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{{Short description|Discipline in genetics}}
{{About|the scientific field|the journal|Genomics (journal)}}
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'''Genomics''' is an interdisciplinary field of [[molecular biology]] focusing on the structure, function, evolution, mapping, and editing of [[genome]]s. A genome is an organism's complete set of [[DNA]], including all of its genes as well as its hierarchical, three-dimensional structural configuration.<ref name = "Franklin_1953" /><ref name = "Satzinger_2008" /><ref name = "Cremer_2006" /><ref>{{cite journal |last1=Rossi |first1=M.J |last2=Kuntala |first2=P.K |last3=Lai |first3=W.K.M |last4=Yamada |first4=N |last5=Badjatia |first5=N |last6=Mittal |first6=C |last7=Kuzu |first7=G |last8=Bocklund |first8=K |last9=Farrell |first9=N.P |last10=Blanda |first10=T.R |last11=Mairose |first11=J.D |last12=Basting |first12=A.V |last13=Mistretta |first13=K.S |last14=Rocco |first14=D.J |last15=Perkinson |first15=E.S |last16=Kellogg |first16=G.D |last17=Mahony |first17=S |last18=Pugh |first18=B.F |title=A high-resolution protein architecture of the budding yeast genome |journal=Nature |date=March 2021 |volume=592 |issue=7853 |pages=309–314 |doi=10.1038/s41586-021-03314-8 |pmid=33692541 |pmc=8035251 |bibcode=2021Natur.592..309R}}</ref>{{overcite|date=November 2024}} In contrast to [[genetics]], which refers to the study of ''individual'' genes and their roles in inheritance, genomics aims at the collective characterization and quantification of ''all'' of an organism's genes, their interrelations and influence on the organism.<ref name = "WHO_2004" /> Genes may direct the production of [[proteins]] with the assistance of enzymes and messenger molecules. In turn, proteins make up body structures such as organs and tissues as well as control chemical reactions and carry signals between cells. Genomics also involves the sequencing and analysis of genomes through uses of high throughput [[DNA sequencing]] and [[bioinformatics]] to assemble and analyze the function and structure of entire genomes.<ref name = "Klug_2012"/><ref name = "Culver_2002"/> Advances in genomics have triggered a revolution in discovery-based research and [[systems biology]] to facilitate understanding of even the most complex biological systems such as the brain.<ref name = "Kadakkuzha_2013"/>

The field also includes studies of intragenomic (within the genome) phenomena such as [[epistasis]] (effect of one gene on another), [[pleiotropy]] (one gene affecting more than one trait), [[heterosis]] (hybrid vigour), and other interactions between [[Locus (genetics)|loci]] and [[allele]]s within the genome.<ref name = "Pevsner_2009"/>

== History ==

=== Etymology ===
From the Greek ΓΕΝ<ref name = "Liddell_2013" /> ''gen'', "gene" (gamma, epsilon, nu, epsilon) meaning "become, create, creation, birth", and subsequent variants: genealogy, genesis, genetics, genic, genomere, genotype, genus etc. While the word ''genome'' (from the [[German language|German]] ''Genom'', attributed to [[Hans Winkler]]) was in use in [[English language|English]] as early as 1926,<ref name = "OED_Genome"/> the term ''genomics'' was coined by Tom Roderick, a [[geneticist]] at the [[Jackson Laboratory]] ([[Bar Harbor, Maine]]), over beers with [[James E. Womack]], Tom Shows and [[Stephen J. O'Brien|Stephen O'Brien]] at a meeting held in [[Maryland]] on the mapping of the human genome in 1986.<ref name = "Yadav_2007"/> First as the name for a [[Genomics (journal)|new journal]] and then as a whole new science discipline.<ref name = "O'Brien_2022" />

