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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.

Next-generation Sequencing

Next-generation Sequencing

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.
Next-Generation Sequencing Methods
Although all next-generation methods use different technologies, they all share a set of standard features.

Genome Size and the Evolution of New Genes

Genome Size and the Evolution of New Genes

While every living organism has a genome of some kind (be it RNA, or DNA), there is considerable variation in the sizes of these blueprints. One major factor that impacts genome size is whether the organism is prokaryotic or eukaryotic. In prokaryotes, the genome contains little to no non-coding sequence, such that genes are tightly clustered in groups or operons sequentially along the chromosome. Conversely, the genes in eukaryotes are punctuated by long stretches of non-coding sequence.

Genome Size and the Evolution of New Genes

Genome Size and the Evolution of New Genes

While every living organism has a genome of some kind (be it RNA, or DNA), there is considerable variation in the sizes of these blueprints. One major factor that impacts genome size is whether the organism is prokaryotic or eukaryotic. In prokaryotes, the genome contains little to no non-coding sequence, such that genes are tightly clustered in groups or operons sequentially along the chromosome. Conversely, the genes in eukaryotes are punctuated by long stretches of non-coding sequence.

Multi-species Conserved Sequences

Multi-species Conserved Sequences

Next-generation sequencing technologies have created large genomic databases of a variety of animals and plants. Ever since the human genome project was completed, scientists studied the genome of primates, mammals, and other phylogenetically distant living beings. Such large-scale studies have provided new insights into the evolutionary relationship between organisms.
Although the genome of each species varies greatly from each other, a few sequences are highly conserved. Such conserved DNA...

Maxam-Gilbert Sequencing

Maxam-Gilbert Sequencing

In the same year as the discovery of the Sanger sequencing method, another group of scientists, Allan Maxam and Walter Gilbert, demonstrated their chemical-cleavage method for DNA sequencing. The Maxam-Gilbert method relies on using different chemicals that can cleave the DNA sequence at specific sites, the separation of resulting DNA fragments of variable size using electrophoresis, and deciphering the DNA sequence from the resulting gel bands.
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Related Experiment Video

Updated: May 12, 2026

Novel Sequence Discovery by Subtractive Genomics

Novel Sequence Discovery by Subtractive Genomics

Published on: January 25, 2019

Agaricus bisporus genome sequence: a commentary.

Richard W Kerrigan¹, Michael P Challen, Kerry S Burton

¹Sylvan Biosciences, 198 Nolte Drive, Kittanning, PA 16201, USA.

Fungal Genetics and Biology : FG & B

|April 6, 2013

Summary

This summary is machine-generated.

The genome sequencing of Agaricus bisporus reveals a new

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Area of Science:

Mycology
Genomics
Biochemistry

Background:

Agaricus bisporus, a widely cultivated edible mushroom, has resisted traditional classification as a white- or brown-rot fungus.
Industrial cultivation of this soil-inhabiting fungus has an annual worldwide value of $4.7 billion.

Purpose of the Study:

To classify Agaricus bisporus based on its genomic and transcriptomic data.
To identify genes and genetic elements associated with its unique growth adaptation.

Main Methods:

Genome sequencing of two Agaricus bisporus isolates.
Transcriptomic analyses under varying substrate conditions.
Bioinformatic analysis of gene content and regulatory elements.

Main Results:

A new classification, 'humicolous', is proposed for Agaricus bisporus, indicating adaptation to humic-rich environments.
The genome contains polysaccharide and lignin-degrading genes, with an expanded repertoire of lignin derivative-degrading enzymes.
A novel promoter motif is identified in genes upregulated on humic substrates.

Conclusions:

The genome sequence provides a platform for understanding fungal biology in carbon-rich soils.
This research enhances our understanding of terrestrial nutrient cycling.
The findings offer insights into the unique ecological niche and industrial potential of Agaricus bisporus.