Why Self-Replicating RNA Cannot Specify a Living Cell

Dan Mason, Ph.D. The Mason Brief 2026

I want to walk you through a thought experiment that has occupied me for several months. It concerns the origin of life, but not in the way most people discuss it. The usual debate is about whether life could have arisen naturally or whether it required a Creator. That debate has its place. But before we can answer it, we need to understand what the question actually is.

The question is not: "How did molecules start copying themselves?"

The question is: "How did chemistry come under the rule of a code?"

These are not the same question. And once you see the difference, the origin-of-life problem looks very different than it does in most popular accounts.

The Problem in Plain Terms

A living cell is not just a bag of reacting chemicals. It is a system in which a stored description (the genome) is read by molecular machinery (the ribosome and associated components) to construct proteins according to an arbitrary code (the genetic code). The description is also copied and passed to offspring.

This architecture has a specific structure: A description that is preserved across time (the genome) A constructor that reads the description and builds the product (the ribosome) A copier that duplicates the description without reading it (DNA polymerase) A code that maps the description to the product (the genetic code)

The description is what I call "rate-independent." It does not change with how fast the cell metabolizes. The genome specifies the same proteins whether the cell is at 30°C or 37°C. The construction process is "rate-dependent." It happens in real time, governed by chemical kinetics and energy gradients.

Life, then, is the meeting point of two domains: static symbolic memory and dynamic physical chemistry. The genome is the script. The cell is the play. The ribosome is the director that reads the script and tells the actors what to do.

This is not a metaphor. It is the actual architecture of every living cell on Earth.

The RNA World Hypothesis

The standard naturalistic story for the origin of life goes something like this: Before there were cells with DNA and proteins, there were self-replicating RNA molecules. RNA can both store information (like DNA) and catalyze chemical reactions (like proteins). So RNA could have been the "first living molecule," capable of copying itself without the help of proteins.

This is the RNA world hypothesis. It is taught in most biology textbooks and is the dominant framework in origin-of-life research.

I do not dispute that RNA can catalyze reactions. I do not dispute that RNA can serve as a template for copying. I do not dispute that researchers like Jack Szostak and Gerald Joyce have made impressive progress in creating RNA molecules that can copy themselves or each other in controlled laboratory conditions.

What I dispute is that any of this addresses the actual problem.

The Functional Gap

Here is the issue. In self-replicating RNA, the Sign and the Tool are the same molecule.

Let me explain what I mean by that.

In a living cell, the DNA sequence is a sign. It represents something other than itself. The sequence "UUU" does not physically resemble phenylalanine. There is no chemical reason why "UUU" should code for phenylalanine rather than some other amino acid. The association is arbitrary. It is maintained by adapter molecules (tRNA) and enzymes (aminoacyl-tRNA synthetases) that enforce the code.

This is what I call the "functional gap." The symbol represents something other than its own chemical properties. There is a distance between the sign and what it signifies. That distance is bridged by an interpreter.

In self-replicating RNA, there is no functional gap. The RNA sequence does not represent something else. It physically instantiates itself through base-pairing. A pairs with U. G pairs with C. The "information" in the template is not being read by an interpreter. It is being chemically copied through direct molecular complementarity.

This is not symbolic control. This is chemistry.

The Description/Constructor Split

John von Neumann, one of the greatest mathematicians of the twentieth century, worked out the logic of self-reproducing machines in the late 1940s. He was not thinking about biology. He was thinking about automata, about whether a machine could build a copy of itself.

He realized that any self-reproducing machine capable of growing in complexity must have a specific architecture. The machine must contain a description of itself. That description must be used in two ways: As instructions: The description is read by a constructor that builds the machine. As data: The description is copied and passed to the offspring.

If the description is only used as instructions, the machine cannot copy it. If the description is only copied, the machine cannot build anything. The dual use is essential.

Von Neumann worked this out years before Watson and Crick discovered the structure of DNA. When the structure was discovered, biologists realized that DNA does exactly what von Neumann described. The genome is transcribed (read as instructions) and replicated (copied as data). The dual use is real.

In self-replicating RNA, there is no such split. The RNA molecule is both the description and the constructor. It copies itself. There is no separate machinery that reads the description to build something else.

