Milestones at the Origin of Life

S{\o}ren Toxvaerd

REVIEW 4 major objections 7 minor 97 references

Milestones at the Origin of Life

T0 review · 4 major / 7 minor · reviewed 2026-08-11 · deepseek-v4-flash

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Pith's one-line read This paper argues that life's first milestone was the emergence of homochiral peptides, stabilized by protein secondary structure in low-water environments, and that their later racemization explains aging and mortality.

desk verdict A clearly written speculative proposal whose ordering of milestones rests on an unproven stereochemical assumption. read the letter →

arxiv 2412.14754 v2 pith:75JM2TVG submitted 2024-12-19 q-bio.PE astro-ph.EP

S{o}ren Toxvaerd This is my paper · ORCID

classification q-bio.PEastro-ph.EP

keywords homochiralitypeptidesabiogenesisracemizationproteinsecondarystructurewateractivityoriginoflifeaging

verification ladder T0 review T1 audit T2 compute T3 formal

The pith

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The reading

This paper argues that the first milestone in the origin of life was not the cell, metabolism, or genetics, but the emergence of homochiral peptides: protein chains built from only one mirror-image form of amino acids. The claim is that these chains became stable in a prebiotic aqueous environment with high ionic concentration and low water activity, where their secondary structures, the α-helix and β-sheet, were held together by intramolecular hydrogen bonds and thermodynamically favored through chiral discrimination. Once homochiral peptides existed, they could act as stereospecific enzymes, making possible a homochiral D-carbohydrate metabolism, then genetics, and finally cells with cell division in hot-spring settings. The paper also contends that the same instability that let homochirality emerge, racemization of amino acid units, is what makes peptides age in living cells and ultimately causes mortality. A sympathetic reader would care because this ordering turns the classic chicken-or-egg problem of life's origin into a concrete physicochemical sequence with testable consequences.

What carries the argument

The central mechanism is chiral discrimination in peptide secondary structure. An α-helix, following Pauling's structure, is stabilized by intramolecular hydrogen bonds between amide N–H and C=O groups, and only a homochiral chain of amino acid units can maintain the constant angular orientation needed to form the helix; a single unit flipping from L to D destroys the conformation. The thermodynamic condition is that the enthalpy gain from these intramolecular hydrogen bonds exceeds the entropy cost of ordering, which the paper argues holds at low water activity, for example in salty or concentrated prebiotic solutions, but not in pure water or in the cytosol, where competition from water–peptide hydrogen bonds destabilizes the structure. This same structure carries the argument in two directions: it explains how homochirality could arise spontaneously from a racemic amino acid pool, and it explains why homochiral peptides are inherently unstable in living cells, leading to racemization, aging, and death.

What would settle it

A direct in vitro experiment measuring the rate of racemization and loss of secondary structure in peptides as a function of water activity, carried out at elevated temperature to accelerate the slow kinetics, would settle the claim: if low-water-activity solutions racemize at rates comparable to pure water, or if the helix and β-sheet conformations are not maintained over the relevant timescale, the proposed ordering collapses.

Watch

Extended reading notes

Core claim

The central claim is that the spontaneous emergence of homochiral peptides in an aqueous prebiotic environment with low water activity was the decisive first milestone of abiogenesis, preceding metabolism, genetics, and cellular life. The author argues that exergonic, Frank-type polymerization of amino acids, combined with the thermodynamic condition of chiral discrimination, produces peptides whose α-helix and β-sheet secondary structures require homochirality; only all-L or all-D chains can form these hydrogen-bond-stabilized conformations. These structures are stable at low water activity but unstable at the high water activity inside living cytosol, so over time the peptide units racemize, and the loss of L-amino-acid order, especially at aspartic acid residues, is observed in aged cells and is implicated in aging and mortality. From this first milestone, the paper derives a sequence: homochiral enzymes enable a stereospecific glycolysis with homochiral D-carbohydrates, then genetics with D-ribose nucleic acids, and finally cells with cell division, placed roughly 4 billion years ago at the crust–Hadean-Ocean interface, with the crust as the site of the earlier milestones.

