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<p>Traditional canon in biology holds that there is a single, universal genetic code. It is common to see the continued use of the language “universal” even in the face of a number of alternative codes found in microbes, mitochondria, chloroplasts, and other plastids. This usage is often justified by appeal to the relative insignificance of nonstandard genetic codes. In this article, I argue that molecular biology often misuses relative significance as a means to resist thinking more deeply about when and how it is justifiable and productive to conceptualize the genetic code as a “universal” feature of the natural world. When used to minimize the challenges a phenomenon represents to popular theories, relative significance debates interfere with the pursuit of more fruitful research questions. This is not to say that all appeals to relative significance are unjustified and unproductive. Following Kovaka (<CitationRef CitationID="CR50">2021</CitationRef>) and Deaven (<CitationRef CitationID="CR51">2023</CitationRef>), I outline a variety of important relative significance questions that are worth pursuing. Instead of conceptualizing the genetic code as “universal”, I offer a more promising way of thinking about the relative significance of nonstandard genetic codes. For the purposes of molecular biology, I propose conceptualizing a plurality of genetic codes with varying degrees of invariance (Woodward <CitationRef CitationID="CR52">2003</CitationRef>). Doing so has the potential to facilitate greater understanding of genetic code structure and evolution (Potochnik <CitationRef CitationID="CR28">2017</CitationRef>) and provide the conceptual framework necessary for justifying biological practices.</p>

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From the Elephant to Butyric Acid Bacterium—It Is [Not] All the Same! How the Genetic Code Is Not Universal

  • 期刊论文

  • 发表日期：

    2026年3月23日

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  • Janella K. Baxter

摘要

Traditional canon in biology holds that there is a single, universal genetic code. It is common to see the continued use of the language “universal” even in the face of a number of alternative codes found in microbes, mitochondria, chloroplasts, and other plastids. This usage is often justified by appeal to the relative insignificance of nonstandard genetic codes. In this article, I argue that molecular biology often misuses relative significance as a means to resist thinking more deeply about when and how it is justifiable and productive to conceptualize the genetic code as a “universal” feature of the natural world. When used to minimize the challenges a phenomenon represents to popular theories, relative significance debates interfere with the pursuit of more fruitful research questions. This is not to say that all appeals to relative significance are unjustified and unproductive. Following Kovaka (2021) and Deaven (2023), I outline a variety of important relative significance questions that are worth pursuing. Instead of conceptualizing the genetic code as “universal”, I offer a more promising way of thinking about the relative significance of nonstandard genetic codes. For the purposes of molecular biology, I propose conceptualizing a plurality of genetic codes with varying degrees of invariance (Woodward 2003). Doing so has the potential to facilitate greater understanding of genetic code structure and evolution (Potochnik 2017) and provide the conceptual framework necessary for justifying biological practices.