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How are xeno-nucleic acids different from ordinary DNA?
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synthetic biology
A scanning electron micrograph of cells of Mycoplasma mycoides JCVI-syn1.0—a synthetic bacterium.
In the field of synthetic biology, xeno-nucleic acids (XNAs) differ from ordinary DNA primarily in their structural composition. While XNAs retain the natural base pairs found in DNA, they possess a backbone constructed from sugars other than deoxyribose.1
This structural difference has significant implications for how these molecules interact with biological machinery:
- Replication: Unlike ordinary DNA, XNAs cannot be replicated by the enzyme DNA polymerase, which is responsible for catalyzing natural DNA synthesis.1
- Enzymatic Requirements: Because they are not compatible with standard biological enzymes, the replication and transcription of XNAs require the use of specially engineered enzymes.1
These synthetic molecules represent a departure from the standard genetic framework, requiring researchers to develop unique tools to facilitate their synthesis and function.1