Package: kraken2 (2.1.2-2)
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Taksonomisk klassifikationssystem der bruger præcise k-mer-træffere
Kraken 2 er den nyeste version af Kraken, et taksonomisk klassifikationssystem, der bruger præcise k-mer-træffere til at opnå høj præcision og hurtige klassifikationshastigheder. Dette program matcher hver k-mer i en forespørgelsessekvens til den laveste fælles forfader (LCA) for alle genomer indeholdende den angivne k-mer. K-mer- opgaverne informerer klassifikationsalgoritmen. (se: Kraken 1's internetside for detaljer).
Kraken 2 tilbyder signifikante forbedringer til Kraken 1, med hurtigere databasebyggetider, mindre databasestørrelser og hurtigere klassifikationshastigheder. Disse forbedringer blev opnået af de følgende opdateringer til klassifikationsprogrammet Kraken:
1. Storage of Minimizers: Instead of storing/querying entire k-mers, Kraken 2 stores minimizers (l-mers) of each k-mer. The length of each l-mer must be ≤ the k-mer length. Each k-mer is treated by Kraken 2 as if its LCA is the same as its minimizer's LCA. 2. Introduction of Spaced Seeds: Kraken 2 also uses spaced seeds to store and query minimizers to improve classification accuracy. 3. Database Structure: While Kraken 1 saved an indexed and sorted list of k-mer/LCA pairs, Kraken 2 uses a compact hash table. This hash table is a probabilistic data structure that allows for faster queries and lower memory requirements. However, this data structure does have a <1% chance of returning the incorrect LCA or returning an LCA for a non-inserted minimizer. Users can compensate for this possibility by using Kraken's confidence scoring thresholds. 4. Protein Databases: Kraken 2 allows for databases built from amino acid sequences. When queried, Kraken 2 performs a six-frame translated search of the query sequences against the database. 5. 16S Databases: Kraken 2 also provides support for databases not based on NCBI's taxonomy. Currently, these include the 16S databases: Greengenes, SILVA, and RDP.
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Download kraken2
Architecture | Package Size | Installed Size | Files |
---|---|---|---|
i386 | 820.5 kB | 1,814.0 kB | [list of files] |