Tag: DADA2

Comparison of Oxford Nanopore Technologies and Illumina MiSeq sequencing with mock communities and agricultural soil

Study sites Soils were collected from two different sites (ARDEC: Colorado State University’s Agricultural Research, Development and Education Center in Fort Collins, CO; and CPCRC: USDA Columbia Plateau Conservation Research Center in Pendleton, OR). At each site, four replicate plots of no-till corn (ARDEC) or no-till annual wheat (CPCRC) were…

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Correct way to remove Nextera adapters from ITS sequences

Correct way to remove Nextera adapters from ITS sequences 0 Hi everyone, I think this question has been coming up a few times but it didn’t help me solve my issue. I have FastQ files from ITS amplicon based metagenomic sequencing (ITS1/2) (300 bp) and FastQC tells me that they…

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Curated and harmonized gut microbiome 16S rRNA amplicon data from dietary fiber intervention studies in humans

Carlson, J. L., Erickson, J. M., Lloyd, B. B. & Slavin, J. L. Health effects and sources of prebiotic dietary fiber. Curr. Dev. Nutr. 2, nzy005 (2018). Article  PubMed  PubMed Central  Google Scholar  Deehan, E. C. et al. Precision microbiome modulation with discrete dietary fiber structures directs short-chain fatty acid…

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Error with DADA2 running Qiime2 on a mock community – Technical Support

Dear all, I am facing a trouble with a command in Qiime2. I am working with Qiime2 from a singularity container, retrieved from the official website. I am trying to use Q2 on some mock communities, in detail I am testing it on Mockrobiota community 2 (found on @gregcaporaso GitHub…

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Reduced trace gas oxidizers as a response to organic carbon availability linked to oligotrophs in desert fertile islands

Makhalanyane TP, Valverde A, Gunnigle E, Frossard A, Ramond JB, Cowan DA. Microbial ecology of hot desert edaphic systems. FEMS Microbiol Rev. 2015;39:203–21. Article  CAS  PubMed  Google Scholar  Pointing SB, Belnap J. Microbial colonization and controls in dryland systems. Nat Rev Microbiol. 2012;10:551–62. Article  CAS  PubMed  Google Scholar  Ji M,…

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Dada2 in Qiime2: losing reads during merging

Dada2 in Qiime2: losing reads during merging 0 Hi! I am trying to use dada2 on my 16S paired-end sequences, from a 2 x 150 bp illumina run. But I am losing almost all my reads at the merging step. The FASTQC shows excellent data quality and no adapters in…

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Dada2 denoise-paired running time over 24hrs and taking more than 4TB temporary space on HPC – Technical Support

I am running DADA2 through QIIME and my demux.qza file is 110GB. After 24Hr I saw it consumed more than 4TB of disk space and the log file is not updating from a certain point.Here I am curious whether it is normal or if there is any glitch and I…

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Assigned taxonomy after dada2 only “NAs” or “Mitochondria”

Hi, I followed the dada2 tutorial on 16S and ITS amplicon metagenomic data from soil samples. However, when trying to assign a taxonomic rank to my ASV table using DECIPHER, I only get “NAs”. When using the dada2 native’s Bayesian method, I get “NA” or “Mitochondria” (family). For my 16S…

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Subset FASTA file for taxonomy (phylum name) in R

Subset FASTA file for taxonomy (phylum name) in R 2 Dear all, I would like to subset a FASTA file so that I get the sequences belonging to a certain phylum (in my case: Nematoda). The headers of the FASTA file start with the phylum name, so I thought this…

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Diversity and compositional differences of the airborne microbiome in a biophilic indoor environment

Klepeis, N. E. et al. The National Human Activity Pattern Survey (NHAPS): A resource for assessing exposure to environmental pollutants. J. Expo. Anal. Environ. Epidemiol. 11, 231–252 (2001). CAS  PubMed  Google Scholar  Richardson, A. et al. Office design and health: A systematic review. N. Z. Med. J. 130, 39–49 (2017)….

