“Dr. Luján and his team have identified the mechanism by which giardia controls its coat proteins, they report in the current issue of Nature. Each of the parasite’s 190 coat genes is the recipe for making a different protein, and the parasite switches its coat every 10 generations or so. To produce the coat, giardia does not switch these genes on one at a time, as might be expected. Instead, it seems to leave them all turned on, allowing each to generate a messenger RNA copy of itself. Usually the messenger RNAs would direct the synthesis of proteins, but giardia then destroys all but one of the messengers, and the survivor makes the coat of the day.”
reminds me of learning about the glycoprotein coating on influenza (similarly targeted by antivirals)
