Genetics & Biology · The Living Address · Paper 14 of 23

Lambda Phage Regulatory Circuitry: The Bistable Switch

The Switch That Remembers

The switch that remembers · CI vs Cro · cooperative binding · RecA induction · the cos ends

Stephen Daubney · The Daubney Foundation

bistable switch at ORCI holds lysogeny · Cro drives lysisstable yet induciblecos = 12-base ends

The biology

Lambda phage has two modes: lytic (make ~100 copies and burst the cell) or lysogenic (integrate quietly and pass to all descendants). The choice is a bistable switch at the OR operator: the CI repressor binds cooperatively, regulates its own synthesis, and holds lysogeny; Cro binds the same operators in the opposite order and drives lysis. Lysogeny is stable for many generations yet inducible — DNA damage activates RecA, which triggers cleavage of CI and flips the switch.

A switch that holds a memory

Here the switch remembers: once thrown to lysogeny it stays, through hundreds of divisions, because CI keeps making CI — a self-sustaining state of the address, held stable until a signal (damage, via RecA) flips it. This is memory written into a coordinate: not a passive mark but an actively maintained reading, the field holding one interpretation of the address until the conditions call for the other. The 12-base complementary cos ends close the linear DNA into a circle in the cell.

THE READING
A bistable switch is a maintained reading of the address — a memory held by self-regulation, stable across generations yet flipped by a signal. The field remembers which state it is in.

Where this departs from current science

Current science saysThe Force of Time says
The lysis/lysogeny switch is a gene-regulatory bistability.It is a maintained reading of the address — a memory the field holds until a signal flips it.
Induction is CI cleavage by activated RecA.It is the signal that flips a remembered coordinate from one stable reading to the other.

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The same single substance — time — writes the address of a cell, the wavelength of a spectral line, and the orbit of a planet. If this stirred your curiosity, the whole weave is waiting.

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