=== Early sequencing efforts ===
Following [[Rosalind Franklin]]'s confirmation of the helical structure of DNA, [[James D. Watson]] and [[Francis Crick]]'s publication of the structure of DNA in 1953 and [[Fred Sanger]]'s publication of the [[Amino acid]] sequence of insulin in 1955, nucleic acid sequencing became a major target of early [[molecular biology|molecular biologists]].<ref name = "Ankeny_2003"/> In 1964, [[Robert W. Holley]] and colleagues published the first nucleic acid sequence ever determined, the [[ribonucleic acid|ribonucleotide]] sequence of [[alanine]] [[tRNA|transfer RNA]].<ref name = "Holley_1965a"/><ref name = "Holley_1965b"/> Extending this work, [[Marshall Nirenberg]] and [[Philip Leder]] revealed the triplet nature of the [[genetic code]] and were able to determine the sequences of 54 out of 64 [[codons]] in their experiments.<ref name = "Nuremberg_1965"/> In 1972, [[Walter Fiers]] and his team at the Laboratory of Molecular Biology of the [[University of Ghent]] ([[Ghent]], [[Belgium]]) were the first to determine the sequence of a gene: the gene for [[Bacteriophage MS2]] coat protein.<ref name = "Min_1972"/> Fiers' group expanded on their MS2 coat protein work, determining the complete nucleotide-sequence of bacteriophage MS2-RNA (whose genome encodes just four genes in 3569 [[base pair]]s &#91;bp&#93;) and [[SV40|Simian virus 40]] in 1976 and 1978, respectively.<ref name = "Fiers_1976"/><ref name = "Fiers_1978"/>

=== DNA-sequencing technology developed ===
{{multiple image
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| image1 = Frederick Sanger2.jpg
| caption1 = Frederick Sanger
| image2 = WalterGilbert2.jpg
| caption2 = Walter Gilbert
| footer = [[Frederick Sanger]] and [[Walter Gilbert]] shared half of the 1980 Nobel Prize in Chemistry for Independently developing methods for the sequencing of DNA.
}}

In addition to his seminal work on the amino acid sequence of insulin, [[Frederick Sanger]] and his colleagues played a key role in the development of DNA sequencing techniques that enabled the establishment of comprehensive genome sequencing projects.<ref name = "Pevsner_2009"/> In 1975, he and Alan Coulson published a sequencing procedure using DNA polymerase with radiolabelled nucleotides that he called the ''Plus and Minus technique''.<ref name = "Tamarin_2004"/><ref name = "Sanger_1980"/> This involved two closely related methods that generated short oligonucleotides with defined 3' termini. These could be fractionated by [[electrophoresis]] on a [[polyacrylamide]] gel (called polyacrylamide gel electrophoresis) and visualised using autoradiography. The procedure could sequence up to 80 nucleotides in one go and was a big improvement, but was still very laborious.  Nevertheless, in 1977 his group was able to sequence most of the 5,386 nucleotides of the single-stranded [[bacteriophage]] [[Phi X 174|φX174]], completing the first fully sequenced DNA-based genome.<ref name = "Sanger_1977"/> The refinement of the ''Plus and Minus'' method resulted in the chain-termination, or [[Sanger method]] (see [[#Shotgun sequencing|below]]), which formed the basis of the techniques of DNA sequencing, genome mapping, data storage, and bioinformatic analysis most widely used in the following quarter-century of research.<ref name = "Kaiser_2003"/><ref name = "Sanger_1977a"/> In the same year [[Walter Gilbert]] and [[Allan Maxam]] of [[Harvard University]] independently developed the [[Maxam-Gilbert sequencing|Maxam-Gilbert]] method (also known as the ''chemical method'') of DNA sequencing, involving the preferential cleavage of DNA at known bases, a less efficient method.<ref name = "Gilbert_1977"/><ref name = "Darden_2010"/> For their groundbreaking work in the sequencing of nucleic acids, Gilbert and Sanger shared half the 1980 [[Nobel Prize]] in chemistry with [[Paul Berg]] ([[recombinant DNA]]).