Load-bearing premise

The load-bearing premise is that peptide secondary structures stabilized by intramolecular hydrogen bonds are stable enough at low water activity to preserve homochirality over geological timescales, and that this stabilization, not some other chiral-selection mechanism, is what actually drove the emergence of homochirality.

Editorial extensions

If this is right

The order of prebiotic milestones is fixed: homochiral peptides first, then a homochiral D-carbohydrate metabolism, then genetics, and finally cells with cell division.
The site of the first three milestones is the Earth's crust, roughly 4 billion years ago, where abundant water and all needed chemical components were present under low-water-activity conditions.
The last milestone, cells with cell division, occurred in hot-spring environments at the interface between the crust and the Hadean Ocean, likely via active droplet formation and phase separation.
Mortality of living organisms is a direct consequence of the thermodynamic instability of homochiral peptides: racemization of amino acid residues such as aspartic acid in the cytosol damages proteins over time.
Carbohydrate homochirality was achieved differently from peptide homochirality, not by secondary structure but by stereospecific enzymes like hexokinase and ribokinase that drain the L-forms and feed only D-forms into glycolysis and nucleic acid synthesis.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

Editorial inference: If this ordering is correct, the search for prebiotic chemistry should focus on environments where water activity is reduced by solutes, because only low-water-activity conditions would preserve peptide secondary structure long enough for enzymes to evolve.
Editorial inference: The aging claim suggests a testable prediction: organisms engineered to maintain lower intracellular water activity, or to repair racemized aspartic acid, should show slowed protein aging, while conditions that raise water activity should accelerate it.
Editorial inference: The symmetry-breaking argument implies that the choice between an L-amino-acid/D-carbohydrate world and its mirror image was settled by metabolism and catabolism; whichever chiral world established itself first would consume the other, a mechanism that could be tested in numerical reaction-network models.

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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, and a circularity audit.

Desk Editor's Note

read the letter

Dear colleague,

The paper is a clearly written speculative synthesis, but its central ordering of milestones rests on an untested stereochemical assumption. The author argues that homochiral peptides emerged first, stabilized by secondary structure at low water activity, then metabolism and genetics, then cells, and that the same instability drives aging and mortality. That ordering is new and presents a concrete, falsifiable scenario. The paper does a real service by assembling the relevant literature on amino acid racemization, water activity, and protein structure, and by proposing an in vitro test in Section IV and footnote 43.

The soft spot is load-bearing. Low water activity may stabilize alpha-helices and beta-sheets, but that does not by itself preserve the chirality of the alpha-carbon. Racemization is an alpha-carbon deprotonation/reprotonation event; backbone hydrogen bonds do not automatically protect that center. The paper's own cited data show aspartic acid racemizing inside structured proteins, in cataract crystallins, collagen, and endospores (refs 29-33, 36). So the claim that low water activity preserves homochirality is not supported by the evidence presented; it is a hypothesis. The author concedes in footnote 43 that the stability claim can only be proved or disproved by experiment, which makes the first milestone unresolved. Additionally, Frank's mechanism for spontaneous symmetry breaking requires autocatalysis or mutual inhibition, and the paper does not identify which reactions provide it. And the mortality link overreaches: the paper itself says aging is multifactorial, so making homochiral instability a cause of mortality is too strong.

That said, this is not a careless paper. It is transparent about its speculative nature and offers a testable proposal. It deserves a serious referee, but the referee should expect the stereochemical gap to be addressed. I would not cite it as evidence for the ordering, though it is a useful entry point to the hypothesis. For a reading group, it could generate good discussion.

Kind regards.

