Dna Sequencing Library
Dna Sequencing Library - Related Videos
12:01
3' End Sequencing Library Preparation with A-seq2
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Cited by 9 •
2017
This protocol describes a method for mapping pre-mRNA 3' end processing sites.
11:14
Primer-Free Aptamer Selection Using A Random DNA Library
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Cited by 20 •
2010
SELEX protocols comprise multiple rounds of selection, each of which require regeneration of bound ligands, which in turn require fixed primer sequences flanking the random library regions. These fixed primer sequences can interfere with the selection process (false positives and negatives). Here we present a primer-free protocol.
09:31
Amplification, Next-generation Sequencing, and Genomic DNA Mapping of Retroviral Integration Sites
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Cited by 56 •
2016
We describe a protocol for amplifying retroviral integration sites from the genomic DNA of infected cells, sequencing the amplified virus-host junctions, and then mapping these sequences to a reference genome. We also describe techniques to quantify the distribution of integration sites relative to various genomic annotations using BEDTools.
08:38
Targeted DNA Methylation Analysis by Next-generation Sequencing
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Cited by 83 •
2015
Bisulfite amplicon sequencing (BSAS) is a method for quantifying cytosine methylation in targeted genomic regions of interest. This method uses bisulfite conversion paired with PCR amplification of target regions prior to next-generation sequencing to produce absolute quantitation of DNA methylation at a base-specific level.
10:32
A Universal Protocol for Large-scale gRNA Library Production from any DNA Source
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Cited by 2 •
2017
Methods for generating large-scale gRNA libraries should be simple, efficient and cost-effective. We describe a protocol for the production of gRNA libraries based on enzymatic digestion of target DNA. This method, CORALINA (comprehensive gRNA library generation through controlled nuclease activity) presents an alternative to costly custom oligonucleotide synthesis.
FAQs
Adapters provide functional sequences that connect prepared fragments to later sequencing steps. They can supply priming sites for reading the insert, sample indexes for distinguishing libraries, and, when required, sequences that enable attachment to a flow cell. Consequently, adapter design affects how samples are identified and whether fragments can be processed by the selected high-throughput instrument.
Fragment size affects how genomic or targeted DNA is represented in the library and therefore influences sequencing coverage and data quality. Preparation may begin with fragmented genomic DNA or generated amplicons, depending on the experimental goal. Maintaining an appropriate and consistent fragment-size distribution helps align the resulting reads with the intended whole-genome, exome, targeted, or RNA-derived analysis.
Library complexity describes the range and representation of distinct DNA fragments available for sequencing. If that representation is limited, coverage and data quality can be affected because fewer unique fragments contribute information. Limited amplification may increase the amount of material available for an instrument, but preparation decisions must preserve representative fragment content so downstream genetic measurements remain informative.
A typical workflow starts by fragmenting genomic DNA or generating targeted amplicons. The fragments then undergo end repair or other end modifications before adapters are ligated. Sample indexes may be incorporated, and limited amplification can increase the available library material. These steps produce fragments with the sequences and structure needed for high-throughput sequencing and later sample-specific analysis.
These library types differ primarily in the material or genomic scope they represent. Whole-genome libraries support broad genomic analysis, whereas exome and targeted libraries focus sequencing on selected regions. RNA-derived libraries support analysis of gene expression patterns and other RNA-related molecular features. Choosing among them connects library preparation to the biological question and the desired sequencing output.
After sequencing, the library can support detection of genetic variants, assessment of gene expression patterns, and examination of other molecular features, depending on the source material and library design. Fragment size, representation, and complexity influence coverage and data quality, so these preparation characteristics affect how confidently the resulting data describe the selected genetic or molecular targets.