What is dual indexing sequencing?
Understanding Dual Index Sequencing Unique dual indexes allow you to increase the number of samples sequenced per run and reduce per-sample cost compared to other indexing strategies. With just one unique dual index plate, you can pool 96 samples together.
What is the difference between Miseq and NextSeq?
Discard of sequencing the whole genome, the price seems to be the same for the two instruments. The advantage of Miseq is that it can get the 2×300 READS while NextSeq is 150bp. However, the NextSeq uses a new dying system for the flow cell that it can generate more data for specific target.
What is unique dual indexing?
Unique dual indexing is a sequencing strategy that has distinct, unrelated index sequences for each of the i5 and i7 index reads. Unique dual indexing is a known mitigation for filtering index-hopped reads seen in downstream analyses.
What are dual index primers?
Description. The Multiplexing Unique Dual Index Primers contains primer mix for multiplexing samples for Next Generation Sequencing (NGS) on the illumina platform. Multiplexing of NGS samples will reduce sequencing costs by pooling multiple NGS libraries into a single flow cell lane.
What are i5 and i7 in sequences?
Answer: Dual index libraries have i5 and i7 index sequences. The i5 and i7 reads are necessary to identify the Sample Indexes. These Sample Indexes are needed to distinguish between pooled libraries and are used for demultiplexing. If the i5 and i7 reads are shortened, it may be difficult to demultiplex pooled samples.
What is an i7 index?
3 Index 1 (i7) Read—Following Index Read preparation, the Index 1 (i7) Read performs up to 20 cycles of sequencing. NOTE The number of cycles in each Index Read depends on the system and run parameters.
How many reads from NextSeq?
Reads Passing Filter
| NextSeq 550 System High-Output Kit | NextSeq 550 System Mid-Output Kit | |
|---|---|---|
| Single Reads | Up to 400 Million | Up to 130 Million |
| Paired-End Reads | Up to 800 Million | Up to 260 Million |
What are i5 and i7 indexes?
The i5 and i7 reads are necessary to identify the Sample Indexes. These Sample Indexes are needed to distinguish between pooled libraries and are used for demultiplexing. If only one sample is being sequenced in one lane, the impact of shorter i5 or i7 reads may be diminished.
What is an index primer?
27th Jan, 2016. Alison Dicker. University of Dundee. Different pairs of index primers are added to individual samples in a second thermocycling step, after initial amplification of the target region. This allows you to mix many samples together (up to 96) and sequence them at the same time.
What is dual-indexed sequencing?
Dual-indexed sequencing includes two index reads after Read 1: the Index 1 Read and the Index 2 Read.Sequencing kits for HiSeq systems are available with a single-read or paired-end flow cell. For all other systems, sequencing kits include a paired-end flow cell.
What is uniqueunique dual indexing and how does it work?
Unique dual indexing is a known mitigation for filtering index-hopped reads seen in downstream analyses. Misassigned reads will be flagged as “undetermined reads” and can be excluded from analysis. For more information about index hopping refer to Effects of Index Misassignment on Multiplexing and Downstream Analysis.
What is the single-indexed sequencing workflow?
The single-indexed sequencing workflow applies to all Illumina sequencing platforms, where an Index Read follows Read 1. Figure 1 Single-Indexed Sequencing Read 1—Read 1 follows the standard Read 1 sequencing protocol using SBS reagents. The Read 1 sequencing primer is annealed to the template strand during the cluster generation step.
What is combinatorial dual indexing and how does it work?
With combinatorial dual indexing, every i5 and i7 is shared among other samples on the same plate with indexes repeating down rows and across columns. The combinations are unique though the individual indexes are not.
