At a glance
DKO stands for Diacetyl Knock Out
| What it does |
Expresses ALDC inside the yeast cell, blocking diacetyl where it starts.
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Why it matters
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Skip the diacetyl rest, turn tanks faster, and shut down the diacetyl produced by hop creep.
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Best For
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Heavily hopped beers prone to hop creep, lagers, and any brewery optimizing tank time and consistency.
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Stability
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Holds across generations. No buying exogenous ALDC every batch.
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The tech
How does DKO work?
DKO gives a strain the ability to express the ALDC (alpha-acetolactate decarboxylase) enzyme inside the cell, which converts alpha-acetolactate, the precursor to diacetyl, straight into acetoin, a flavorless compound. In short, its a tool to create cleaner beer without waiting in the cellar.
Function
How ALDC affect diacetyl?
Diacetyl forms outside the cell. Yeast excretes alpha-acetolactate, it oxidizes to diacetyl in the beer, and then the yeast has to reabsorb and reduce it. You can dose ALDC enzyme to head this off, but added enzyme is pH-sensitive (it fades as fermentation drops below pH 5) and proactive only, it can't clean up diacetyl that has already formed, which is exactly where hop creep bites. DKO keeps the reaction inside the cell: ALDC converts alpha-acetolactate to acetoin before the cell excretes it, and it keeps working through late fermentation, when dry-hop enzymes free fresh sugar and restart the whole cycle. It is also genetically stable across generations, so the benefit doesn't reset each batch.
The strains
Choose your own adventure
At the moment, we have 10 strains with DKO technology to choose from. Do you see your house strain in there?
| West Coast+ | "Chico" in its best form. DKO and Lumina deliver clean, crystal-clear beer without lingering diacetyl or haze. |
| Point Loma+ | DKO and Lumina address cellar hangups directly, making this a strong house strain candidate, particularly for heavy clean IPA producers. |
| British V+ | The ALDC-expressing gold standard for hazies. |
| DIPA+ | All the reliability of DIPA, none of the diacetyl spikes during hop creep. |
| Extra Special+ | Drops remarkably clear, leaving behind nuanced esters with a dash of residual sweetness. |
| Kolsch II+ | Snappy, hop-forward, and clear, with DKO keeping diacetyl out of the picture. |
| German Lager+ | Sports a famously versatile malty profile with slight esters at a wide fermentation range. |
| Bayern Lager+ | The famous profile lays the groundwork for traditional lagers such as helles, kellerbiers, and pilsners. |
| Little DIPA+ | A Thiolized version of the "Conan" strain without the diacetyl hangup |
| Vossa Nova | A Thiolized version of Voss Kveik, known for reliable haze and tangy citrus notes. |
p.s. more incoming...
The data
Read the sensory
Three real fermentations, three styles, one result: the parent strains exceed the diacetyl sensory threshold, the DKO versions don't.
Even without dry hopping, diacetyl still forms as yeast becomes stressed and tired late in fermentation. Extra Special climbs near 700 µg/L early and slowly works it back down; Extra Special+ stays flat near zero the whole way.
DKO yeast are more effective against dry-hop-induced diacetyl. With a dry hop in play, West Coast Ale I spikes well past the sensory threshold on day 8, while West Coast Ale I+ holds beneath it through day 14.
In the lager, diacetyl from the parent strain peaks near 1,000 ppb mid-fermentation and requires a rest. German Lager I+ never crosses the threshold.
Next Steps
Try a simpler path
We suggest finding the strains you're familiar with and utilizing the engineered version with DKO. It's the first step into modernizing production and directly addressing both quality and operational blockers.
Stay bubbling,
The Omega team