What Is NGS Library Normalization, and Why Is It Important?

When it comesto NGS library prep, there’s one step that can make or break your sequencingrun: NGS library normalization. It’s the process that ensures every sample inyour sequencing pool gets its fair share of reads — no more, no less. As YannJouvenot, Director of Product at n6, puts it:

“NGS librarynormalization is the step in the process where you ensure that all thelibraries that are going to be sequenced are at equivalent levels. If you havesome high abundance libraries and some very sparse ones, you’re going to have ahuge imbalance… you’re really not going to have a good way to compare thedata.”

With modernsequencers capable of churning out billions of reads, the stakes are higherthan ever. If your libraries aren’t balanced, you’ll waste sequencing power andrisk missing the data you actually need.

The Traditional NGS Normalization Workflow

Let’s face it,traditional NGS library normalization is a pain. The steps involved usuallylook like this:

1. Quantify yourDNA/RNA samples
2. Normalize:Adjust the concentration, so they’re similar, or batch samples of similarconcentrations
3. Amplify thesamples at a number of cycles that is good enough for the average, or lowestsample concentration
4. Quantify yoursamples again
5. Normalizeagain, so that you can batch your samples on fewer sequencing runs

Labs spendhours purifying, quantifying (hello, qPCR machine and automatedelectrophoresis), and individually adjusting every sample. It’s a workflowthat’s as varied as the scientists running it — and just as prone to error.

“Currentmethods involve individual purification, quantification, and normalization foreach library, which can be lab-dependent and time-consuming. These additionalsteps increase costs in terms of reagents, time, and analysis.”

Some labs even run pilot sequencing runs just to testif their library normalization worked before committing to a full-scale run.Smart? Yes. Efficient? Not so much. You’re probably thinking...

Is there a Way to Automate NGS Normalization?

There didn’tused to be - Enter iconPCR, a next-generation DNA amplification platform forNGS that reimagines the amplification step of NGS library prep. Instead oftreating all wells the same, iconPCR features a PCR thermocycler withindividually controlled wells, each with its own heating element and probe.

“We’vecompletely deconstructed the concept of the thermocycler. Each well has its ownthermal element and probe. We control the cycling of each well independently.That’s what enabled AutoNorm™.”

Thisbreakthrough is what powers AutoNorm, iconPCR’s secret sauce for automated NGSlibrary preparation.

AutoNorm: Automated NGS Library Preparation & Normalization

So, how doesAutoNorm work? It’s as easy as setting your desired endpoint. iconPCR monitorsDNA synthesis in real time using an intercalating agent (like SYBR Green). Whena sample hits the threshold, that well stops cycling—no more, no less.

“AutoNormnormalizes NGS libraries by monitoring DNA synthesis and stopping PCR for eachwell once a specified condition is met. You just take equivalent amounts fromeach well, pool them, perform a single purification, and load the balancedlibrary onto a sequencer.”

The result?No more guessing, no more tedious quantification, and a single, streamlinedworkflow. Just pool, purify, and go.

The Goldilocks Principle: Why “JustRight” Library Amplification Beats “Good Enough” Every Time

NGS librarynormalization currently involves quite a few steps, is error-prone, and iscostly in both time and consumables. But more than that, over-amplified andunder-amplified NGS libraries take a hit in quality. By developing an automatednormalization solution using individually controlled wells and automated cyclecontrol, you can stop normalization — stop cycling — at the optimum number ofcycles for every sample, automatically.With AutoNorm, you can preventovercycling and undercycling in a way that manual workflows simply can’t match.

“If you askany scientist in the genomics field, overcycling is the killer. It’s the killerof diversity. It’s the killer of sensitivity. It’s the killer of quality data.Nobody wants to sequence duplicates. Nobody wants to have to remove chimeras.Nobody wants to have to sort through artifacts that would otherwise beavoided.”

That’s theheart of the Goldilocks principle in for NGS library preparation: not too much,not too little — just the right amount for every well, every time. It’s thedifference between “good enough” and “just right,” and it’s what makes iconPCRand AutoNorm a leap forward for anyone serious about NGS library prep — fromMetagenomics and Spatial Transcriptomics to the trickiest FFPE workflows. Whysettle for a workflow that’s merely working, when you can have one that’soptimized for quality, efficiency, and scientific confidence?

Applications for Auto-Normalization in NGS: From Metagenomics to FFPE, iconPCR Delivers

Earlyadopters are singing the praises of iconPCR and AutoNorm. Kerry Hair at PennState University reports the instrument is saving her at least 50% of costs onNGS library prep and that it’s been a revolution in her lab.

And for thoseworking with challenging samples — think FFPE workflows, low-concentration RNA,or high-diversity metagenomics — iconPCR is a game changer.

“For degradedor low-concentration samples, you just set a desired endpoint yield, and thesystem automatically determines the necessary cycles for each sample to reachthat threshold, removing the guesswork.”

Auto-Normalization Is the Future of NGS Library Prep

The future ishere. What’s next for PCR NGS workflows? Automation is the name of the game.Yann predicts:

“I trulybelieve iconPCR will become the norm for library preparation… It’s reallydesigned to save people time, reagents, and most importantly, to preserve thequality of the data.”

As protocolsadapt to this new generation of PCR systems, expect shorter, simpler, and morereliable NGS library prep — no matter your application, from SpatialTranscriptomics to Metagenomics.

Ready to Experience the Goldilocks Effect in Your Lab?

Discover howiconPCR and AutoNorm can transform your NGS library prep — making it easy,optimized, and streamlined. Reach out for a demo and see what “just right”really feels like.