NGS Library Preparation Kits for Next-Generation Sequencing Workflows

NGS Library Preparation Kits covers the kits used to convert input DNA or RNA into indexed, adapter-ligated sequencing libraries compatible with next-generation sequencing platforms. Kits span whole genome sequencing, whole exome sequencing, RNA-seq, targeted panel sequencing, and amplicon sequencing, with formats for Illumina short-read and long-read platforms including PacBio and Oxford Nanopore. Academic and core laboratories building sequencing libraries can benefit from guidance when selecting platform compatibility, library type, and application-specific workflows for optimal sequencing performance.

Looking for a specific NGS library prep kit? Contact customerservice@mbpinc.net for a quotation and expert guidance on selecting the right library format, platform compatibility, and workflow for your sequencing application.

NGS Library Preparation Kits

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What are NGS library preparation kits?

NGS library preparation kits convert input nucleic acids into sequencing-ready libraries: DNA or RNA input is fragmented or amplified, end-repaired and A-tailed, ligated to platform-specific sequencing adapters, amplified by PCR to increase library quantity, and quality-checked before loading onto a sequencer. Different kit types are optimized for different input types and experimental goals, including whole genome sequencing (WGS) from genomic DNA, RNA-seq from total RNA or mRNA, targeted enrichment panel sequencing, and amplicon sequencing from PCR products.

What you will discover:

Genomic DNA quantifaion:

Advanced systems such as the MagQuant Plus DNA Kit V2 employ paramagnetic technology to concurrently measure and normalize DNA concentrations from various sources without requiring standard curves.
Flexible kit sizes varying from 10 to 5000 preparations, intended to accommodate all needs from small pilot studies to large-scale industrial NGS library creation and amplicon normalization.

How to choose NGS library preparation kits

Match your library prep kit to your input nucleic acid type

DNA library prep kits for WGS or targeted sequencing start with genomic DNA and include fragmentation (mechanical or enzymatic), end-repair, A-tail addition, and adapter ligation steps, while RNA-seq kits start with total RNA or polyA-selected mRNA, convert it to cDNA, and proceed with double-stranded cDNA library construction steps.

Confirm the kit is compatible with your sequencing platform

Adapter sequences, library structure, and minimum insert sizes differ between Illumina short-read libraries, PacBio SMRT sequencing libraries, and Oxford Nanopore long-read libraries, making platform-specific kit selection essential. Using an Illumina-optimized kit for a PacBio run will produce a library that cannot be sequenced on that instrument.

Choose a low-input or ultra-low-input kit for limited samples

Standard library prep kits are optimized for 100 ng to 1 µg of input DNA or RNA, while low-input kits support 1–100 ng and ultra-low-input or single-cell kits can work from picogram-scale input. Starting with insufficient DNA for a standard kit produces libraries of low complexity with high duplicate rates.

Decide whether a PCR-free or PCR-amplified library protocol is appropriate

PCR-free WGS library protocols avoid amplification bias at GC-extreme regions and reduce PCR duplicate rates, which is critical for variant calling accuracy, but require higher input DNA amounts. PCR-amplified protocols use fewer nanograms of input DNA but introduce bias that reduces uniformity of coverage at GC-extreme regions.

Confirm the indexing strategy supports your multiplexing depth

Dual-index libraries, using unique combinations of two barcodes per sample, provide more reliable sample demultiplexing in highly multiplexed sequencing runs and dramatically reduce index-hopping errors compared with single-index strategies, particularly on Illumina patterned flow cells.

Specifications context

PCR-free whole genome sequencing library protocols require a higher DNA input amount than PCR-amplified protocols, typically at least 200–300 ng of high-quality genomic DNA, because no amplification step increases the library amount after adapter ligation. As of 2026, enzymatic DNA fragmentation approaches for library preparation have continued to expand as alternatives to mechanical sonication, offering comparable library quality without specialized sonication equipment and enabling more consistent fragmentation of smaller input amounts.

Enhance your library complexity—reach out to the MBP team now for a price on our expert NGS preparation kits.

FAQ

A standard NGS library preparation workflow for DNA includes: DNA quantitation and quality assessment, fragmentation to the target insert size, end-repair to generate blunt ends, A-tail addition of a 3-prime adenosine overhang for adapter ligation, ligation of platform-specific adapters carrying unique sample indexes, optional PCR amplification to increase library quantity, and library quality check by Bioanalyzer or qPCR before sequencing. RNA-seq adds a cDNA synthesis step before the DNA library steps.

Standard library prep kits are optimized for 100 ng to 1 µg of input nucleic acid, and using less input than the kit is designed for typically produces a library of poor complexity with high duplicate rates because there are not enough starting molecules to represent the genome at adequate diversity. Low-input kits use more efficient adapter ligation chemistry and optimized amplification specifically validated to produce complex libraries from picogram- to nanogram-scale inputs.

PCR-amplified library preparation uses a PCR step after adapter ligation to increase library quantity from low input, but amplification introduces bias in GC-extreme genomic regions and creates PCR duplicate reads that consume sequencing depth without adding information. PCR-free library preparation skips amplification entirely, requiring higher input but producing more uniform coverage across all GC content ranges, which is particularly important for accurate variant calling in AT-rich and GC-rich regions.

Dual indexing uses a unique pair of two distinct index sequences per sample, rather than a single index, which dramatically reduces the risk of index-hopping errors — where an index sequence is incorrectly assigned to a read from a different sample — particularly on Illumina patterned flow cells where index-hopping rates are higher. For experiments multiplexing many samples in a single sequencing run, dual indexing provides substantially more reliable sample demultiplexing.

RNA-seq library preparation begins with an additional step to either select polyadenylated mRNA from total RNA using oligo-dT pulldown, or deplete ribosomal RNA from total RNA, followed by RNA fragmentation and first-strand and second-strand cDNA synthesis before proceeding to the standard DNA library steps of end-repair, A-tailing, adapter ligation, and PCR amplification. These additional steps are necessary because sequencers read DNA, not RNA directly.

Enzymatic DNA fragmentation uses a cocktail of DNA-cutting enzymes to fragment input DNA to a target size range, as an alternative to mechanical sonication using instruments like the Covaris. Enzymatic fragmentation requires no specialized equipment, can be done in a standard thermocycler, and is more consistent for small input amounts where sonication efficiency is variable. However, enzymatic fragmentation may introduce minor sequence bias at cut sites compared with the more random fragmentation profile of optimized sonication.

Library quality should be assessed for size distribution, typically using an Agilent Bioanalyzer or TapeStation to confirm the target insert size and absence of adapter dimers, and for concentration and amplifiable molarity, typically using a Kapa Library Quantification qPCR kit rather than NanoDrop, which overestimates library concentration by including non-amplifiable molecules. Confirming both size and amplifiable concentration before loading gives the most reliable cluster density on the flow cell.

Yes, MBP offers academic and bulk pricing for WGS, WES, RNA-seq, and targeted sequencing library preparation kits across Illumina and long-read platforms, with specialist support for kit selection. Orders ship from MBP's US office in Houston, Texas, with stock available in both USD and CAD.

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