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An integrated tumor, immune and microbiome atlas of colon cancer

Samples used in this observational cohort study (tumor tissue and matched healthy colon tissue, AC-ICAM cohort) are from patients with colon cancer diagnosed at Leiden University Medical Center, the Netherlands, from 2001 to 2015 that did not object for future use of human tissues for scientific research and that were…

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Gut microbiome profiling of neonates using Nanopore MinION and Illumina MiSeq sequencing

Introduction Perturbations in the infant gut microbiome during early life affect growth, development, and long-term health (Sherman, 2010; Carl et al., 2014; Tarr and Warner, 2016). Preterm infants have a physiologically and anatomically immature gastrointestinal tract that is known to be more permeable than that of term infants, and their…

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Bacterial metatransciptome antimicrobial resistance genes workflow?

Bacterial metatransciptome antimicrobial resistance genes workflow? 0 Hi everyone! I’m trying to analyse some metatranscriptomics data from different samples, the final goal is to determine wether one group of samples has a higher expression of antimicrobial resistance genes. I’m completely new to RNAseq and I have no clue where to…

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How to write/use qiime2 script for LSF (bsub) + docker set up? – Technical Support

Hello all, I’m looking for guidance on how to write a non-interactive job script for qiime2. The HPC I have access to uses LSF and docker images, which are both new to me. So far, I have been creating an interactive shell to use qiime2 (I created a .sh file…

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The effects of host quantitative genetic architecture on the gut microbiota composition of Chinook salmon (Oncorhynchus tshawytscha)

Anderson MJ (2001) A new method for non‐parametric multivariate analysis of variance. Austral Ecol 26(1):32–46 Google Scholar  Anderson MJ (2004) PERMDISP: a FORTRAN computer program for permutational analysis of multivariate dispersions (for any two-factor ANOVA design) using permutation tests. Department of Statistics, University of Auckland, New Zealand, 24. Aykanat T,…

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Unable to create environment – Technical Support

Tried to create an environment using Conda and was not able to do so. Have copy pasted the message below. Would be grateful to know what the issue is and how to resolve the issue. (base) C:\Users\Mathangi Janakiraman>wget data.qiime2.org/distro/core/qiime2-2023.2-py38-linux-conda.yml–2023-05-11 12:54:47– data.qiime2.org/distro/core/qiime2-2023.2-py38-linux-conda.ymlResolving data.qiime2.org (data.qiime2.org)… 54.200.1.12Connecting to data.qiime2.org (data.qiime2.org)|54.200.1.12|:443… connected.ERROR: cannot verify…

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Shallow shotgun sequencing reduces technical variation in microbiome analysis

Participant selection and sample collection Informed consent was obtained for five adult volunteers. The study protocols were reviewed and approved by the Advarra Institutional Review Board (Advarra, Inc., Columbia, MD). All analyses were performed according to the relevant guidelines and regulations. Fecal collection was completed by self-sampling, which has proven…

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Reduced microbial diversity of the nasopharyngeal microbiome in household contacts with latent tuberculosis infection

Global tuberculosis report 2020. (Geneva: World Health Organization; 2020. Licence: CC BY-NC-SA 3.0 IGO). Acuña-Villaorduna, C. et al. Intensity of exposure to pulmonary tuberculosis determines risk of tuberculosis infection and disease. Eur. Respir. J. 51, 1. doi.org/10.1183/13993003.01578-2017 (2018). Article  Google Scholar  Reichler, M. R. et al. Duration of exposure among…

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How to demultiplex a pooled fastq sequence file and extract each sample sequences

How to demultiplex a pooled fastq sequence file and extract each sample sequences 0 Hello all, I have a pooled sequence file named “ERR1806550_1.fastq.gz” containing single-end sequences. Now, I want to demultiplex this sequence file and extract 37 sample sequences of my interest from it. These are the barcode sequences…

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priors in qiime2-dada2 – General Discussion

Hi,is there an option in the dada2 plugin under qiime2 for “priors” specific sequences as reported in the dada2 tutorial for pseudo-pooling?benjjneb.github.io/dada2/pseudo.html Hello Alberto, Welcome to the forums! You can sort of do this within the Qiime2 pipeline.docs.qiime2.org/2023.2/plugins/available/dada2/denoise-paired/ While you can’t provide expected sequences, you can use–p-pooling-method pseudoto enable pseudo-pooling,…

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Revealing their global influence on health

Several studies have indicated the importance of gut microbes in maintaining human health. These microbes are also associated with fundamental physiologic processes, such as aging, drug response, nutrition, and pathophysiologic states (e.g., cardiovascular, metabolic, oncologic, neurological, and autoimmune diseases). To better understand the causal effects between gut microbes and disease…

