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Genetic Linkage

Gene Splicing in Lice and the Challenge of Clothing

A terrific article recently published in Molecular Biology and Evolution, “Alternative Splice in Alternative Lice,” provides a compelling example of maximizing genome information – adaptation of the louse Pediculus humanus to the new habitat created when our ancestors invented clothing.

HEAD VS BODY LICE
Many parents encounter head lice when their children are sent home from school with instructions to get rid of the horrible rice-krispie-like eggs (“nits”) clinging to their scalp hairs. A good washing won’t do it. Medication and clunky combs do very little alone. The sooner the poor parent realizes that meticulous nit-picking is the only solution, the sooner the nightmare ends.

But consider the louse’s point of view.

Lice live on us so that they can drink our blood, with a little help from bacteria that provide the B vitamins needed to extract maximal nutrients from their meals. Head lice lay their eggs on our hair shafts, gluing them in place. These are the much more common variety. They don’t carry disease, and are mostly an annoyance.  Read More 
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