The sleeping sickness parasite's tail is crucial for penetrating tissues - trimming it may block or slow it
To keep a pesky animal out of your garden, you just need to make sure the gaps between your fence posts are narrower than the animal. In our bodies, cells similarly create barriers to keep out unwanted invaders, but some pests are particularly crafty. Trypanosoma brucei is a parasite that causes African Sleeping Sickness, and penetrates deep into our tissues. New research has found how it sneaks in so easily. It can deform its body and squeeze through gaps smaller than its diameter. Its movement and shape is driven by a flagellum – a long propellor-like tail – and researchers engineered parasites with modified flagella to see how they work (bottom two video strips, compared to normal parasites, top). Without their natural flagella they struggled to make progress through small gaps. Clearly flagella are crucial to the parasite’s penetrative power, so trimming the tail might be a way of slowing it down.
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