Messenger RNA (mRNA)

mRNA is the τ-categorical bridge object between the temporal store of the ω-germ code on τ¹ and the spatial expression machinery on T². It is the time-stamped, finite-half-life intermediate carrying a copy of the genome's selected genes onto the τ¹ × T² fibered product where the ribosome reads it.

Categorical invariant. Object on the fibered product τ¹ × T²; the codomain of transcription morphism φ_tr and domain of translation morphism φ_tl in the central-dogma composition (VI.P15).

Primary registry anchor: VI.D40

Supporting items: VI.D11, VI.D12

1. I.K0 — Universe Postulate
2. VI.D15 — Life Sector
3. VI.D12 — DecodeHorizon — DNA as the τ¹-resident ω-germ store
4. VI.D40 — BSD Motivic Structure — codon table read on the bridge
5. VI.D11 — DecodeTarget — protein as the T² spatial output

Biomarker: Single-stranded RNA copy of a coding gene; 5′ 7-methylguanosine cap (eukaryotes); poly-A tail (eukaryotes); spliced introns removed; codon sequence read by ribosome on the small subunit.

Measurable range: Half-life: bacterial mRNA ≈ 2-10 min; mammalian mRNA median ≈ 7-10 h, tail 0.5-24 h. Length: bacterial average ≈ 1 kb; mammalian average ≈ 2-3 kb (range 0.2-100 kb). Cellular abundance: 0.5-5 transcripts per gene per cell on average.

Observation method: RNA-seq (bulk and single-cell); Northern blot; in situ hybridization (smFISH); ribosome profiling (Ribo-seq); SLAM-seq for nascent vs mature mRNA.

Calibration anchor: LG-Y02-kinetic-pseudoscalar-channel

Anchor chain:

1. VI.L18 chirality channel
2. RNA D-ribose backbone fixed by K_χ
3. directional 5′→3′ reading frame on the chirality-fixed strand
4. mRNA as time-stamped τ¹ × T² bridge object

Manuscript reference: manuscript-sources/book-06/part04/ch27-genetic-code.tex

Status: Planned

Related glossary entries

• LG-I01-genetic-code Genetic Code
• LG-I02-codon Codon
• LG-Y02-kinetic-pseudoscalar-channel Kinetic Pseudoscalar Channel

Referenced by

• LG-I05-trna Transfer RNA (tRNA)