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Keeping Unassigned Sequences in the barplot – User Support

Hello, New user here, still trying to set up a workflow that works… I got as far as assigning Taxonomy using a pre-trained database (silva138_AB_V4_classifier.qza).However, there are still some unassigned sequences left. When I want to make a barplot, I get an error because some ‘ Feature IDs found in…

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Import RefSeq Fasta – Losing Sequences from HOMD database – Technical Support

klterwelp (Kat Terwelp) April 20, 2023, 2:45pm 1 Version of qiime2: qiime2-2023.2 installed with conda on an HPC. I’m following the classifier training tutorial. Below is the code I’m using for importing the reference sequences from HOMD to a .qza file. I’ve also attached the resulting .qza file: ref-seqs.qza (19.3…

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SituSeq: an offline protocol for rapid and remote Nanopore 16S rRNA amplicon sequence analysis

For the initial test of this protocol, DNA extraction, PCR, Nanopore library preparation, Nanopore sequencing, and subsequent data analysis were conducted at sea aboard the R/V Atlantic Condor in August 2021 [26]. This investigational effort resulted in the sequencing and analysis of deep sea sediment samples within hours of their…

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Qiime2 denoise- demultiplex crash – Technical Support

Kavini_D (Kavini D) April 14, 2023, 7:48am 1 I have been running into an issue while using the denoising program. I have ran it 3 times now and it seems to suddenly stop working once it reaches the cleaning chimeras part of the program. It doesn’t appear to show any…

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Previously uncharacterized rectangular bacterial structures in the dolphin mouth

To maximize reproducibility, a list of the reagents and resources used in this study, as well as their source and identifier, is provided in Supplementary Table 5. Experimental model and subject details Oral swab samples were obtained from bottlenose dolphins (Tursiops truncatus) managed by the U.S. Navy MMP Biosciences Division, Space…

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Characterization of rumen microbiome and metabolome from oro-esophageal tubing and rumen cannula in Holstein dairy cows

All experimental procedures were conducted at the University of Illinois at Urbana-Champaign and followed protocols approved by the Institutional Animal Care and Use Committee (IACUC) at the University of Illinois at Urbana-Champaign under protocol number 17172. All ARRIVE, and IACUC guidelines and regulations were followed during the entire duration of…

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Mesophilic and thermophilic viruses are associated with nutrient cycling during hyperthermophilic composting

Handa IT, Aerts R, Berendse F, Berg MP, Bruder A, Butenschoen O, et al. Consequences of biodiversity loss for litter decomposition across biomes. Nature. 2014;509:218–21. Article  CAS  PubMed  Google Scholar  Roux S, Adriaenssens EM, Dutilh BE, Koonin EV, Kropinski AM, Krupovic M, et al. Minimum information about an uncultivated virus…

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cutadapt cannot remove primer in the middle of reads – General Discussion

Wei_Zhang (Wei Zhang) April 5, 2023, 4:22pm 1 Hello everyone, I apply qiime2 to my 16S rRNA sequencing data, which is an amplification of the V4 region with a primer pair of “GTGCCAGCMGCCGCGGTAA” and “GGACTACHVGGGTWTCTAAT”. Whereas I use the cutadapt plugin to remove the primer with different commands below, some…

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r – Accessing large data sets in AWS rstudio

Apologies if this is a naive question or not the correct platform to ask, new to AWS, not finding answers online, and this site has help with r challenges before. I am working with sequencing data in r (dada2 package). Based on some research, using AWS EC2 rstudio seemed like…

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How to resolve missing OTUs in Qiime2 analysis despite finding through BLAST? – User Support

qiime version: qiime2-2022.11conda environment Hi everyone, Starting from the sequences obtained from an Illumina MiSeq 300×2 paired end run, I performed an analysis on eDNA using qiime2 and the 16s primer for invertebrates. I also performed the same analysis using another software (OBItools3) on the same dataset.What I noticed is…

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metadata newlines don’t work (Mac OS X, cutadapt) – Technical Support

First (and last?) time running qiime. All I am trying to do at the moment is demultiplex. Qiime cutadapt is unable parse my metadata file no matter what I do to it. I’ve spent hours trying to fix this ridiculous bug. It seems most likely that the cutadapt plugin isn’t…

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High-quality single amplicon sequencing method for illumina MiSeq platform using pool of ‘N’ (0-10) spacer-linked target specific primers without PhiX spike-in

Background: Illumina sequencing platform requires base diversity in the initial 11 cycles for efficient cluster identification and colour matrix estimation. This limitation yields low-quality data for amplicon libraries having homogeneous base composition. Spike-in of PhiX library ensures base diversity but reduces the overall number of sequencing reads for data analysis….

