Codons mapping to the same amino acid are functionally interchangeable

the verdict

REFUTED

the evidence says no

Recorded sources

0 sources for · 3 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Codons mapping to the same amino acid are not functionally interchangeable; synonymous codon choice significantly impacts translation kinetics, protein folding, and cellular fitness.

The analysis

The claim states that synonymous codons are functionally interchangeable. However, contemporary molecular biology and genomics literature directly refute this, showing that codon usage bias (CUB) profoundly affects translation speed, mRNA stability, co-translational protein folding, and organismal fitness. Papers [2], [3], and [5] provide robust evidence that altering synonymous codons leads to measurable functional and structural consequences, thus disproving their interchangeability.

Evidence against · 3

A slight mismatch between a gene's codon usage and the cellular tRNA supply is beneficial.

Recorded source metadata

Chen F, Liu Y, Zhou Z, Liao J, Fan X, Huang Y, Chen Y, Chen J, Yang JR. A slight mismatch between a gene's codon usage and the cellular tRNA supply is beneficial.. 2026. https://doi.org/10.1038/s41467-026-69643-2

Demonstrates that synonymous codons are not functionally interchangeable because a slight mismatch with tRNA supply affects bacterial growth rates and fitness.

Source citation format

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More against · 2

Mapping the inter- and intra-genic codon-usage landscape in <i>Homo sapiens</i>.

Recorded source metadata

Arshad M, Uchmanowicz M, Rana V, Trost B, Scherer SW, Rafiq MA. Mapping the inter- and intra-genic codon-usage landscape in <i>Homo sapiens</i>.. 2026. https://doi.org/10.1093/nargab/lqag024

Shows that codon usage bias acts as a functional constraint influencing mRNA stability, translation kinetics, and protein folding rather than mere silent variation.

Source citation format

Native CFTR codon bias controls translation rate to balance off-pathway aggregation and channel function by conformational imprinting.

Recorded source metadata

Yoon JS, Li H, Kim Y, Shishido H, Sheppard DN, Lee MG, Skach WR. Native CFTR codon bias controls translation rate to balance off-pathway aggregation and channel function by conformational imprinting.. 2025. https://doi.org/10.1038/s41598-025-31274-w

Establishes that native codon usage dictates translation rates via pauses that are critical for proper protein folding, meaning synonymous substitutions alter protein structure and function.

Source citation format

The paper trail · every fact has a biography

first checked01 Aug 2026

judged → REFUTED · 301 Aug 2026

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