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A unique barcode sequence used on the cell hashing antibody can be designed to be different from an antibody barcode present on the ADTs used in CITE-seq. This makes it possible to couple cell hashing with CITE-seq on a single sequencing run. [12] Cell hashing allows super-loading of the scRNA-seq platform, resulting in a lower cost of sequencing.
The EMBL Nucleotide Sequence Database (EMBL-Bank) has increased in size from around 600 entries in 1982 to over 2.5×10 8 by December 2012. [16] The EMBL Nucleotide Sequence Database (also known as EMBL-Bank) is the section of the ENA which contains high-level genome assembly details, as well as assembled sequences and their functional annotation.
One type of sequencing method can be used in preference to another depending on the type of the sample, for a genomic sample assembly-based methods is used; for a metagenomic sample it is preferable to use read-based methods. [10] Metagenomic sequencing methods have provided better results than genomics, due to these present fewer false negatives.
The small fragments (historically 27 nucleotides long, but now limited only by sequencing technologies) from the very beginnings of mRNAs (5' ends of capped transcripts) are extracted, reverse-transcribed to cDNA, PCR amplified (if needed) and sequenced. CAGE was first published by Hayashizaki, Carninci and co-workers in 2003. [1]
[13] [14] The analysis of eDNA starts with capturing an environmental sample of interest. The DNA in the sample is then extracted and purified. The purified DNA is then amplified for a specific gene target so it can be sequenced and categorised based on its sequence. [15] From this information, detection and classification of species is ...
Optical mapping [1] is a technique for constructing ordered, genome-wide, high-resolution restriction maps from single, stained molecules of DNA, called "optical maps". By mapping the location of restriction enzyme sites along the unknown DNA of an organism, the spectrum of resulting DNA fragments collectively serves as a unique "fingerprint" or "barcode" for that sequence.
The advent of second-generation sequencing technologies has made it possible to obtain sequence information across the entire bacterial genome at relatively modest cost and effort, and MLST can now be assigned from whole-genome sequence information, rather than sequencing each locus separately as was the practice when MLST was first developed. [15]
Whereas high sequence coverage for a genome may indicate the presence of repetitive sequences (and thus be masked), for a transcriptome, they may indicate abundance. In addition, unlike genome sequencing, transcriptome sequencing can be strand-specific, due to the possibility of both sense and antisense transcripts. Finally, it can be difficult ...