Referee Report

4 major / 7 minor

Summary. This paper proposes an ordering of 'milestones' in abiogenesis: (1) the emergence of homochiral peptides; (2) the establishment of metabolism and genetics; and (3) the emergence of cells with cell division. The central claim is that the first milestone was the spontaneous (Frank-type) polymerization of amino acids in a prebiotic aqueous environment with high ionic strength and low water activity, in which α-helix and β-sheet secondary structures, stabilized by intramolecular hydrogen bonds, produce 'chiral discrimination' that both generates and preserves peptide homochirality. The paper further argues that homochirality is intrinsically unstable in the high-water-activity cytosol, and that the consequent racemization of peptide residues is a cause of aging and mortality of living organisms. Carbohydrate homochirality is claimed to have arisen later, through stereospecific enzymes (hexokinase, ribokinase) and catabolic removal of the 'wrong' enantiomer (§II.B.1–2), and cells are placed last because enzyme-guided cell polarity and division presuppose metabolism and genetics (§II.C). The paper closes by proposing an in vitro experiment (Section IV) to test the stability of peptide secondary structure and homochirality as a function of water activity.

Significance. If substantiated, the proposed ordering would give origin-of-life research a single falsifiable narrative connecting peptide homochirality, enzyme stereospecificity, and the observed L-amino-acid/D-carbohydrate dominance. The paper's strengths are that the central claim is genuinely testable (Section IV proposes a concrete in vitro experiment, and footnote 43 states the stability claim can be proved or disproved by such an experiment), and the 'who comes first and dominates will eat the other' catabolism argument in §II.B.2 is an original qualitative proposal for global handedness selection. The main weakness is that the key physicochemical premise—that α-helix/β-sheet structure at low water activity preserves α-carbon chirality over geological timescales—rests on the author's own simulations (refs [5,27,54]) and on cited evidence about protein structural stability rather than about racemization kinetics, so the first-milestone claim currently functions as an untested hypothesis rather than an established result.

major comments (4)

[II.A (footnote 43; refs 26–36)] The load-bearing premise that low water activity preserves peptide homochirality over the many millions of years needed before metabolism appears is not established by the evidence cited. The experimental references concern the structural stability of proteins [26] and the thermal resistance of bacteria [28,34], not the rate of α-carbon racemization. Racemization is a proton-exchange event at the α-carbon that does not require loss of backbone secondary structure, and the paper's own citations show aspartic acid racemizing inside structured proteins (αA-crystallin, collagen; [29,30,33]) and in endospores with reduced mobile-water content, where racemization constrains survival to roughly 10^5–10^6 years [35,36]. The paper therefore needs either a quantitative kinetic estimate showing that low water activity suppresses α-carbon racemization by orders of magnitude relative to the cytosolic condition, or new experimental data; footnote 43 concedes that the stability claim is unproven pending the in vitro experiment proposed in Section IV. Given that concession, the abstract's phrasing that the emergence of homochiral peptides 'can be established' overstates the current support.
[II.A (Frank polymerization)] The symmetry-breaking step is under-specified. Frank's mechanism requires autocatalysis or mutual (chiral) inhibition in the reaction network to amplify a fluctuation in enantiomeric excess, yet the paper does not identify which reactions in the proposed peptide network provide that nonlinearity, nor does it report the reaction Gibbs energy ΔGr(aq) for peptide-bond formation under the stated brine conditions; the quantitative basis is delegated to the author's own simulations (refs [5,27]) without derivation. Without a specified amplification step, the claim that homochirality 'can be established by spontaneous exergonic (Frank) polymerization' is an assertion rather than a consequence of the model described.
[Abstract; II.A.2] The causal claim that homochiral peptide instability 'causes mortality of living organisms' is not supported by the cited evidence and is internally inconsistent with the paper's own account in Section II.A.2, which states that aging is 'a much more complex process' involving other decays of vital mechanisms (refs [37,38]). The cited Fujii work [30] establishes D-Asp as a molecular index or correlate of aging, not as the cause of mortality. The abstract and the conclusion of Section II.A should be qualified to state that racemization contributes to protein aging, or the stronger claim must be supported by a quantitative argument that racemization is rate-limiting for organismal mortality.
[II.B.2] The explanation for the exclusive L-amino-acid/D-carbohydrate world creates an ordering tension within the paper's own milestone sequence. The text acknowledges that chiral discrimination yields statistically equal numbers of D- and L-helices, so global handedness is ultimately fixed by the metabolism ('Who came first and dominates will eat the other'), namely at milestone B1 rather than at milestone A. For the claim that homochiral peptides constitute the first milestone to be coherent, the paper should distinguish the local emergence of homochirality (milestone A) from the global selection of one handedness (milestone B1) and state which of the two is meant by the 'first milestone' in the abstract.

