454 Life Sciences offers a range of DNA sequencing solutions that can help you unlock the secrets of your genetic material. Their technology allows for rapid and accurate sequencing of entire genomes.
Their systems are capable of generating millions of DNA sequences in a single run, making it an ideal solution for researchers who need to analyze large amounts of data. This is particularly useful for projects that require high-throughput sequencing.
One of the key benefits of 454 Life Sciences' DNA sequencing solutions is their ability to provide long-range sequencing capabilities. This means that researchers can sequence entire genomes without the need for multiple runs or assembly of smaller fragments.
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Technology and Products
454 Life Sciences was a pioneer in next-generation DNA sequencing technology. Their sequencing machines were capable of producing impressive results.
The Genome Sequencer FLX system was a large-scale parallel pyrosequencing system that could sequence roughly 400-600 megabases of DNA per 10-hour run. This was made possible by using a water-in-oil emulsion to fix DNA fragments to small DNA-capture beads.
The system's efficiency was further increased by using PCR to amplify the DNA-bound beads. Each bead was then placed into a ~29 μm well on a PicoTiterPlate, a fiber optic chip.
454 Life Sciences released the GS20 sequencing machine in 2005, making it the first next-generation DNA sequencer on the market. This marked a significant milestone in the field of DNA sequencing.
The GS FLX Titanium series reagents, launched in 2008, allowed for even faster sequencing with the ability to sequence 400-600 million base pairs per run. This was achieved with 400-500 base pair read lengths, making it an incredibly powerful tool for researchers.
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Technology
The 454 Sequencing technology was a game-changer in the field of DNA sequencing, allowing for the sequencing of up to 400-600 megabases of DNA per 10-hour run.
The technology relied on a large-scale parallel pyrosequencing system, which fixed nebulized and adapter-ligated DNA fragments to small DNA-capture beads in a water-in-oil emulsion. These beads were then amplified by PCR and placed into a PicoTiterPlate, a fiber optic chip.
The PicoTiterPlate was designed to maximize the number of wells that contain a single amplified library bead, ensuring efficient sequencing. Each bead was placed into a ~29 μm well on the plate.
The Genome Sequencer FLX instrument was the first next-generation DNA sequencer on the market, released in 2005 by 454 Sequencing. It was later upgraded with the GS FLX Titanium series reagents in 2008, allowing for the sequencing of 400-600 million base pairs per run with 400-500 base pair read lengths.
The GS Junior System, a bench top version of the Genome Sequencer FLX System, was introduced in late 2009, providing a more compact and user-friendly sequencing solution.
Here's a brief overview of the sequencing process:
- Single-stranded template DNA library beads were added to the DNA Bead Incubation Mix and layered with Enzyme Beads onto a PicoTiterPlate device.
- The device was centrifuged to deposit the beads into the wells, ensuring efficient sequencing.
- The loaded PicoTiterPlate device was placed into the Genome Sequencer FLX Instrument, which delivered sequencing reagents across the wells of the plate.
- Millions of copies of DNA bound to each of the beads were sequenced in parallel, generating a light signal proportional to the number of nucleotides added.
The signal strength was proportional to the number of nucleotides, with homopolymer stretches generating a greater signal than single nucleotides. However, the signal strength for homopolymer stretches was linear only up to eight consecutive nucleotides, after which it fell off rapidly.
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DNA Library Preparation and PCR
Genomic DNA is first fractionated into smaller fragments, ranging from 300 to 800 base pairs in length. This process is crucial for preparing the DNA library.
These fragments are then polished to make them blunt at each end. This step is necessary to prevent any issues during the subsequent ligation process.
Short adaptors are ligated onto the ends of the fragments, providing priming sequences for both amplification and sequencing of the sample-library fragments. This is a critical step in preparing the DNA library for PCR.
One of these adaptors contains a 5'-biotin tag, which allows the DNA library to be immobilized onto streptavidin-coated beads. This tagging process is essential for the subsequent steps in the DNA library preparation.
The non-biotinylated strand is released and used as a single-stranded template DNA library, which is then assessed for its quality. The optimal amount of DNA copies per bead is determined by titration to ensure the best possible results.
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The sstDNA library is then immobilized onto beads, with each bead carrying a single sstDNA molecule. This ensures that each bead has a unique DNA sequence for amplification.
The beads containing the library fragment are emulsified with amplification reagents in a water-in-oil mixture, creating a microreactor for PCR amplification to occur. This process allows for the clonal amplification of the DNA fragments.
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Recent Developments
454 Life Sciences has been at the forefront of Next-Generation Sequencing (NGS) technology.
The company was acquired by Roche in 2007, marking a significant milestone in its development.
454 Life Sciences introduced the GS FLX, a revolutionary sequencing platform that could produce over 400 million bases of data in a single run.
This platform was a game-changer in the field of genomics, enabling researchers to analyze complex biological systems with unprecedented speed and accuracy.
The GS Junior, a more affordable and compact version of the GS FLX, was also introduced, making NGS technology more accessible to a wider range of researchers.
454 Life Sciences continued to innovate and improve its technology, releasing the GS FLX+ in 2010, which boasted even higher sequencing speeds and data output.
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Frequently Asked Questions
Is Roche 454 discontinued?
Roche 454 was discontinued by Roche in 2013, but production continued until mid-2016. The technology became noncompetitive, leading to its eventual shutdown.
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