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Genome Annotation and Assembly

Genome Annotation and Assembly

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.

RNA-seq

RNA-seq

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.
Before the discovery of RNA-seq, microarray-based methods and Sanger sequencing were used for transcriptome analysis. However, while...

Sanger Sequencing

Sanger Sequencing

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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Related Experiment Video

Updated: Nov 13, 2025

Metagenomic Analysis of Silage

Metagenomic Analysis of Silage

Published on: January 13, 2017

Long-read sequence assembly: a technical evaluation in barley.

Martin Mascher^1,2, Thomas Wicker³, Jerry Jenkins⁴

¹Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Gatersleben, Seeland 06466, Germany.

|March 12, 2021

Summary

This summary is machine-generated.

Accurate long-read sequencing, particularly circular consensus sequencing (CCS), offers a cost-effective method for assembling plant genomes. This approach significantly improves sequence contiguity and gene representation for large, repeat-rich species like barley.

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Hybrid De Novo Genome Assembly for the Generation of Complete Genomes of Urinary Bacteria using Short- and Long-read Sequencing Technologies

Hybrid De Novo Genome Assembly for the Generation of Complete Genomes of Urinary Bacteria using Short- and Long-read Sequencing Technologies

Published on: August 20, 2021

Area of Science:

Genomics
Plant Biology
Bioinformatics

Background:

Assembling large, repeat-rich plant genomes presents significant computational challenges.
Traditional short-read sequencing often results in fragmented assemblies, limiting pan-genome studies.
Advancements in long-read sequencing, such as PacBio's circular consensus sequencing (CCS), offer potential solutions.

Purpose of the Study:

To compare the efficacy of current long-read sequencing platforms for rapid, contiguous sequence assembly in plant pan-genome studies.
To evaluate the cost-effectiveness of different long-read strategies for assembling multiple barley genomes.
To assess the required sequencing coverage for achieving high-quality genome assemblies.

Main Methods:

Comparative analysis of sequence assembly performance across different long-read sequencing platforms (PacBio CCS, etc.).
Downsampling analysis of circular consensus sequencing (CCS) data to determine optimal coverage levels.
Generation of an updated reference genome assembly for barley (Hordeum vulgare).

Main Results:

Long-read assemblies significantly outperform current short-read based barley reference sequences in contiguity and completeness.
Circular consensus sequencing (CCS) emerged as the most cost-effective strategy for assembling numerous barley genomes.
High-quality assemblies can be achieved with as little as 20-fold CCS coverage, with five-fold coverage capturing most genes.
An updated barley reference genome with improved representation of repeat-rich intergenic regions was generated.

Conclusions:

Accurate long-read sequencing, especially CCS, is a powerful and cost-effective tool for plant pan-genome projects.
This technology enables the construction of complete and accurate genome sequences for multiple accessions within a species.
It provides a foundation for building robust pan-genome infrastructures in Triticeae crops and related species.