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Genome Annotation and Assembly03:36

Genome Annotation and Assembly

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The genome refers to all of the genetic material in an organism. It can range from a few million base pairs in microbial cells to several billion base pairs in many eukaryotic organisms. Genome assembly refers to the process of taking the DNA sequencing data and putting it all back together in a correct order to create a close representation of the original genome. This is followed by the identification of functional elements on the newly assembled genome, a process called genome annotation.
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RNA sequencing, or RNA-Seq, is a high-throughput sequencing technology used to study the transcriptome of a cell. Transcriptomics helps to interpret the functional elements of a genome and identify the molecular constituents of an organism. Additionally, it also helps in understanding the development of an organism and the occurrence of diseases. 
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DNA sequencing is a fundamental technique that is routinely used in the biological sciences. This method can be applied to a range of questions at different scales - from the sequencing of a cloned DNA fragment or the study of a mutation in a gene up to whole-genome sequencing. However, despite the widespread use of sequencing today, it was not until 1977 that Fredrick Sanger and his collaborators developed the chain-termination method to decode DNA sequences. It relies on the separation of a...
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The first human genome sequencing project cost $2.7 billion and was declared complete in 2003, after 15 years of international cooperation and collaboration between several research teams and funding agencies. Today, with the advent of next-generation sequencing technologies, the cost and time of sequencing a human genome have dropped over 100 fold.
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Updated: Dec 12, 2025

Nanopore DNA Sequencing for Metagenomic Soil Analysis
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Nanopore DNA Sequencing for Metagenomic Soil Analysis

Published on: December 14, 2017

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Assembly methods for nanopore-based metagenomic sequencing: a comparative study.

Adriel Latorre-Pérez1, Pascual Villalba-Bermell1, Javier Pascual1

  • 1Darwin Bioprospecting Excellence S.L., Paterna, Spain.

Scientific Reports
|August 14, 2020
PubMed
Summary

Long-read nanopore sequencing effectively reconstructs microbial genomes from metagenomic data. Tools like metaFlye, Raven, and Canu yield accurate, contiguous assemblies, even for complex communities.

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Area of Science:

  • Microbial genomics
  • Bioinformatics
  • Metagenomics

Background:

  • Metagenomic sequencing enables the study of uncultured microbes.
  • Short-read sequencing often produces fragmented assemblies.
  • Long-read nanopore sequencing offers potential for more contiguous metagenomic assemblies.

Purpose of the Study:

  • To systematically evaluate nanopore sequencing assembly tools for metagenomic data.
  • To benchmark assembler performance on mock microbial communities using Oxford Nanopore Technologies.

Main Methods:

  • Sequencing of two commercial mock microbial communities using Oxford Nanopore Technologies.
  • Benchmarking of multiple assembly tools, including metaFlye, Raven, and Canu.
  • Evaluation of assembly contiguity, accuracy, and the impact of polishing strategies.

Main Results:

  • MetaFlye, Raven, and Canu demonstrated robust performance, yielding highly contiguous and accurate (99.5-99.8% consensus accuracy) genome assemblies.
  • Polishing strategies were crucial for indel reduction, impacting downstream analyses like biosynthetic gene cluster prediction.
  • High-quality short-read correction did not consistently improve draft assembly quality.

Conclusions:

  • Nanopore sequencing data, particularly from MinION, is sufficient for assembling and characterizing low-complexity microbial communities.
  • Specific assemblers (metaFlye, Raven, Canu) are recommended for nanopore-based metagenomic assembly.
  • Post-assembly polishing is essential for optimizing genome quality and downstream functional predictions.