Barcode-Tagged DNA Fragment Assembly for Extended Sequence Reads
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Solution Overview
Problem
Current next-generation sequencing technologies have a maximum read length of around 250 bases, limiting the quality of genome assembly and preventing the sequencing of larger genomes and long-range haplotype analysis.
Innovation Solution
A method involving barcode assignment, amplification, fragmentation, and juxtaposition of barcode-containing fragments to random short segments of the original DNA template molecule, followed by assembly to generate extended sequence reads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If current next-generation sequencing technologies are used, then sequencing can be performed with existing platforms, but the read length is limited to around 250 bases which reduces genome assembly quality
Solution Approach 1:
The patent divides long DNA template molecules into multiple shorter fragments that can be sequenced by existing platforms. Each fragment is tagged with a barcode that identifies its origin from the parent long molecule. After sequencing, the fragments are computationally reassembled using their barcodes as guides, effectively achieving long-read sequencing capability through short-read technology.
Solution Approach 2:
The patent embeds barcode sequences within the DNA fragments that are to be sequenced. The barcode acts as a nested identifier inside the fragment structure, allowing the system to track and reassemble fragments into their original long-molecule context. This nested barcode approach enables reconstruction of extended sequences from multiple short reads.
2Manufacturing precision
If read length is increased to several kilobases, then genome assembly quality and long-range haplotype analysis improve, but the complexity of the sequencing method increases
Solution Approach 1:
The patent performs preliminary actions by assigning unique barcodes to DNA fragments before sequencing. This pre-tagging step creates a mapping relationship that simplifies the subsequent assembly process. The barcodes are incorporated during library preparation, so the actual sequencing run itself remains relatively simple while the computational assembly benefits from the pre-established fragment identification system.
Solution Approach 2:
The barcode sequence acts as an intermediary between the short DNA fragments and the long-range assembly goal. Rather than directly sequencing entire long molecules (which would require complex instrumentation), the barcode mediator allows standard sequencers to generate data that can be computationally reassembled into long-range haplotypes and high-quality genome assemblies.
3Length of moving object
If barcode tagging and fragment reassembly is implemented, then extended sequence reads are achieved, but the process time and computational requirements increase
Solution Approach 1:
The patent creates multiple copies of barcode-tagged DNA fragments through PCR amplification before sequencing. This amplification step increases the quantity of template material, allowing parallel processing of many fragments simultaneously. The copying process enables the system to work with numerous fragments in parallel, which can offset the time cost of individual fragment processing and assembly.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Increases the effective read length to several kilobases, enabling sequencing of larger genomes and long-range haplotype analysis with reduced error rates.
Implementation Method 1
the step of purifying the barcode-containing fragments using streptavidin-coated paramagnetic beads
Data Source
AI summary
The present invention provides an approach to increase the effective read length of commercially available sequencing platforms to several kilobases and be broadly applied to obtain long sequence reads from mixed template populations. A method for generating extended sequence reads of long DNA molecules in a sample, comprising the steps of assigning a specific barcode sequence to each template DNA molecule in a sample to obtain barcode-tagged molecules: amplifying the barcode-tagged molecules; fragmenting the amplified barcode-tagged molecules to obtain barcode-containing fragments; juxtaposing the barcode-containing fragments to random short segments of the original DNA template molecule during the process of generating a sequencing library to obtain demultiplexed reads; and assembling the demultiplexed reads to obtain extended sequence reads for each DNA template molecule, is disclosed.