Ultraconserved Human DNA Element 80% Similar To Coelacanth Element

["Richard W. Travsky" <rtravsky@uwyo.edu>]

http://www.nature.com/news/2007/070903/full/449010b.html
...
Only a single ultraconserved element has so far revealed its origins. By 
scanning genome data, Haussler's group found that one human ultraconserved 
element is 80% similar to a piece of DNA found in a 400-million-year-old 
class of ancient fish that includes the coelacanth. The element had been 
shuttled into the fish genome by a genetic invader called a retroposon, 
but mammals have now co-opted it to boost expression of a 
brain-development gene called ISL1.
...