=== Complete genomes ===
The advent of these technologies resulted in a rapid intensification in the scope and speed of completion of [[Genome project|genome sequencing projects]]. The first complete genome sequence of a [[eukaryotic organelle]], the human [[mitochondrion]] (16,568 bp, about 16.6 kb &#91;kilobase&#93;), was reported in 1981,<ref name = "Anderson_1981"/> and the first [[chloroplast]] genomes followed in 1986.<ref name = "Shinozaki_1986"/><ref name = "Ohyama_1986"/> In 1992, the first eukaryotic [[chromosome]], chromosome III of brewer's yeast ''[[Saccharomyces cerevisiae]]'' (315 kb) was sequenced.<ref name = "Oliver_1992"/> The first free-living organism to be sequenced was that of ''[[Haemophilus influenzae]]'' (1.8 Mb &#91;megabase&#93;) in 1995.<ref name = "Fleischmann_1995"/> The following year a consortium of researchers from laboratories across [[North America]], [[Europe]], and [[Japan]] announced the completion of the first complete genome sequence of a eukaryote, ''[[Saccharomyces cerevisiae|S. cerevisiae]]'' (12.1 Mb), and since then genomes have continued being sequenced at an exponentially growing pace.<ref name = "Goffeau_1996"/> {{As of|2011|October}}, the complete sequences are available for: 2,719 [[virus]]es, 1,115 [[archaea]] and [[bacteria]], and 36 [[eukaryote]]s, of which about half are [[fungi]].<ref name = "Viruses_2011"/><ref name = "Entrez_2011"/>

[[File:Number of prokaryotic genomes and sequencing costs.svg|left|thumb|300px|The number of genome projects has increased as technological improvements continue to lower the cost of sequencing. '''(A)''' Exponential growth of genome sequence databases since 1995. '''(B)''' The cost in US Dollars (USD) to sequence one million bases. '''(C)''' The cost in USD to sequence a 3,000 Mb (human-sized) genome on a log-transformed scale.|alt="Hockey stick" graph showing the exponential growth of public sequence databases.]]

Most of the microorganisms whose genomes have been completely sequenced are problematic [[pathogen]]s, such as ''[[Haemophilus influenzae]]'', which has resulted in a pronounced bias in their phylogenetic distribution compared to the breadth of microbial diversity.<ref name = "Zimmer_2009a"/><ref name = "Geba_2009"/> Of the other sequenced species, most were chosen because they were well-studied model organisms or promised to become good models. Yeast (''[[Saccharomyces cerevisiae]]'') has long been an important [[model organism]] for the [[eukaryotic cell]], while the fruit fly ''[[Drosophila melanogaster]]'' has been a very important tool (notably in early pre-molecular [[genetics]]). The worm ''[[Caenorhabditis elegans]]'' is an often used simple model for [[multicellular organism]]s. The zebrafish ''[[Brachydanio rerio]]'' is used for many developmental studies on the molecular level, and the plant ''[[Arabidopsis thaliana]]'' is a model organism for flowering plants.  The [[Japanese pufferfish]] (''[[Takifugu rubripes]]'') and the [[Dichotomyctere nigroviridis|spotted green pufferfish]] (''[[Tetraodon nigroviridis]]'') are interesting because of their small and compact genomes, which contain very little [[noncoding DNA]] compared to most species.<ref name = "BBC_2004"/><ref name = "Yue_2001"/> The mammals dog (''[[Canis familiaris]]''),<ref name = "nhgriDog2004"/> brown rat (''[[Rattus norvegicus]]''), mouse (''[[Mus musculus]]''), and chimpanzee (''[[Pan troglodytes]]'') are all important model animals in medical research.<ref name = "Darden_2010"/>

