Current Consensus Regarding Abiogenesis

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Discussion Overview

The discussion revolves around the current understanding and consensus regarding abiogenesis, including the various competing hypotheses and the challenges associated with testing these ideas. Participants explore the interdisciplinary nature of abiogenesis research, particularly the role of chemistry in biological studies.

Discussion Character

  • Debate/contested
  • Technical explanation
  • Exploratory

Main Points Raised

  • Some participants note that there is no real consensus on abiogenesis, but rather multiple competing hypotheses exist.
  • It is suggested that biologists often require assistance from chemists when studying abiogenesis due to its heavy reliance on chemistry.
  • Two main competing theories have emerged: "soup" theory and "vent" theory, both of which are considered potentially testable.
  • Participants mention that the field has been characterized by decades of modeling, with a shift towards testing theories in the future.
  • There are claims that only the vent environment can lead to chemiosmosis, which some argue may render the soup theory less relevant.
  • Discussion includes references to ongoing tests related to the vent theory, indicating a focus on empirical validation.
  • Some participants express interest in the broader implications of abiogenesis research, linking it to cosmology and planetary sciences.

Areas of Agreement / Disagreement

Participants generally agree that there is no consensus on abiogenesis and that multiple competing views remain. The discussion reflects uncertainty regarding the validity and testability of various models.

Contextual Notes

Participants highlight the historical context of the field, noting that it has been primarily theoretical for many years, with a recent push towards empirical testing. There are also mentions of unresolved questions regarding the conditions of early Earth and the implications for abiogenesis.

Who May Find This Useful

This discussion may be of interest to biologists, chemists, astrobiologists, and anyone studying the origins of life or the interdisciplinary connections between biology and chemistry.

Amrator
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What is the current consensus among biologists regarding abiogenesis (or ideas of abiogenesis)? Are there any obstacles to testing it?

Thanks.

Edit: Also, abiogenesis seems pretty heavy on chemistry. Do biologists usually require help from chemists when studying abiogenesis?
 
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https://en.wikipedia.org/wiki/Abiogenesis#Current_models

There is not real consensus, but rather a number of competing hypotheses.

And yes, biologists need help from the chemists here. Abiogenesis was once known as "chemical evolution" since it is more the study of self-replicating chemicals on the way to becoming living things rather than the study of living things.
 
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General note but many fields of biology have a heavy chemistry component.
 
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Ryan_m_b said:
General note but many fields of biology have a heavy chemistry component.

Enough so that I would recommend that most aspiring biologists pursue undergraduate majors in ACS accredited chemistry programs and then pick a biological specialty in graduate school.

There are too many biologists who are too weak in math, chemistry, and the physical sciences. Those who are strong in math, chemistry, and the physical sciences are always in greater demand.
 
Dr. Courtney said:
Enough so that I would recommend that most aspiring biologists pursue undergraduate majors in ACS accredited chemistry programs and then pick a biological specialty in graduate school.

There are too many biologists who are too weak in math, chemistry, and the physical sciences. Those who are strong in math, chemistry, and the physical sciences are always in greater demand.

I have no clue about the educational system you are referring to but I don't disagree with the sentiment. Studying mathematics and chemistry (alongside biology) before embarking on a university level biology course would be very beneficial.
 
Amrator said:
What is the current consensus among biologists regarding abiogenesis (or ideas of abiogenesis)? Are there any obstacles to testing it?

Thanks.

Edit: Also, abiogenesis seems pretty heavy on chemistry. Do biologists usually require help from chemists when studying abiogenesis?

A very good question!

Alas, there is still no consensus. The field has been described as 50 years of modeling (100 if you count from Oparin), looking forward to 50 years of tests. (From around -00, IIRC; I am not sure I can pull out the reference at this time.)

But it now seems two possible, competing theories have emerged, "soup" and "vent" theories (also called protocell theory vs fuel cell theory). Those are - at least in principle - testable in toto, and it was exciting to see that this years Astrobiology 2015 conference included a session devoted to tests - astrobiology is now "normal science"! (Theories and tests.) I note that it seems only vent theory tests were ongoing, which should be a pointer to which of the theories that is useful.

There are also other models or "histories" - more constrained and ad hoc, not necessarily testable as much as a formulation of research strategies, et cetera.

Since I am partial I note that there is a recent paper that showed that only the vent environment can lead to chemiosmosis, the idea that originally tied cells and Hadean geophysics together. My - trying to be informed - guess is that "soup" is hereby doomed to fade into irrelevance.

Again being partial, astrobiology houses the more general work on life emergence. That pulls in cosmology, planetary physics and geophysics as well. Or even if you look elsewhere, you see geology et cetera in heavy participation.