minor comments (7)

[II.A] The heading 'Emergence of homochirality and razemization of the units in proteins' misspells 'racemization' as 'razemization'.
[References] Reference [14] cites 'Biochin. Biophys. Acta'; the correct abbreviation is 'Biochim. Biophys. Acta.'
[References] Reference [56] lists the author as 'Westerner'; the correct name is Westheimer (F. H. Westheimer, 'Why Nature Chose Phosphates').
[References] References [60] and [61] appear to share the same DOI (10.1016/j.biomolbio.2023.04.005) and page range; if they are distinct articles, the DOI and pages for [61] must be corrected, and the DOI string in reference [65] also appears malformed.
[II.B, III, Declaration] Several typos should be corrected: 'Glysealdehyde' (Section II.B) should be 'glyceraldehyde', 'carbohydrides' (Section III) should be 'carbohydrates', and 'compeeting' in the Declaration of Interest Statement should be 'competing.'
[II.A.1] The sentence citing [28] asserts that reduced water activity 'explains that bacteria have an increased lifespan,' but reference [28] reports thermal resistance of Salmonella and Enterococcus faecium at reduced water activity, not lifespan; the inference should be rephrased or the reference corrected.
[II.A, Figure 1] The discussion of Pauling's Figure 1 as showing 'a peptide with all D-units of amino acids' would benefit from a brief clarification connecting the handedness of Pauling's original left-handed helix to the modern L/D convention (as in [65]), since the caption labels the left structure in the figure as the natural form.

Circularity Check

2 steps flagged · score 6.0 of 10

First-milestone claim rests on a self-referential loop: secondary structures are said both to produce and to require homochirality, and the low-water-activity stabilization is supported only by the author's own simulations.

self definitional [Section II.A, concluding paragraph after 'Aging of a living cell']
"The emergence of homochiral peptides in aqueous in vitro suspensions can be established by spontaneous exergonic (Frank) polymerization of amino acids in a prebiotic aqueous environment with high ionic concentration and a small water activity compared with the water activity in bacteria. The homochirality by chiral discrimination is achieved by the secondary α − helix and β − sheet structures that require homochirality [20, 43]."

The paper presents the secondary α-helix/β-sheet structure as the mechanism that produces homochirality ('achieved by'), while simultaneously stating that this same structure 'require[s] homochirality.' Earlier in the same section it says 'The α − helix structure of an all L-peptide is destroyed if an L-conformation changes to a D-conformation,' so the structure used to explain homochirality can exist only for an already homochiral chain. The origin of the first homochiral chain is therefore assumed rather than derived. Footnote [43] confirms that the underlying stability premise is an untested hypothesis ('This can be proved/disproved by in vitro experiment'), so the loop is not closed by independent evidence.
self citation load bearing [Section II.A.1, paragraph 'Proteins in the cells']
"Simulations of models for polypeptides in a solvent with different water activities show, that a decreasing activity of an aqueous solvent stabilizes the compact conformation of the peptide and it indicates that homochirality is obtained in an aqueous solution with a high ionic concentration or low water activity[5, 27]."

