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arXiv · 2507.01139

The Genetic Code Paradox: Extreme Conservation Despite Demonstrated Flexibility

Marc Bara Iniesta
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Abstract

The universal genetic code presents a fundamental paradox in molecular biology. Recent advances in synthetic biology have demonstrated that the code is remarkably flexible--organisms can survive with 61 codons instead of 64, natural variants have reassigned codons 38+ times, and fitness costs of recoding stem primarily from secondary mutations rather than code changes themselves. Yet despite billions of years of evolution and this proven flexibility, approximately 99% of life maintains an identical 64-codon genetic code. This extreme conservation cannot be fully explained by current evolutionary theory, which predicts far more variation given the demonstrated viability of alternatives. I propose that this paradox--evolutionary flexibility coupled with mysterious conservation--reveals unrecognized constraints on biological information systems. This paper presents testable predictions to distinguish between competing explanations: extreme network effects, hidden optimization parameters, or potentially, computational architecture constraints that transcend standard evolutionary pressures.

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Marc Bara Iniesta. 2025-07-01. The Genetic Code Paradox: Extreme Conservation Despite Demonstrated Flexibility. https://arxiv.org/abs/2507.01139

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