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The persistence and stabilization of auxiliary genes in the human skin virome | Virology Journal

Breitbart M, Bonnain C, Malki K, Sawaya NA. Phage puppet masters of the marine microbial realm. Nat Microbiol. 2018;3:754–66. Article  CAS  PubMed  Google Scholar  Suttle CA. Marine viruses—major players in the global ecosystem. Nat Rev Microbiol. 2007;5:801–12. Article  CAS  PubMed  Google Scholar  Breitbart M. Marine viruses: truth or dare. Ann…

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Is there a placental microbiota? A critical review and re-analysis of published placental microbiota datasets | BMC Microbiology

Principal findings of the study In this re-analysis of fifteen placental microbiota studies, of the ASVs which were ranked in the top five ASVs for relative abundance in any one study, Lactobacillus ASVs were clearly the most prevalent across studies. Yet, Lactobacillus ASV prevalence was explained by background DNA contamination,…

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How can I find detailed documentation of qiime2’s methods and functions in python? – Technical Support

I’ve been trying to run dada2 in python, with the sources available in Qiime2. However I have not been able to extend the use of this API. I can’t know the arguments of many available methods and functions, for example how I could specify the equivalent of “–p-n-threads” or “–p-min-fold-parent-over-abundance”,…

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Contamination source modeling with SCRuB improves cancer phenotype prediction from microbiome data

Salter, S. J. et al. Reagent and laboratory contamination can critically impact sequence-based microbiome analyses. BMC Biol. 12, 87 (2014). Article  PubMed  PubMed Central  Google Scholar  Weyrich, L. S. et al. Laboratory contamination over time during low-biomass sample analysis. Mol. Ecol. Resour. 19, 982–996 (2019). Article  CAS  PubMed  PubMed Central …

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Chronic Strongyloides stercoralis infection increases presence of the Ruminococcus torques group in the gut and alters the microbial proteome

Human ethics statement This study was approved by the Human Ethical Review Committee of Khon Kaen University, Thailand (HE641434) following the principles of the Declaration of Helsinki. Before stool samples were collected, participants were required to complete and sign written informed-consent forms. Participants and samples All samples came from residents…

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Taxonomy not inherited to a filtered table? – User Support

I am using QIIME2 (2023 release) on a HPCC setupIn trying to make a barplot I have encountered an issue I do not understand the possible origin of.As background for this I will explain the path so far: dada2 is used to denoise samples, generating repseqs.qza, table.qza, stats.qza Taxonomy is…

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stdout and stderr error in dada2. qiime2-2023.2 – Technical Support

HiI ran Dada2 on a pair of forward and reverse reads of one sample on qiime2-2023.2 and itdemux.qza (1.2 MB)gives the following error: An error was encountered while running DADA2 in R (return code 1), please inspect stdout and stderr to learn more. debug file contains: Running external command line…

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DADA2 in R (return code -1), error – User Support

Hello, I run Dada2 using the following command I got the error. I am a new user so I don’t understand what is the cause of error? $ qiime dada2 denoise-paired –verbose –p-n-threads 4 –p-trim-left-f 17 –p-trim-left-r 21 –p-trunc-len-f 290 –p-trunc-len-r 250 –i-demultiplexed-seqs demux.qza –o-table table.qza –o-representative-sequences rep-seqs.qza –o-denoising-stats stats-dada2.qza…

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r – Filter phyloseq sequence table using information from sample_data and tax_table

I have phyloseq object where sequence table were builded by using the function mergeSequenceTables from DADA2 package, to merge ten sequence tables from different runs. The sample_data consist of two columns 1)containing sample names same as sequence table column names and 2)study name from which samples comes from. Using this…

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ancombc documentation

excluded in the analysis. Solve optimization problems using an R interface to NLopt. The overall false discovery rate is controlled by the mdFDR methodology we In this formula, other covariates could potentially be included to adjust for confounding. depends on our research goals. W, a data.frame of test statistics. enter…

