Ensembl genome database project is a scientific project at the European Bioinformatics Institute, which provides a centralized resource for geneticists, molecular biologists and other researchers studying the genomes of our own species and other vertebrates and

model organism A model organism (often shortened to model) is a non-human species that is extensively studied to understand particular biological phenomena, with the expectation that discoveries made in the model organism will provide insight into the workin ...

s. Ensembl is one of several well known genome browsers for the retrieval of

genomic Genomics is an interdisciplinary field of biology focusing on the structure, function, evolution, mapping, and editing of genomes. A genome is an organism's complete set of DNA, including all of its genes as well as its hierarchical, three-dim ...

information. Similar databases and browsers are found at NCBI and the University of California, Santa Cruz (UCSC).

History

The human genome consists of three billion

base pair A base pair (bp) is a fundamental unit of double-stranded nucleic acids consisting of two nucleobases bound to each other by hydrogen bonds. They form the building blocks of the DNA double helix and contribute to the folded structure of both DNA ...

s, which code for approximately 20,000–25,000 genes. However the genome alone is of little use, unless the locations and relationships of individual genes can be identified. One option is manual annotation, whereby a team of scientists tries to locate genes using experimental data from scientific journals and public databases. However this is a slow, painstaking task. The alternative, known as automated annotation, is to use the power of computers to do the complex

pattern-matching In computer science, pattern matching is the act of checking a given sequence of tokens for the presence of the constituents of some pattern. In contrast to pattern recognition, the match usually has to be exact: "either it will or will not be ...

of protein to DNA. The Ensembl project was launched in 1999 in response to the imminent completion of the

Human Genome Project The Human Genome Project (HGP) was an international scientific research project with the goal of determining the base pairs that make up human DNA, and of identifying, mapping and sequencing all of the genes of the human genome from both a ...

, with the initial goals of automatically annotate the human genome, integrate this annotation with available biological data and make all this knowledge publicly available. In the Ensembl project, sequence data are fed into the gene annotation system (a collection of software "pipelines" written in Perl) which creates a set of predicted gene locations and saves them in a MySQL database for subsequent analysis and display. Ensembl makes these data freely accessible to the world research community. All the data and code produced by the Ensembl project is available to download, and there is also a publicly accessible database server allowing remote access. In addition, the Ensembl website provides computer-generated visual displays of much of the data. Over time the project has expanded to include additional species (including key model organisms such as

mouse A mouse ( : mice) is a small rodent. Characteristically, mice are known to have a pointed snout, small rounded ears, a body-length scaly tail, and a high breeding rate. The best known mouse species is the common house mouse (''Mus musculus' ...

, fruitfly and zebrafish) as well as a wider range of genomic data, including

genetic variation Genetic variation is the difference in DNA among individuals or the differences between populations. The multiple sources of genetic variation include mutation and genetic recombination. Mutations are the ultimate sources of genetic variation, ...

s and regulatory features. Since April 2009, a sister project, Ensembl Genomes, has extended the scope of Ensembl into invertebrate metazoa, plants, fungi, bacteria, and

protists A protist () is any eukaryotic organism (that is, an organism whose cells contain a cell nucleus) that is not an animal, plant, or fungus. While it is likely that protists share a common ancestor (the last eukaryotic common ancestor), the excl ...

, focusing on providing taxonomic and evolutionary context to genes, whilst the original project continues to focus on vertebrates. As of 2020, Ensembl supported over 50 000 genomes across both Ensembl and Ensembl Genomes databases, adding some new innovative features such a
Rapid Release
a new website designed to make genome annotation data available more quickly to users, an

a new website to access to SARS-CoV-2 reference genome.

Displaying genomic data

Central to the Ensembl concept is the ability to automatically generate graphical views of the alignment of genes and other genomic data against a

reference genome A reference genome (also known as a reference assembly) is a digital nucleic acid sequence database, assembled by scientists as a representative example of the set of genes in one idealized individual organism of a species. As they are assemble ...

. These are shown as data tracks, and individual tracks can be turned on and off, allowing the user to customise the display to suit their research interests. The interface also enables the user to zoom in to a region or move along the genome in either direction. Other displays show data at varying levels of resolution, from whole

karyotype A karyotype is the general appearance of the complete set of metaphase chromosomes in the cells of a species or in an individual organism, mainly including their sizes, numbers, and shapes. Karyotyping is the process by which a karyotype is disce ...

s down to text-based representations of DNA and amino acid sequences, or present other types of display such as trees of similar genes ( homologues) across a range of species. The graphics are complemented by tabular displays, and in many cases data can be exported directly from the page in a variety of standard file formats such as FASTA. Externally produced data can also be added to the display by uploading a suitable file in one of the supported formats, such as BAM, BED, or

PSL PSL may refer to: Sport *Pakistan Super League, a Twenty20 cricket league in Pakistan *Philippine Super Liga, professional volleyball league in the Philippines *Pilipinas Super League, a professional basketball league in the Philippines * Philipp ...

. Graphics are generated using a suite of custom Perl modules based on GD, the standard Perl graphics display library.

Alternative access methods

In addition to its website, Ensembl provides a REST API and a Perl API (Application Programming Interface) that models biological objects such as genes and proteins, allowing simple

script Script may refer to: Writing systems * Script, a distinctive writing system, based on a repertoire of specific elements or symbols, or that repertoire * Script (styles of handwriting) ** Script typeface, a typeface with characteristics of handw ...

s to be written to retrieve data of interest. The same API is used internally by the web interface to display the data. It is divided in sections like the core API, the compara API (for

comparative genomics Comparative genomics is a field of biological research in which the genomic features of different organisms are compared. The genomic features may include the DNA sequence, genes, gene order, regulatory sequences, and other genomic structural lan ...

data), the variation API (for accessing SNPs, SNVs, CNVs..), and the functional genomics API (to access regulatory data). The Ensembl website provides extensive information o
how to install and use the API
This software can be used to access the public MySQL database, avoiding the need to download enormous datasets. The users could even choose to retrieve data from the MySQL with direct SQL queries, but this requires an extensive knowledge of the current database schema. Large datasets can be retrieved using the BioMart data-mining tool. It provides a web interface for downloading datasets using complex queries. Last, there is a
FTP
server which can be used to download entire MySQL databases as well some selected data sets in other formats.

Current species

The annotated genomes include most fully sequenced vertebrates and selected model organisms. All of them are eukaryotes, there are no prokaryotes. As of 2022, there are 271 species registered, this includes:

Open source/mirrors

All data part of the Ensembl project is open access and all software is open source, being freely available to the scientific community, under a

CC BY 4.0 A Creative Commons (CC) license is one of several public copyright licenses that enable the free distribution of an otherwise copyrighted "work".A "work" is any creative material made by a person. A painting, a graphic, a book, a song/lyric ...

license. Currently, Ensembl database website is mirrored at four different locations worldwide to improve the service.

References

External links

*
VegaPre-EnsemblEnsembl genomesUCSC Genome BrowserNCBIEnsembl: Browsing chordate genomes on EBI Train OnLine
{{Authority control Genetic engineering in the United Kingdom Genome databases Medical databases in the United Kingdom Medical genetics Science and technology in Cambridgeshire South Cambridgeshire District Wellcome Trust Biological databases Bioinformatics Computational biology