Earlier this month, Nature released a paper describing the major results of the Chinese Panda
Genome Project: a draft sequence covering 94% of the bear’s genome. Thanks to
the “cuddly” factor – who doesn’t love the cute fluffy pandas? -- the paper
got a fair bit of press. And almost all of those articles focused on bits of
the panda genome that seemed a little surprising: that pandas can’t make
enzymes for digesting cellulose even though they eat nothing but bamboo, that
they can make enzymes for digesting meat and fat despite their vegetarian diet,
and that that they can’t taste meat thanks to a mutation that knocked out the unami
receptors on their tongues.
There’s just one problem: those things might be surprising
if you just think of a panda as a weird bear with a grass-eating habit, but they
actually make a lot of sense when you pull back and look at pandas in the context
of their evolutionary history. The place where pandas sit on their family tree lets
you predict what you might find in their genes. And in this case, those
predictions would be confirmed. Let’s look at those ‘surprising results’ again below the fold:
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