Where did the code come from?

2.1

Nothing could have been selected for translation before translation existed. So how did it start?

The answer is a merger, not an invention.

Two RNA systems, each complete and selected on its own terms — a peptide-bond ribozyme as generator, charged acceptor stems as carrier — brought together by co-compartmentalisation. The code is the frozen interface contract of that encounter. The constraint that forces this shape: any account must not select for translation before translation exists to be selected for.

The field's own words, and why they gate the answer

Stated by the field itself, from three directions and three decades: Crick 1968 — the origin of the ribosomal mechanism "presents grave difficulties"; Nissen et al. 2000 — the steps to messenger-directed synthesis "are not yet obvious"; Wolf & Koonin 2007 — the selective forces "remain obscure," an objection "perhaps even more prohibitive" than ribozyme imperfection.

That's the constraint the merger account is built to satisfy: the peptidyl-transferase centre (PTC) is a generator that condenses activated amino acids into untemplated peptide, selected on its own for that; charged acceptor stems are a carrier holding a stable link between one amino acid and one sequence, selected on its own for that. Neither needs translation to already exist. The CCA terminus is the interface where they meet, and the code is read as the record of where they met — chemistry biases the outcome without determining it.

Published as Translation is a merger, not an invention, DOI 10.5281/zenodo.22008798.

→ Someone has been near this. Who, and does it survive them?

2.2

Isn't this Hartman & Smith 2019?

Partly, and they should be credited early and generously — but the mechanism is different, and the difference is the argument.

Hartman & Smith got there first on four things: operational-code priority in the acceptor arm, the thioester world supplying activated amino acids, CCA as the ancient interaction surface, and the code arising at a coupling event.

Where the accounts actually diverge

Their mechanism is coevolution — in their own framing, "it is the coevolution of the tRNA with the aaRSs that is at the heart of the origin." A coevolutionary account has the components adapting toward a coupling, which is selecting for translation before translation exists to be selected for — exactly the teleological trap Chain 2.1 was built to avoid. Their generator is peptide catalysis preceding nucleotides, and they present the paper as an alternative to the RNA world.

This account keeps both systems inside the RNA world: a ribozyme, and an event within it, not a coevolutionary drift toward a coupling neither side could anticipate. Naming the collision directly, in §1 rather than a footnote, turns the strongest available prior-art objection into evidence the paper was actually read.

→ If the merger froze the interface, what else did it freeze in the same moment?

2.3

Why is life one-handed, when the chemistry is only slightly biased?

Because the merger froze a choice the sugar had only biased.

Chirality is transduced, not determined — local chemical bias does not fix a global sign; a freezing event does. A peptide-bond generator with no stereochemical preference of its own passes handedness through from whichever carriers it's fed, and that bias was locked in at the same merger event proposed for the genetic code, not decided by chemistry alone.

The falsifiable corner

The sharpest testable consequence: glycine is achiral, so the chirality lock cannot predate amino acid number two — whichever amino acid was second into the system is where the freeze has to trace to, not before. A scaffold test using D- and L-charged minihelices is proposed to show product handedness tracking the carrier rather than the chemistry.

Published as Chirality is transduced, not determined, DOI 10.5281/zenodo.22012402.

→ Code, amino-acid handedness, backbone handedness — one freeze, or three?

2.4

Is the central dogma a law, or the scar of an accident?

The Catma is the process that froze the dogma.

Where the dogma is the rule once frozen, the Catma is the freezing itself — the specific event that collapsed code, amino-acid handedness and backbone handedness together. One clause is cut on non-negotiable grounds: the dogma does not describe the historical order RNA→protein→DNA. It prohibits transfer out of protein, is silent on historical order, and explicitly permits RNA→DNA — Crick published a 1970 paper for the specific purpose of saying so.

Two claims withdrawn here, publicly, in this paper's own claims table

Withdrawn Compositional assemblies as an early heritable carrier. Vasas et al. give the number: imposing a fitness gain on a target compositional assembly yields a relative selective advantage of 1.00715, because off-diagonal fitness-matrix elements exceed diagonal ones — an assembly is fed more by its neighbours than by its own offspring, so it can't hold identity long enough for selection to grip. They grant the generator half explicitly, so: drop the carrier, keep the generator — which sharpens the chain, because the merger isn't swapping carriers any more, it's supplying the first one to a generator that never had any.

Withdrawn The merger obliging an archive. Retracted as teleological. Environmental conditions, not internal needs, select for DNA. This correction came from Meow-Ludo. Both rows, with their full reasoning, are in /claims/.

Published as The Central Catma, DOI 10.5281/zenodo.22019657.

→ Was the freeze one single event — or a late, shallow lock (L versus D) riding on top of deeper choices that had already been made?

Nothing could have been selected for translation before translation existed. So how did it start?

Isn't this Hartman & Smith 2019?

Why is life one-handed, when the chemistry is only slightly biased?

Is the central dogma a law, or the scar of an accident?

Where this chain landed