Both cited sources ([5] Toxvaerd 2023 and [27] Toxvaerd 2017) are the author's own prior articles, and the present paper does not reproduce or independently verify those simulations. This claim is the load-bearing bridge from 'low water activity stabilizes compact conformation' to 'homochirality is obtained,' which in turn supports the first-milestone ordering. Because the cited work is itself the source of the hypothesis rather than an external, machine-checked, or independently reproduced result, the central premise rests on a self-citation chain.

full rationale

The paper's broad ordering argument is not wholly circular: it draws on independent Frank-polymerization kinetics, Pauling's structural chemistry, external reviews of protein/water interactions, and observed aspartic-acid racemization in aging proteins. However, the first-milestone claim—that homochiral peptides emerged first via chiral discrimination in secondary structures at low water activity—contains a definitional loop. The same section states that α-helix/β-sheet structures require homochirality, since a D-substitution destroys the helix, and then concludes that homochirality is 'achieved by' these structures. This is an X-requires-Y combined with Y-produced-by-X pattern, so the origin of the first homochiral chain is assumed rather than derived. The low-water-activity stabilization that bridges from structure to chirality is supported by two self-citations ([5,27]) to the author's own simulations, without independent reproduction, while footnote [43] concedes the premise can only be proved or disproved by future in vitro experiment. The remaining milestones (metabolism, genetics, cells) are supported by independent external evidence and are not themselves circular. A score of 6 reflects partial circularity concentrated in the central first-milestone derivation.

Assumptions & free parameters 0 free parameters · 5 assumptions · 0 invented entities

No free parameters or invented entities are introduced. The central claim rests on several domain assumptions about prebiotic chemistry and the stabilizing role of low water activity, the latter supported largely by the author's own previous simulation studies.

assumptions (5)

domain assumption Life originated on Earth (or Mars) via spontaneous exergonic reactions from prebiotic molecules.
The paper assumes abiogenesis occurred before 3.5 Gyr ago (Section I), and treats the emergence of biomolecules as a network of spontaneous reactions.
domain assumption Homochirality is a necessary precondition for life.
Stated in Section II.A: 'Without stereospecificity, no life is like ours.'
domain assumption The secondary structures (α-helix, β-sheet) of peptides are the mechanism that selects and stabilizes homochirality.
Invoked in Section II.A, citing Pauling (ref [20]) and the thermodynamic condition from the author's prior work (refs [5,27]). This is a physical assumption about the sufficiency of secondary-structure stability.
domain assumption Low water activity (high ionic strength) stabilizes peptide secondary structures compared to cytosol.
The paper argues this in Section II.A, citing refs [26,28,35] and the author's simulations [5,27], but it is not established for geological timescales.
ad hoc to paper The order of milestones is constrained by the need for homochiral enzymes before stereospecific metabolism and genetics.
This is the paper's thesis, argued qualitatively in Sections II.B1 and II.B2 rather than derived from an independent model.

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Cite this review

Pith. "Pith review of Milestones at the Origin of Life." pith.science (2026). https://pith.science/paper/75JM2TVG

@misc{pith2026241214754,
  author       = {Pith},
  title        = {Pith review of: Milestones at the Origin of Life},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/75JM2TVG}},
  note         = {Machine review of arXiv:2412.14754}
}

abstract

Living organisms have some common structures, chemical reactions and molecular structures. The organisms consist of cells with cell division, they have homochirality of protein and carbohydrate units, and metabolism, and genetics, and they are mortal. The molecular structures and chemical reactions underlying these features are common from the simplest bacteria to human beings. The origin of life is evolutionary with the emergence of a network of spontaneous biochemical reactions, and the evolution has taken place over a very long time. The evolution contains, however some "landmarks" and bottlenecks, which in a revolutionary manner directed the evolution, and the article tries to establish the order of these events. The article advocates that a possible order in the emergence of life is that the first milestone in prebiotic evolution is at the emergence of homochirality in proteins. The homochirality of peptides is, however, with instability and racemization which causes aging of the peptides and mortality. The metabolism and genetics are established through homochiral enzymes in the Earth's crust for $\approx$ 4 Gyr ago. Finally, the cells with cell division are established in the Hot Springs environment at the interface between the crust and the Hadean Ocean.

Figures

Figures reproduced from arXiv: 2412.14754 by the authors.

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