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Fine-scale evaluation of two standard 16S rRNA gene amplicon primer pairs for analysis of total prokaryotes and archaeal nitrifiers in differently managed soils

1. Introduction Soil harbors high abundance and diversity of prokaryotic microorganisms, with 1 g of soil containing up to 10 billion microbial cells (Torsvik and Øvreås, 2002) and 103–106 phylotypes (Bickel and Or, 2020), including many microorganisms that play critical biogeochemical roles (Crowther et al., 2019). With continuous expansion of prokaryotic…

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Network analysis of 16S rRNA sequences suggests microbial keystone taxa contribute to marine N2O cycling

Fuhrman, J. A. Microbial community structure and its functional implications. Nature 459, 193–199 (2009). Article  CAS  PubMed  Google Scholar  Graham, E. B. et al. Microbes as engines of ecosystem function: when does community structure enhance predictions of ecosystem processes? Front. Microbiol. 7, 214 (2016). Article  PubMed  PubMed Central  Google Scholar …

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Unravelling microalgal-bacterial interactions in aquatic ecosystems through 16S rRNA gene-based co-occurrence networks

Croft, M. T., Lawrence, A. D., Raux-Deery, E., Warren, M. J. & Smith, A. G. Algae acquire vitamin B12 through a symbiotic relationship with bacteria. Nature doi.org/10.1038/nature04056 (2005). Article  PubMed  Google Scholar  Kazamia, E. et al. Mutualistic interactions between vitamin B12-dependent algae and heterotrophic bacteria exhibit regulation. Environ. Microbiol. doi.org/10.1111/j.1462-2920.2012.02733.x…

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Metagenomic mapping of cyanobacteria and potential cyanotoxin producing taxa in large rivers of the United States

Hallegraeff, G. M. Ocean climate change, phytoplankton community responses, and harmful algal blooms: A formidable predictive challenge 1. J. Phycol. 46, 220–235 (2010). Article  CAS  Google Scholar  Itakura, S. & Imai, I. Economic impacts of harmful algal blooms on fisheries and aquaculture in western Japan—An overview of interannual variability and…

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How to process the fastq files from the NCBI SRA using qiime2? – User Support

Man (Tamang) February 15, 2023, 2:07am 1 Hi there,I have been downloading the NCBI SRA fastq project files and most of them have fastq sequences per sample basis. However, in some of the project file submitted to the SRA (Gopalakrishnan et al 2018 Science,www.science.org/doi/10.1126/science.aan4236#supplementary-materials ), I find that there is…

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A first insight into the Polish Bochnia Salt Mine metagenome

Sequencing statistics NGS was used across the V3-V4 region of the 16S rRNA gene to sequence 24 environmental samples. The mean number of ASVs per sample obtained after DADA2 was 72,050 ± 31,480, ranging from 22,568 to 143,267. From a total of 1,729,209 contigs remaining after quality control and removal of chimeras,…

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What specifications of laptop should I buy for bioinformatics?

Hello, I have a question regarding computer settings. The lab I belong to is currently in the process of setting up microbiome research, and is experiencing difficulties in purchasing a computer needed for BI analysis. Qiime2 analysis was performed by installing a virtual machine on a Windows computer with 16GB…

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QIIME2: An error was encountered while running DADA2 in R (return code 1) – Technical Support

eduseb (Eduardo) February 13, 2023, 5:01pm 1 Hello everyone! I’m currently trying to run dada2 denoise-paired. However, it results in the following error: “Plugin error from dada2:An error was encountered while running DADA2 in R (return code 1), please inspect stdout and stderr to learn more.” Anyone has a clue…

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Qiime2 Conversion Script for Valencia – Other Bioinformatics Tools

Fmadere (Ferra Madere) February 9, 2023, 3:58am 1 Hello All, A few months ago I ran some 16S sequencing data through Qiime2. I am now attempting to do some further analysis of the data using Valencia, a nearest-centroid based algorithm for the classification of human vaginal microbial community into state…

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Microbiota-derived acetate enhances host antiviral response via NLRP3

Ethics statement All animal experiments were performed in compliance with the Regulations for the Care and Use of Laboratory Animals issued by the Ministry of Science and Technology of the People’s Republic of China, which enforces the ethical use of animals. The protocol was approved by Institutional Animal Care and…

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record does not start with ‘@’

filterAndTrim : Error in add(bin) : record does not start with ‘@’ 0 Hello I’m using dada 2 version ‘1.22.0’ on windows 10, I have list of compressed (.gz ) fastq files, when I use the function filterAndTrim I get this error message : Error in add(bin) : record does…

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Cause of short sequences in Amplicon Sequencing?

