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Re: Mice "given" bat-like limbs; bet they want to give them back
I gave up cheap shots for the New Year so I will pass by Dann's humorous
question re interspecific behavior standards; hmmm, spiders eat their mates,
pigs eat their own young, cows defecate anywhere ... damn, there goes another
New Year's resolution. Anyway, half my genome consisting of "retrovirus corpses
in various stages of decay" would explain a lot. Makes the old "your ancestor
was a monkey" insult look like small potatoes.
As David points out, lateral transfer may be way more important than anyone
currently accepts. By logic, many of these events are benign or beneficial, but
some might be catastrophic, species level or above. Surely many speculations or
hypotheses have been advanced that attempt to tie the probability of a
catastrophic event to average species lifespan; does anyone know of one that is
----- Original Message ----
From: David Marjanovic <firstname.lastname@example.org>
To: DML <email@example.com>
Sent: Saturday, January 19, 2008 6:20:44 AM
Subject: Re: Mice given bat-like forelimbs through gene switch
> Retroviruses are be able to combine the DNA of different species. In
> endogenous retrovirus sequences have become a permanent part of the
> genome. Up to 8% of our genes once belonged to other species.
If you count all the retrotransposons and the formerly transposable
(like LINEs and SINEs) as retrovirus material, over half (53 % or so)
genome consists of retrovirus corpses in various stages of decay...
> Bacteria are able to exchange gene sequences not just between
> of the same species, but between different bacterial species.
Not only. Don't you remember the famous photo of a hamster cell and two
bacterial cells doing it?
That must be why vertebrates share some genes with bacteria but with
else... and why the bacterium *Mycoplasma genitalium* contains genes
synthesis of cholesterol, something otherwise limited to eukaryotes...
mind all the genes spread across (hyper)thermophilic bacteria and
In fact, what is a bacterial "species" or an archaeal "one"? Most
concepts are simply not applicable, and the rest needs arbitrary cutoff
points (% similarity in genome sequence, % similarity in AT content).
would make a lot more sense to just talk about clades.