Designing of custom barcodes for sequencing on the MGI platform

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Abstract
The MGI (MGI Tech Co. Ltd., China) next-generation sequencing platform, including the DNBSEQ-G50, -G400, and -T7 sequencers, is being actively adopted in research. Despite its widespread adoption, challenges persist in the form of limitations associated with the manufacturer's provided barcode set for library preparation. These limitations include constraints on the number of samples that can be concurrently sequenced, compatibility issues with barcodes from diverse or incomplete sets, and restrictions on the sample ratio. Purpose: to develop a universal method that allows sequencing of up to 252 samples simultaneously on a single sequencer lane, while eliminating barcode-related limitations. We proposed a “quad method” that provides 4 or 4n+2 equilibration of barcodes. This paper also delves into its comprehensive analysis, verification procedures, seamless integration into the sequencing process and validation of the method on the DNBSEQ G-400 platform. The quad method showed efficiency and reliability, allowing sequencing of up to 252 samples simultaneously without compromising data quality. The proposed method optimizes library preparation and improves the flexibility of sequencing on the MGI platform.

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