If you prefer to read the story rather than listen to it aloud, here's the transcript via npr.org.
Courtesy of Lillian Fritz-Laylan
Naegleria gruberi grows a pair of flagella when under stress. But unlike a sperm tail, it puts these appendages out front, and swims by breast stroke. The organism is stained to emphasize its anatomy.
paper in the current issue of Cell, Naegleria gruberi turns out to have almost 16000 protein-coding genes, which is over two-thirds of what you and I have! A single celled organism with that many genes - no wonder it can transform itself so radically.
Here's an image from the paper illustrating that transformation, which takes a mere 90 minutes or so (far cooler special effects at half the duration of Avatar, if you ask me!):
Is it just me, or does that upper image, of the amoeboid form, remind you of someone? And... I just realized... that someone also has two apparent flagellae at the top of his head, which unfurl during times of stress!! What better proof do you want of our shared ancestry with Naegleria, eh? No? Oh, what - you mean citing widely published and viewed cartoons is not good enough evidence for you (even though that is a standard of evidence good enough for a third of the good people of Texas)? You want all the boring science-y stuff instead? Well, go read the paper then, which the journal Cell has graciously made freely available!
The paper (luckily for you) turns out to be far from boring. It is indeed quite fascinating because, apart from presenting the complete genome sequence of this remarkable free-living protist, Fritz-Laylan et al also describe several genetic modules for aerobic and anaerobic metabolism (for these guys can do both), amoeboid motility, and a number of other structural and functional necessities of the ecologically diverse lifestyles common to their clade. Further, comparisons with genomes of other protists allow them to predict which genes might have been present in the genome of the common ancestor to all eukaryotes. As the first representative of a fifth (out of 6) major clade of eukaryotes whose genomes have been sequenced thus far, Naegleria holds great promise of generating fresh insights into the early evolution and diversificatiion of eukaryotes. While their lineage diverged from the one we hail from about, oh, a billion or so years ago, understanding their genome brings us closer to understanding and reconstructing the genome of our shared ancestors, those early free-living eukaryotes that gave rise to us both. For it turns out that they contain over 4000 protein families that are similar to ones we have, and therefore were likely found in that common ancestor! That ancestor was presumably also quite versatile and equipped with a set of flexible modules to deal with the diverse environments of that time. And that remarkable flexibility probably underlies the extraordinary diversity of organisms that subsequently evolved from that ancestor. How fascinating and wonderful is that! (Even if some of us later lost the ability to transform ourselves and float away when under stress!)