[LINK] "Junk" DNA revealed as information processing system?

EphemeralNight

http://spectrum.ieee.org/tech-talk/at-work/test-and-measurement/re-imagining-our-genes-encode-project-reveals-genome-as-an-information-processing-system/?utm_source=techalert&utm_medium=email&utm_camp

Just a few years ago, the prevailing wisdom said that the genome comprises 3 percent or so genes and 97 percent “junk” (with 2 or 3 percent of that junk consisting of the fossilized remains of retroviruses that infected our ancestors somewhere along the line). After a decade of painstaking analysis by more than 200 scientists, the new ENCODE data show that indeed 2.94 percent of the genome is protein-coding genes, while 80.4 percent of sequences regulate how those genes get turned on, turned off, expressed, processed, and modified.

This fundamentally changes how most biologists understand the master instruction set of life: we are, in short, 3 percent input/output and 80 percent logic. (Though perhaps a surprise to biologists, the finding will hardly astound anyone who has designed a complex interactive system.)

Correct me if I'm wrong, but this is a really big deal, right?

Just a few years ago, the prevailing wisdom said that the genome comprises 3 percent or so genes and 97 percent “junk” (with 2 or 3 percent of that junk consisting of the fossilized remains of retroviruses that infected our ancestors somewhere along the line). After a decade of painstaking analysis by more than 200 scientists, the new ENCODE data show that indeed 2.94 percent of the genome is protein-coding genes, while 80.4 percent of sequences regulate how those genes get turned on, turned off, expressed, processed, and modified.

This fundamentally changes how most biologists understand the master instruction set of life: we are, in short, 3 percent input/output and 80 percent logic. (Though perhaps a surprise to biologists, the finding will hardly astound anyone who has designed a complex interactive system.)

Correct me if I'm wrong, but this is a really big deal, right?

Correct me if I'm wrong, but this is a really big deal, right?

Mmmm. It's new data, which is important, but it's not new data that particularly upsets any accepted theoretical models.

It was easy to figure out the count of human proteins to human DNA base pairs, and figure out only a small fraction was actually protein coding back in the 1970s. So people started theorizing about all the rest being junk. We knew something of the 97% had to be regulatory in function, and everybody had their own preferred guesses. Those guesses have been steadily moving higher over the last 20 years (at least). Now we (apparently) know it's on the order of 80% that's regulatory, instead of 3% or 10% of 30% or whatever else people were theorizing.

It does suggest true parasite DNA is a lot less common than some thought (especially back in the 1970s). But there's still lots of room in the remaining 17% for parasite DNA, so while the magnitude has been reduced, the underlying theories still have a good chunk of the genome to play in.

... on the order of 80% that's regulatory ...

No.

1 Less than 2% is coding

2 About 8% is known to be regulatory. Most of the interesting stuff from the ENCODE project is about what parts do what in what cells in this category

3 Given how they looked, it is likely that another 10% or so is regulatory in cells that they have not looked at.

4 20% or so has absolutely no effect

5 When they talk about 80% being "functional" that is in the weakest sense of the word functional that anyone has even played with. Typical examples of the functions of the ... (read more)

4Manfred14y

Catching yourself explaining something that doesn't need explaining is an excellent opportunity to recalibrate :D