Are Selfish Genes Selfish? Are Retro-transposons Junk?
|January 12, 2012||Posted by PaV under 'Junk DNA', Darwinism|
At PhysOrg.com, they have an article dealing with the CTCF protein and its binding sites. It turns out that the CTCF has both binding sites that are common to all mammalian lineages, and thus “conserved” and “ancient”, as well as binding sites found only in particular lineages. The binding sites found only in particular lineages are embedded inside “retro-transposons”, which “use a copy-paste mechanism to spread copies of themselves throughout the genome.”
The retro-transposon’s copy-and-paste behaviour has long been considered totally self-serving. However, the study showed that when a retro-transposon containing a CTCF-binding sequence spreads around a mammal’s genome, it can deposit functional CTCF binding sites in novel locations, altering the activity of distant genes.
We looked at six mammalian species representing primates, marsupials, rodents and carnivores, and discovered a simple mechanism that they all use to remodel their DNA . . . ”
Another day; another bad day for Darwinism. It looks like “junk” isn’t “junk” after all. FYI, here’s the link.