If you are interested, here is a really interesting publication of cutting edge scientists in a somewhat formal, somewhat informal setting sharing, as best possible, their respective knowledge with each other: https://astrobiology.nasa.gov/semin.../2013/5/20/hadean-earth-moon-system-workshop/ .

If you go to talk #9, "Looking back by looking up: how exoplanets might inform us about surface conditions and abiogenesis on early Earth
Eric Gaidos, School of Ocean and Earth Science and Technology, University of Hawai’i at Manoa", Gaidos argues for a 100 Myrs gap or so between our local knowledge of planetary formation (which is very good due to the large effect that Jupiter/Saturn behavior had) and our first geology knowledge (see the other talks). That is a gap that can perhaps only be filled by looking at planetary formation elsewhere, and the knowledge goes into setting the scene for the meager geology we have.

[Say, we now know there was a hydrosphere from > 4.3 billion years ago (see the talks). But was it habitable or locked beneath a high pressure, high temperature steam atmosphere, the latter possible though not very likely - and in the latter case Timetree would not be put in tension: http://www.timetree.org/search/pairwise/2/2157? The consensus seems to be it was habitable, but it would be good to have more evidence.

And as the talks on zircons note: there are now many thousands Hadean such (plus the Nuvvuagittuq rocks) with total absence of the usual impact shock traces seen in later periods. Where is the late bombardment!? Now we know our volatiles could, nay should, be mainly supplied before that period, so we have no longer any forcing constraint telling us Earth was subjected to late impactors - with or without volatiles - at the extent earlier envisioned. Rather the constraint is that nothing much happened, not much more volatiles came down late. Something mysterious is afoot - or the new Nice 2 planetary system formation theory with its much reduced late impactor flow has another positive test here.]

The upshot is that planetary and planetary system physicists hath their uses!
 
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Torbjorn_L said:
A very good question!

Alas, there is still no consensus. The field has been described as 50 years of modeling (100 if you count from Oparin), looking forward to 50 years of tests. (From around -00, IIRC; I am not sure I can pull out the reference at this time.)

But it now seems two possible, competing theories have emerged, "soup" and "vent" theories (also called protocell theory vs fuel cell theory). Those are - at least in principle - testable in toto, and it was exciting to see that this years Astrobiology 2015 conference included a session devoted to tests - astrobiology is now "normal science"! (Theories and tests.) I note that it seems only vent theory tests were ongoing, which should be a pointer to which of the theories that is useful.

There are also other models or "histories" - more constrained and ad hoc, not necessarily testable as much as a formulation of research strategies, et cetera.

Since I am partial I note that there is a recent paper that showed that only the vent environment can lead to chemiosmosis, the idea that originally tied cells and Hadean geophysics together. My - trying to be informed - guess is that "soup" is hereby doomed to fade into irrelevance.

Again being partial, astrobiology houses the more general work on life emergence. That pulls in cosmology, planetary physics and geophysics as well. Or even if you look elsewhere, you see geology et cetera in heavy participation.

If you are interested, here is a really interesting publication of cutting edge scientists in a somewhat formal, somewhat informal setting sharing, as best possible, their respective knowledge with each other: https://astrobiology.nasa.gov/semin.../2013/5/20/hadean-earth-moon-system-workshop/ .

If you go to talk #9, "Looking back by looking up: how exoplanets might inform us about surface conditions and abiogenesis on early Earth
Eric Gaidos, School of Ocean and Earth Science and Technology, University of Hawai’i at Manoa", Gaidos argues for a 100 Myrs gap or so between our local knowledge of planetary formation (which is very good due to the large effect that Jupiter/Saturn behavior had) and our first geology knowledge (see the other talks). That is a gap that can perhaps only be filled by looking at planetary formation elsewhere, and the knowledge goes into setting the scene for the meager geology we have.

[Say, we now know there was a hydrosphere from > 4.3 billion years ago (see the talks). But was it habitable or locked beneath a high pressure, high temperature steam atmosphere, the latter possible though not very likely - and in the latter case Timetree would not be put in tension: http://www.timetree.org/search/pairwise/2/2157? The consensus seems to be it was habitable, but it would be good to have more evidence.

And as the talks on zircons note: there are now many thousands Hadean such (plus the Nuvvuagittuq rocks) with total absence of the usual impact shock traces seen in later periods. Where is the late bombardment!? Now we know our volatiles could, nay should, be mainly supplied before that period, so we have no longer any forcing constraint telling us Earth was subjected to late impactors - with or without volatiles - at the extent earlier envisioned. Rather the constraint is that nothing much happened, not much more volatiles came down late. Something mysterious is afoot - or the new Nice 2 planetary system formation theory with its much reduced late impactor flow has another positive test here.]

The upshot is that planetary and planetary system physicists hath their uses!
Thanks you, Torbjorn_L. Was astrobiology once considered pseudoscience? Also, are you a biologist?
 

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