Gene function discovery using
the Onyx platform

1
Full gene mapping at the native locus

Until now, the ability to comprehensively study gene sequence variants at the native locus has been unavailable to researchers. That all changes with the introduction of the Onyx platform. With Onyx, every residue of every protein of interest can be systematically probed and evaluated in detail like never before.

2
Full site-saturation mutagenesis of four essential E. coli genes

In collaboration with one of our Early Access customers, we used Onyx technology to design and build complete scanning site-saturation mutagenesis libraries on four E. coli cell envelope biosynthesis genes.

By methodically substituting every wild-type codon with one encoding each of the other 19 amino acids along the full length of each gene, we rapidly generated a library of approximately 23,000 members for a complete mapping of all possible single amino acid variants of the four proteins of interest. And don’t forget, all edits were made on the genes at their native loci, in the context of wild-type gene copy number and regulatory control.

Site saturation
Site-saturation mutagenesis identified essential residues around the active site of LpxC
3
Functional mapping of the essential residues of essential genes

For this application — saturation mutagenesis of essential genes — any edit resulting in compromised cell viability would fail to appear in the population at the conclusion of a pooled library cultivation. With deep sequencing of the four targeted loci, this is exactly what we observed, in exquisitely high resolution! Known catalytic and substrate-binding residues proved especially sensitive to this readout and served to validate the experiment.

Even more exciting was the discovery of a set of additional positions in these four proteins not previously identified as functionally essential.

Watch the webinar to learn how the Onyx platform can be used to probe essentiality of residues at different positions in the protein, as well as amino acid substitution tolerance.
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Resources & Support

Want to learn more about the Onxy platform and what we’ve been up to? Check out our latest videos, webinars, and presentations and get answers to our FAQs on the Resource & Support page.