbpA have occurred over millennia. They examined the DNA of transferrin in 21 species from the primate family tree, and of TbpA from dozens of bacterial strains. The majority of accumulated changes in transferrin and TbpA cluster around a single region of contact between the two proteins, highlighting it as a site of evolutionary conflict between host and pathogen. The authors then used these genetic observations as a guide to perform experiments, which showed changes in TbpA enable the protein to grasp hold of transferrin, and that recent changes in transferrin allow it to evade TbpA.
“We show that the iron transport protein transferrin is engaged in ancient and ongoing evolutionary conflicts with TbpA, a transferrin surface receptor from bacteria,” wrote the investigators. “Single substitutions in transferrin at rapidly evolving sites reverse TbpA binding, providing a mechanism to counteract bacterial iron piracy among great apes. Furthermore, the C2 transferrin polymorphism in humans evades TbpA variants from Haemophilus influenzae, revealing a functional basis for standing genetic variation. These findings identify a central role for nutritional immunity in the persistent evolutionary conflicts between primates and bacterial pathogens.”
Up to 25% of people in the world's populations have a small alteration in the transferrin gene, which prevents recognition by several infectious bacteria, the most recent sign of this long battle. “Up until this study no one had come up with a functional explanation for why this variation occurs at an appreciable frequency in human populations,” says Elde. “We now know that it is a consequence of the pathogens we and our ancestors faced over millions of years.”
Understanding the strategies that underlie natural defense mechanisms, including nutritional immunity, could inform new approaches to combatting antibiotic-resistant bacteria and emerging diseases. “By examining the natural conflicts that have played out for millions of years, we can determine what has worked, and apply them in new situations,” says Dr. Elde.