Cause of short sequences in Amplicon Sequencing? 0 Hello, Amplicon sequencing was performed across 9 samples and then I used DAD2 to analyze the variants. 83 Variants were found and below are my top 5: 1.AGTGCTTAAAGACTATTGTTTTATTCCCAAATTGTTCTCTTAATTTTATAACTATCTTATTTAAAGTGTCATTCCATTTTGCTCTACTAAGGTTACAATGTGCTTGTCTTATATCTCCTATTATTTCTCCTGTTGTATAAAATGCTCTGCCTGGTCCTATATTTATACTTTTT 2.ATTGCTTAAAGATTATTGTTTTATTATTTCCAAATTGTTCTCTTAATTTGCTAGCTATCTGTTTTAAAGTGGCATTCCATTTTGCTCTACTAATGTTACAATGTGCTTGTCTCATATTTCCTATTTTTCCTATTGTAACAAATGCTCTCCCTGGTCCCCTCTGGATACGGATACTTTTT 3.GTGCTTAAAGACTATTGTTTTATTCCCAAATTGTTCTCTTAATTTTATAACTATCTTATTTAAAGTGTATCTCCTATTATTTCTCCTGTTGTATAAAATGCTCTGCCTGGTCCTATATTTATACTTTTT 4.AGTGCCTGGTCCTATATTTATACTTTTT 5.AGTGCTTAAAGACTATTGTTTTATTAAAATGCTCTGCCTGGTCCTATATTTATACTTTTT The first three are as expected but what are these…

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Aerial transport of bacteria by dust plumes in the Eastern Mediterranean revealed by complementary rRNA/rRNA-gene sequencing

Katra, I. et al. Richness and diversity in dust stormborne biomes at the Southeast Mediterranean. Sci. Rep. 4, 5265 (2014). Article  CAS  Google Scholar  Kellogg, C. A. & Griffin, D. W. Aerobiology and the global transport of desert dust. Trends Ecol. Evolution 21, 638–644 (2006). Article  Google Scholar  Mazar, Y.,…

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Leveraging 16S rRNA data to uncover vaginal microbial signatures in women with cervical cancer

1 Introduction Cervical cancer (CC) remains the fourth most common cancer in women worldwide, with 604,127 new cases in 2020 and more than 341,831 deaths, accounting for nearly 8% of all female cancer-related deaths annually (Sung et al., 2021). This common infection-related neoplasm and its premalignant precursor are caused by high-risk…

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pre quality-trimmed reads in qiime2.2022.11 – User Support

Hi,I have two questions regarding 300 PE reads pre-trimmed by quality and then imported in qiime2.2022.11. First, I was wondering if the different lengths among forward and reverse reads would be a problem to qiime2 in the merging phase. Moreover, I would like to know if their pre-trimming could affect…

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What should I do with the fastq files of negative controls? – General Discussion

I am using QIIME2 and R packages for microbiome analysis.I think QIIME2 is the best tool, especially for researchers who are about to begin the microbiome analysis. My question is about the decontamination process. I have the fastq files of 16s microbiome sequences from skin tissue samples. The sequence files…

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Microbially produced vitamin B12 contributes to the lipid-lowering effect of silymarin

Animals As female mice/rats resist to HFD-induced obesity and NAFLD, male mice/rats were used to induce obesity and NAFLD model by HFD50. Male Wistar (~180 g body weight; 8 weeks old) rats were purchased from Shandong Laboratory Animal Center with the permission number of SCXK 2014–0007 and raised under thermoneutral housing…

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Time-dependent microbial shifts during crayfish decomposition in freshwater and sediment under different environmental conditions

Seilacher, A. Arbeitskonzept zur konstruktions-morphologie. Lethaia 3, 393–396 (1970). Google Scholar  Seilacher, B. A., Reif, W.-E. & Westphal, F. Sedimentological, ecological and temporal patterns of fossil Lagerstätten. Philos. Trans. R. Soc. Lond. B 311, 5–23 (1985). ADS  Google Scholar  Gibbons, N. E. & Reed, G. B. The effect of autolysis…

