alt Hacker NewsRadical Study Suggests Life on Earth Arose Twice
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The link the site points to seems like a better source (no ads, cites DOI etc, affiliated with AAAS rather than random aggregator website):
The headline is a little confusing. They're still talking about a "split" between bacteria and archaea, so even under this theory, the very roots of metabolism and (I'm guessing) genetic code etc still have a single origin.
Anyway, it does provide a nice reason that bacterial and archaeal cell membranes are different.
Clickbait headline.
Should be "Life left mineral substrate at least twice" or some such. The research is interesting, but they're playing word games in the telling of it by saying the most recent common ancestor of all life wasn't alive (because it was dependent on a mineral surface), but two of it's children gave rise to lineages that were.
I was already under the impression that life on Earth has had several "Game Over -Play Again?" periods.
I assume that the difference here, is that it went completely to zero, before restarting. The other times, there was a bit clinging on, that seeded the restart.
Sounds cool. Anyone with more knowledge that can say if this is really as proven as they suggest and if it is a big thing or not?
what's really going to blow your mind is our solar system looked completely different several times with different proto-planets and Earth/Moon is likely made from remnants of those other planets
* https://en.wikipedia.org/wiki/Formation_and_evolution_of_the...
unfortunately the field of abiogenesis, just like extraterrestrial life, is a lost cause.
The reality we will never be able to replicate creation of life nor find life on other planets (except via contamination). it's why we've never gotten any closer. and i'm not even religious
Origin of life on earth is not very interesting to me. Origin of life in the universe is where it is at...
The idea that life came about by luck is completely absurd, even more so than thinking that a computer chip was created by chance erosion of a silicone wafer in exactly the right pattern.
As I see it life was clearly designed by God.
The metabolic science is really cool. The conclusion that life arose twice requires you to buy that proto-cells that grew on these vents and needed those metallic surfaces to survive didn’t count as “life”. Then, free living cells, bacteria and archea, could maybe be argued as having independent paths as they plugged the gaps in their metabolism independently. Same DNA/RNA, same proteins. Same broad rules of metabolism. Just some alternate paths through chemical space to plug in the metabolic gaps and get free from metal surfaces.
To me, these are clearly not independent paths, but rather the branching of proto-life into two of the great kingdoms of life. It’s a stretch to call this two origins rather than a branching.
Then a couple billion years later, one of em ate the other, and rather than destroy it, they both started a symbiotic relationship, and we were off to the eukaryotic race. This is all the same web of life. Not two independent streams.