Oligo Pool Design Checklist Before Ordering

Use this page after the main oligo pool guide when you are turning a CRISPR, NGS, mutagenesis, or gene-assembly idea into an order-ready pool. It walks through application choice, sequence rules, batch QC, vendor requirement definition, and submission prep so you can catch avoidable failures before ordering.

Scientist collaborating over DNA sequence alignments and design software

Planning and validating library sequences before array synthesis.

When to Use This Design Checklist

This checklist is for the downstream design step after the application and pool requirements are clear. If you still need the definition, synthesis-route map, QC path, or vendor-decision sequence, start with the main oligo pool guide before using the order-ready sequence checklist below. This page defines the sequence package and quote requirements; use the vendor comparison only after the full-length sequence set, QC expectations, and delivery needs are known.

🧪

Individual Oligo

Quote per sequence
1 sequence • Shorter order path
🧬

Oligo Pool

Quote by tier
Many sequences • Depends on tier
💰

Scale Advantage

Improves at scale
per sequence • Plan early

Pre-Order Design Checklist

1

Choose Your Application

Different applications have different pool requirements. A CRISPR sgRNA pool, gene-assembly pool, NGS panel, or mutagenesis library should be planned from final full-length oligos, not only guide or target regions.

Design a CRISPR sgRNA Oligo Pool →Design a Custom NGS Panel Oligo Pool →Design a Mutagenesis Oligo Pool →Assemble Synthetic Genes from an Oligo Pool →
2

Design Your Sequences

Follow the sequence design rules: keep GC content between 30-70%, avoid homopolymers (>4 bases), check for secondary structures (ΔG > -3 kcal/mol), and maintain length uniformity within ±10% across the pool.

GC Analyzer →Structure Predictor →
3

Screen for Synthesis Problems

Run all sequences through batch QC to identify problematic oligos before ordering. This step catches 5-15% of sequences that would fail synthesis or under-represent in the pool.

Batch QC →
4

Define Vendor Requirements

Convert the design into comparable quote requirements: pool-size tier, full-length oligo tier, QC scope, delivery amount, turnaround definition, file format, and quote terms. Move to vendor comparison only after these requirements are explicit.

Compare Vendors After Requirements Are Clear →
5

Submit & Validate

Format your sequences as FASTA or CSV, submit order, and after synthesis, validate pool quality by NGS. Check representation (≥90%), dropout (<10%), and uniformity (CV <3-fold).

Format Adapter →Uniformity Estimator →

Design Rules Quick Reference

RuleAcceptableAvoidTool to Check
GC Content30-70%<25% or >75%Check →
Homopolymers≤4 bases≥5 consecutive same baseCheck →
Secondary StructureΔG > -3 kcal/molStrong hairpins (ΔG < -5)Check →
Length Uniformity±5-10% of target length>20 bp variationCheck →
Repeats≤4 bp repeat unitsLong tandem repeatsCheck →

For detailed design constraints, open the design rules page.

Pre-Order Checks That Prevent Rework

✕

Skipping pre-synthesis QC

Always run Batch QC before ordering. 5-15% of sequences have synthesis-problematic features.

✕

Ordering oligos too long for the selected tier

Check the full sequence length, including adapters and constant regions, against the current quote before ordering.

✕

Not including controls

Add 500-1,000 non-targeting sequences for CRISPR, or wild-type sequences for mutagenesis.

✕

Ignoring secondary structures

Hairpins with ΔG < -5 kcal/mol cause synthesis dropout. Screen with Structure Predictor.

✕

Using wrong file format

Each vendor has specific format requirements. Use our Format Adapter to avoid rejection.

Frequently Asked Questions

Should I start with the oligo pool overview before this checklist?â–¾
Yes if the application, synthesis method, QC expectation, or vendor-decision path is still open. Use the main oligo pool guide first, then return here once you are ready to turn the project into order-ready sequences.
What applications use oligo pools?â–¾
CRISPR library screening (70K-200K sgRNAs), NGS target capture panels (2K-400K probes), gene assembly (10-300 overlapping fragments), deep mutational scanning (DMS), MPRA reporter assays, and DNA data storage. CRISPR screening is the largest application by volume.
What is the maximum oligo length in a pool?â–¾
Maximum length depends on vendor, product tier, modifications, and whether the sequence includes adapters or constant regions. Keep oligos as short as the application allows, then confirm the full insert length against the current vendor comparison and quote before ordering.
How do I submit my oligo pool order?â–¾
Prepare a FASTA, CSV, TSV, or vendor-template file with unique sequence IDs and final full-length sequences. Check the selected vendor portal for current columns, character rules, length tier, and minimum-order terms. Use the Vendor Format Adapter to create a clean review file.
How long does oligo pool synthesis take?â–¾
Turnaround depends on vendor, tier, pool size, length, modifications, QC scope, cloning needs, and shipping region. Confirm whether the quoted timeline means production start, shipment, delivery, or QC report availability.

Related Oligo Pool Planning Pages

Review Oligo Pool Design Rules

Check the technical constraints that prevent synthesis failures.

Compare Oligo Pool Vendors

Match pool size, QC scope, delivery assumptions, and turnaround before vendor confirmation.

Open Ordering Checklist

Check file formats, IDs, pool size, and submission details before sending the order.

Estimate Oligo Pool Cost

Estimate pool cost by application, scale, and vendor fit.

Read Oligo Pool QC Metrics

Understand uniformity, dropout, error rate, and Gini before or after ordering.

Choose Between Array and Column Synthesis

Compare array-based and column-based synthesis trade-offs.