This is why self-replicating RNA cannot grow in complexity. It hits what von Neumann called a "complexity ceiling." It can replicate its own form, but it cannot specify a different form. It cannot direct the construction of a membrane, a metabolic pathway, or a division apparatus. It can only make more of itself.

The Arbitrary Code

Francis Crick, co-discoverer of DNA's structure, articulated what he called the "Central Dogma" of molecular biology. In his 1970 paper, he defined it precisely: "sequential information" flows from nucleic acid to nucleic acid or from nucleic acid to protein, but not from protein to nucleic acid.

The keyword is "sequential." The information is in the order of the bases. And the mapping from that order to the amino acid sequence of proteins is arbitrary. There is no chemical reason why UUU codes for phenylalanine. The tRNA adapters and the synthetase enzymes enforce the code.

This arbitrariness is essential. It is what allows the same physical substrate (nucleotides) to specify an unlimited variety of functional products (proteins). If the mapping were chemically determined, the system would be locked into a single outcome. The arbitrary code gives the system its creative power.

In self-replicating RNA, there is no arbitrary code. Replication uses base-pairing complementarity. A pairs with U because of chemical affinity. G pairs with C because of chemical affinity. This is not a code. This is chemistry.

What the Functional Stack Shows

I have traced an intellectual lineage through four thinkers: C.S. Peirce (1839-1914): Established that sign relations are triadic. A sign, an object, and an interpretant. You cannot reduce meaning to physics. Alan Turing (1912-1954): Demonstrated that a linear tape of symbols can govern any computable process, regardless of the speed of execution. John von Neumann (1903-1957): Clarified that self-reproducing machines require a stored description used both as instructions and as copied data. Francis Crick (1916-2004): Established the molecular basis of directional sequence information flow and the arbitrary genetic code.

A fifth thinker, Howard Pattee (1926-2024), later synthesized these into the explicit distinction between "rate-independent symbols" and "rate-dependent dynamics." He called the boundary between them the "epistemic cut."

Taken together, these thinkers can be read as a retrospective functional stack. Sign mediation, sequential symbolic procedure, stored descriptive control, and directional sequence information flow converge on the problem of how rate-independent memory comes to govern rate-dependent construction in living systems.

I am not claiming that Peirce, Turing, von Neumann, and Crick themselves jointly taught my RNA-world critique. They did not. That critique is my synthesis, aided especially by Pattee's later framework. But their work supplies the conceptual tools for making the critique.

The Forensic Evaluation

I have applied this functional stack to the best modern RNA-world experiments. Here is what I find:

Szostak Lab: Pioneered in vitro selection of RNA catalysts from random pools. Achieved RNA molecules capable of ligation or limited polymerization. On the functional-stack reading, these systems do not implement the description/constructor split or the arbitrary code. The Sign and the Tool are conflated.

Joyce Lab: Produced cross-catalytic RNA enzymes (2009) and improved polymerase ribozymes (2016, 2020). More recently, a 45-nucleotide ribozyme (QT45) has achieved 94.1% per-nucleotide fidelity and can produce copies of itself from defined substrates, though with very low yields (about 0.2% over 72 days under specific conditions).

This is real progress. I do not dismiss it. But on the functional-stack reading, it does not close the gap to integrated coded control. The Sign and the Tool remain conflated. There is no separate interpreter. There is no arbitrary code. The system replicates itself but does not specify anything else.

The Gap Is Not a Gap of Degree

Here is the point I want to emphasize. The gap between self-replicating RNA and a living cell is not a gap of degree. It is a gap of a different kind.

The cell has a description that is separate from the constructor. The description is read by an interpreter. The mapping from description to product is arbitrary. The description is protected from metabolic noise and passed to offspring.

Self-replicating RNA has none of these features. It copies itself through direct chemical complementarity. There is no interpreter. There is no code. There is no separation.

You cannot get from one to the other by adding more chemistry. You need a different architecture. You need a functional stack.

What This Means for the Origin Question

I am a Christian. I believe that God created life. But I do not make that claim here on theological grounds. I make it on architectural grounds.

The origin-of-life problem, as framed by this analysis, is not merely, "How did molecules start replicating?"

The problem is: "How did an Integrated Sign System emerge, a system in which quiescent symbols specify dynamic construction via an arbitrary code?"