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Evolution of snow algae, from cosmopolitans to endemics, revealed by DNA analysis of ancient ice

Classification of snow algae in the ice core based on ITS2 sequences We used high-throughput sequencing to obtain DNA sequences of algae from 19 layers of an ice core drilled on a glacier in central Asia, dated from present time to 8000 years ago (Fig. 1 and Table S1). In total, 17,016…

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Simulated global warming affects endophytic bacterial and fungal communities of Antarctic pearlwort leaves and some bacterial isolates support plant growth at low temperatures

Sample collection Colobanthus quitensis samples were collected at King George Island near the Henryk Arctowski Polish Antarctic Station, Maritime Antarctica (62°14’ S, 58°48’ W) during the summer season (February 2018). Samples were collected inside the Antarctic Specially Protected Area (ASPA) 128 using permits provided by The Chilean Antarctic Institute (INACH)…

Continue Reading Simulated global warming affects endophytic bacterial and fungal communities of Antarctic pearlwort leaves and some bacterial isolates support plant growth at low temperatures

Insights on the bacterial composition of Parmigiano Reggiano Pure Whey Starter by a culture-dependent and 16S rRNA metabarcoding portrait

Smid, E. J. et al. Practical implications of the microbial group construction of undefined mesophilic starter cultures. Microb. Cell Factories 13, S2. doi.org/10.1186/1475-2859-13-S1-S2 (2014). Article  Google Scholar  Stadhouders, J. & Leenders, G. J. M. Spontaneously developed mixed-strain cheese starters. Their behaviour in direction of phages and their use within the…

Continue Reading Insights on the bacterial composition of Parmigiano Reggiano Pure Whey Starter by a culture-dependent and 16S rRNA metabarcoding portrait

Page Not Found – QIIME 2 Forum

Sign Up Log In Log In Popular installing qiime2 with conda – executing transaction timeoutUser Support Cannot run DADA2 in the tutorialsTechnical Support meta analysis and weird looking emperor plot of beta-analysisUser Support QIIME 2 2022.8 is now available!Announcements Qiime Plugin error from fragment-insertionTechnical Support [RESOLVED] Notice to Multi-User System…

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can i skip cutadapt?? – User Support

recently i receive rowdata from NGS center..and i start analysis using QIIME2 i want ‘cutadapt’, so i ask primer sequence to NGS center..but center reply to me “it is secret” if it is neccessery, i request to NGS center…. thank u for reading Hi @svbreqwaiu01, You do not need to…

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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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translateMetagenome2AGORA

translateMetagenome2AGORA 0 Hi I would like to work with the Cobra Microbiome modelling toolbox, I still need to upgrade matlab to work with it but I am already going through the manual and I wondered whether someone has experience with using the translateMetagenome2AGORA function on output of DADA2 pipeline? in…

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Issues removing unwanted taxa from phyloseq object

Hi everyone, I am currently in the process of removing unwanted taxa (Kingdom=”Eukaryota”, Family=”Mitochondria”, and Order=”Chloroplast”) from a phyloseq object I created. This phyloseq object was created using my outputs from DADA2 (OTU table, taxonomy table, and metadata file). I have saved a taxonomy table in CSV format at every…

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The choice of OTUs vs. ASVs in 16S rRNA amplicon data analysis has stronger effects on diversity measures than rarefaction and OTU identity threshold

Advances in the analysis of amplicon sequence datasets have introduced a methodological shift in how research teams investigate microbial biodiversity, away from sequence identity-based clustering (producing Operational Taxonomic Units, OTUs) to denoising methods (producing amplicon sequence variants, ASVs). While denoising methods have several inherent properties that make them desirable compared…

Continue Reading The choice of OTUs vs. ASVs in 16S rRNA amplicon data analysis has stronger effects on diversity measures than rarefaction and OTU identity threshold

Predict Functional potential microbial communities

Predict Functional potential microbial communities – phyloseq Silva 0 Hi, Does anyone have good tutorials/resources on how to predict the metabolic potential from microbiome data. I have preprocessed using DADA2, resulting in a phyloseq object. I assigned taxonomy with SILVA database. I found this Tax4fun package in R implemented in…

