Tag: Kraken2

Building a Simulated Metagenomic Dataset

Building a Simulated Metagenomic Dataset – HackMD       Published Linked with GitHub — tags: ‘JPL: Genetic Inventory Project’ — # Building a Simulated Metagenomic Dataset Here we’ll create a simulated metagenomic datasets for controlled testing. This dataset was used to determine the Kraken 2 confidence score that best…

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Bronchoalveolar Lavage Fluid for Metagenomic Sequencing

Introduction Severe pneumonia is one of the most common causes of infectious diseases among patients in the intensive care unit (ICU), and this can lead to various complications and high mortality.1–3 Timely and accurate pathogen diagnoses are crucial for appropriate antimicrobial therapy and improved clinical outcomes. However, the low detection…

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A new approach produces a 90-fold increase in

Article Highlight | 15-Jun-2022 Researchers leverage viruses identified from worldwide environmental samples to expand knowledge of viral taxa and their role in tree microbiomes DOE/US Department of Energy image: Analysis of metatranscriptome samples with novel viral taxa in Populus. (Top) Graphical abstract of the pipeline. (Bottom) Percentage read classification with novel…

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Get reference genome from Kraken2 taxID

Get reference genome from Kraken2 taxID 0 I have a ~10Gb ONT metagenome from citrus psyllid that I am trying to extract bacterial contigs from to assemble. My current thought for a pipeline is broadly as follows: Tentative ID of each contig with Kraken2, then QC to only take assignments…

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Director of Bioinformatics in Chicago, IL for University of Chicago (UC)

Details Posted: 03-May-22 Location: Chicago, Illinois Type: Full-time Salary: Open Categories: Research – Laboratory/Non-Laboratory Staff/Administrative Location: Hyde Park Campus Job Description: Provides technical expertise in the selection, validation, and implementation of the appropriate internal and external data analytic and bioinformatic solutions needed to analyze specimens, process and integrate data, and…

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Minimap2 detects too many 16S sequences in metagenome

16S is a very conserved sequence, which is why it’s used for targeted phylogenetic analysis; it makes it easy to amplify and analyse. Unfortunately that conservation is an issue with minimap2, which is built around the idea that matching scattered subsequences within a sequence is good enough for identifying matches…

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Frontiers | Machine Learning and Deep Learning Applications in Metagenomic Taxonomy and Functional Annotation

Introduction The study of the microbial environments has benefited from the sequencing revolution, where technology improvement decreased the DNA sequencing cost and increased the number of sequenced nucleic bases. For approximately 20 years (depending on how we define the term metagenomics), it has allowed the decryption of the microbial composition…

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Optimization of cerebrospinal fluid microbial DNA metagenomic sequencing diagnostics

We implemented a metagenomic DNA sequencing methodology to unbiasedly detect microbial species in CSF samples from patients with CNS symptoms in which a pathogen or EBV had been detected (Additional 3: Table 1). Samples positively identified with pathogen-specific quantitative PCR (qPCR), 16S rRNA gene sequencing or bacterial/mycotic culture in CSF…

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Custom Kraken2 db

Custom Kraken2 db 0 Hi, I have created a custom kraken2 database but it produced an unmapped.txt file with a list of accession numbers. 1) How do I find the taxa that have been included in this created db? 2) Is there a way to overcome this issue? For example,…

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Kraken2

Kraken2 0 I wanted to make a kraken database but i got this error while running the command.I am using Kraken2 $ kraken2-build –standard –threads 24 –db kraken2database/ Downloading nucleotide gb accession to taxon map… done.Downloading nucleotide wgs accession to taxon map… done.Downloaded accession to taxon map(s)Downloading taxonomy tree data……

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bash script not a valid identifier

bash script not a valid identifier 2 I am trying to run bash script, but it gives this error ( `$fastq’: not a valid identifier). #!/bin/bash database=”kraken2_database” fastq=”fastq_dir” for $fastq in $(ls *_R1.fastq.gz | sed ‘s/_R1.fastq.gz//’) do kraken2 –db $database –threads 8 –memory-mapping –use-names –confidence 0.1 –report taxonomy_reads/${fastq}_kraken2.tax –paired ${fastq}_R1.fastq.gz…

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Adding new taxa to a Kraken2 db

Hi, can someone please check if these following steps are correct? I am trying to add to my plants kraken2 db (“plant_original”) few taxa genomes that I have downloaded from the NCBI website (alnus_glutinosa_GCA_003254965.1.fna, carpinus_fangiana_GCA_006937295.1.fna etc..). for file in *.fna do kraken2-build –add-to-library $file –db PATH/kraken/plant_original done Masking low-complexity regions…

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Kraken2 output visualisation with Krona Viruses not shown

Kraken2 output visualisation with Krona Viruses not shown 0 Dear all, I am trying to visualize my kraken2 output with Krona and the results look very doubtful. I build a metagenomic pipeline with multiple filtering steps and I should have mainly viral sequences (a brief look into my kraken2 output…

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