No known prebiotic chemistry produces this architecture. The RNA world hypothesis addresses replication but not specification. Template-directed polymerization is chemistry, not code.

Whether the gap can be closed by natural processes remains an open question. I am not claiming that science has proven it cannot. I am claiming that the gap is real, that it is architectural, and that most popular accounts of the origin of life do not even acknowledge it.

The question is not, "Can molecules copy themselves?"

The question is, "How did molecules become messages?"

That is the question von Neumann asked. That is the question Pattee asked. That is the question I am asking.

And I do not see how chemistry alone can answer it.

A Word to My Christian Readers

I am writing this for The Mason Brief, a Christian publication. But I have kept the argument secular and empirical. I have not appealed to Scripture. I have not invoked miracles. I have traced the logic of what a living system requires and shown that self-replicating RNA does not meet that requirement.

This is Track 1 reasoning. It is the kind of argument you could make in a secular academic journal. I have, in fact, prepared a ResearchGate version of this paper under my academic byline (Charles Mason, Ph.D.) that makes the same argument without any theological framing.

But for you, my Christian readers, I will say plainly what the secular version does not say:

The architecture of life points beyond chemistry.

The genetic code is arbitrary. The physics of the molecules does not determine it. It is a mapping that a system of adapters and enzymes must enforce. Where did that mapping come from? Not from chemistry. Chemistry gives you complementarity, not codes.

The description/constructor split is logically necessary for self-reproduction with evolutionary potential. Von Neumann proved this. But how does such a split arise from undirected chemistry? It does not arise from autocatalysis. It does not arise from template-directed polymerization. It requires a different kind of cause.

I do not say this to shut down inquiry. I say it because the inquiry, properly conducted, leads to this question. And the question is not answered by waving hands at "self-organization" or "emergence."

The origin of life is the origin of the Code. And codes do not write themselves.

Conclusion

The central origin-of-life problem is not merely replication but the emergence of symbolic architecture capable of self-specification.

Self-replicating RNA does not solve this problem. It achieves chemical autocatalysis, not coded self-specification. The Sign and the Tool are conflated. There is no functional gap. There is no arbitrary code. There is no description/constructor split.

The functional stack, from Peirce through Turing, von Neumann, Crick, and Pattee, identifies the architectural requirements that any origin-of-life model must address: A rate-independent description A rate-dependent constructor that reads the description A copier that duplicates the description without interpreting it An arbitrary code mapping description to a product A functional gap where the symbol represents something other than its own chemistry

No known prebiotic chemistry meets these requirements. The gap between replicating molecules and self-specifying cells remains unbridged.

This is not a theological argument. It is an architectural argument. But for those with ears to hear, the architecture speaks.

Dan Mason, Ph.D. The Mason Brief 2026

Notes on Sources

The functional stack draws on: Peirce's semiotic theory (triadic sign relations), as developed in The Essential Peirce and Collected Papers Turing's formal model of computation, "On Computable Numbers" (1936), Von Neumann's automata theory, Theory of Self-Reproducing Automata (1966), Crick's sequence hypothesis and Central Dogma, "On Protein Synthesis" (1958) and "Central Dogma of Molecular Biology" (1970), Pattee's biosemiotic synthesis, "The Physics of Symbols: Bridging the Epistemic Cut" (2001)

The RNA-world case studies draw on Bartel and Szostak (1993), "Isolation of New Ribozymes from a Large Pool of Random Sequences." Lincoln and Joyce (2009), "Self-Sustained Replication of an RNA Enzyme." Horning and Joyce (2016), "Amplification of RNA by an RNA Polymerase Ribozyme." Recent 2025-2026 reports on QT45 ribozyme fidelity and self-copying yields

The modern biosemiotic application of Peirce's triad to molecular biology (DNA = Sign, Protein = Object, Ribosome = Interpretant) is an extension by later scholars, not Peirce's own claim. The biological application of Turing's tape model is similarly an extension. Von Neumann clarified the architecture but did not solve the origin-of-life problem. Crick established the molecular framework but did not articulate the full symbolic-control thesis developed here. The synthesis is mine, aided by Pattee.

This article is part of The Mason Brief, a Substack publication exploring origins science, public policy, and Christian apologetics. The academic version of this argument, without theological framing, is available on ResearchGate under the byline Charles Mason, Ph.D.