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Error rates could not be estimated — unsure why – Technical Support

I’m running dada2 on paired end data and getting the same error over and over again. My data are from an 150 PE run on an Illumina iSeq machine, sequencing a 16s fragment for vertebrates. The samples were demultiplexed by Casava based on the i5 and i7 adapters. Some samples…

Continue Reading Error rates could not be estimated — unsure why – Technical Support

Cannot install Phyloseq and dada2

Hello all, I have been having issues installing packages that I really need to use. Basically, I cannot download either Phyloseq or dada2 and I believe it’s because I don’t have GenomeInfoDbData. But at the same time, I cannot install GenomeInfoDbData because I can’t seem to update the dependencies (“fansi”…

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combine OTU and tax table and replace actual sequences with OTU ids (Phyloseq/dada2)

This is to the part of the question “replace actual sequences with OTU ids (Phyloseq/dada2)?” I contacted the phyloseq/dada2 developers and based on Susan Holmes’ reply (github.com/joey711/phyloseq/issues/1030) I came up with this piece of code to replace the amplicon sequences with a numbered OTU header. Further discussion can be found…

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An error about using DADA2 in QIIME2 – Community Plugin Support

Hi everyone,I analyzed my pacbio data according to this PR, but an error was happened: Error in h(simpleError(msg, call)) : Error: invalid class “SRFilterResult” object: superclass “Mnumeric” no t defined in the environment of the object’s class stop Traceback (most recent call last): File “/home/xxx/miniconda3/envs/qiime2-2021.4/lib/python3.8/site- packages/q2_dada2/_denoise.py”, line 361, in denoise_ccs…

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cutadapt / trim-paired / option “front” and “adapter” – User Support

Hello, I have sequences in paired end that have both primers in R1 and R2 files.For exemple, a sequence in the forward ( R1 ) file :In bold the 2 primers : GTACACACCGCCCGTCGCTCCTACCGATACCGGGTGATCCGGTGAACCTTTTGGACCGTTTTTCGGAAAAATAAGTAAACCATATCACCTAGAGGAAGGAGAAGTCGTAACAAGGTTTCCGTAGGTGAACCTGCAGAAGGATCAAGACCAAGTCTCTGCTACCGTACGTCTTCTTAATCTCGTATGCCGTCTTCTGCTTGAAAATTGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG A sequence In the reverse ( R2 ) file: TGATCCTTCTGCAGGTTCACCTACGGAAACCTTGTTACGACTTCTCCTTCCTCTAGGTGATATGGTTTACTTATTTTTCCGAAAAACGGTCCAAAAGGTTCACCGGATCACCCGGTATCGGTAGGAGCGACGGGCGGTGTGTACTGTAGAACCATGTCGTCAGTGTAGATCTCGGTGGTCGCCGTATCATTAAAAAACGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG I wish to remove the primers to…

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qiime2-import data from non-working directory – User Support

Hello, qiime2 users community! I have the following set-up: a huge collection of .fastq files which I would like to process with the dada2 pipeline a remote cluster of servers with the separated storage where those files are stored, and the working machines for computing. Question: Is it possible to…

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Issue with installing QIIME2 2021.11 on Windows 10 – Technical Support

Hi QIIME support team, I’m attempting to install QIIME2 on my Windows 10 machine. I installed Anaconda3, then set up conda to run in Git Bash: echo “. ${PWD}/conda.sh” >> ~/.bashrc Once I restarted Git Bash and activated Conda, I installed python-wget because installation of wget kept getting the following…

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Which files from PacBio output files to use in downstream analysis in R

Which files from PacBio output files to use in downstream analysis in R 0 I just received Pacbio sequences of 16S gene from the core facility. After download, I got 5 files for each sample with following suffix: .ccs.bam longest.bam scraps.bam subreads.bam whitelist From readings, I believe that I should…

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How to map SILVA taxa names to NCBI IDs (in R)?

How to map SILVA taxa names to NCBI IDs (in R)? 0 Hi, How to map taxonomy assigned using SILVA database to NCBI ID (preferably in R)? I’m using R Dada2 and SILVA database to assign taxonomy: Bacteria > Firmicutes > Bacilli > Lactobacillales > Enterococcaceae > Enterococcus I need…

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