A rough draft of the [[human genome]] was completed by the [[Human Genome Project]] in early 2001, creating much fanfare.<ref name = "McElheny_2010"/> This project, completed in 2003, sequenced the entire genome for one specific person, and by 2007 this sequence was declared "finished" (less than one error in 20,000 bases and all chromosomes assembled).<ref name = "McElheny_2010"/> In the years since then, the genomes of many other individuals have been sequenced, partly under the auspices of the [[1000 Genomes Project]], which announced the sequencing of 1,092 genomes in October 2012.<ref name = "1000genomes2012"/> Completion of this project was made possible by the development of dramatically more efficient sequencing technologies and required the commitment of significant [[bioinformatics]] resources from a large international collaboration.<ref name = "Neilsen_2012"/> The continued analysis of human genomic data has profound political and social repercussions for human societies.<ref name = "Barnes_2008"/>

=== The "omics" revolution ===
{{Main|Omics|Human proteome project}}
[[Image:Metabolomics schema.png|thumb|General schema showing the relationships of the [[genome]], [[transcriptome]], [[proteome]], and [[metabolome]] ([[lipidome]])]]The English-language [[neologism]] '''omics''' informally refers to a field of study in biology ending in ''-omics'', such as genomics, [[proteomics]] or [[metabolomics]]. The related suffix '''-ome''' is used to address the objects of study of such fields, such as the [[genome]], [[proteome]], or [[metabolome]] ([[lipidome]]) respectively. The suffix ''-ome'' as used in molecular biology refers to a ''totality'' of some sort; similarly '''omics''' has come to refer generally to the study of large, comprehensive biological data sets. While the growth in the use of the term has led some scientists ([[Jonathan Eisen]], among others<ref name = "Eisen_2012"/>) to claim that it has been oversold,<ref name = "wsj_2012"/> it reflects the change in orientation towards the quantitative analysis of complete or near-complete assortment of all the constituents of a system.<ref name = "Scudellari_2011" /> In the study of [[Symbiosis|symbioses]], for example, researchers which were once limited to the study of a single gene product can now simultaneously compare the total complement of several types of biological molecules.<ref name = "Chaston_2012"/><ref name = "McCutcheon_2011"/>

== Genome analysis ==
{{Main|Genome project}}

After an organism has been selected, genome projects involve three components: the sequencing of DNA, the assembly of that sequence to create a representation of the original chromosome, and the annotation and analysis of that representation.<ref name = "Pevsner_2009"/>
[[File:Genome sequencing project flowchart.svg|thumb|300px|Overview of a genome project. First, the genome must be selected, which involves several factors including cost and relevance. Second, the sequence is generated and assembled at a given sequencing center (such as [[Beijing Genomics Institute|BGI]] or [[DOE Joint Genome Institute|DOE JGI]]). Third, the genome sequence is annotated at several levels: DNA, protein, gene pathways, or comparatively.]]

=== Sequencing ===
{{Main|DNA Sequencing}}

Historically, sequencing was done in ''sequencing centers'', centralized facilities (ranging from large independent institutions such as [[Joint Genome Institute]] which sequence dozens of terabases a year, to local molecular biology core facilities)  which contain research laboratories with the costly instrumentation and technical support necessary. As sequencing technology continues to improve, however, a new generation of effective fast turnaround benchtop sequencers has come within reach of the average academic laboratory.<ref name = "Baker_2012_Blog"/><ref name = "Quail_2012"/> On the whole, genome sequencing approaches fall into two broad categories, ''shotgun'' and ''high-throughput'' (or ''next-generation'') sequencing.<ref name = "Pevsner_2009"/>

==== Shotgun sequencing ====
{{Main|Shotgun sequencing}}
<!-- [[File:Sanger-sequencing.svg|thumb|upright=1.5|The Sanger (chain-termination) method for DNA sequencing.]] -->

[[Image:ABI PRISM 3100 Genetic Analyzer 3.jpg|left|thumbnail|An ABI PRISM 3100 Genetic Analyzer. Such capillary sequencers automated early large-scale genome sequencing efforts.]]Shotgun sequencing is a sequencing method designed for analysis of DNA sequences longer than 1000 base pairs, up to and including entire chromosomes.<ref name = "Staden_1979" /> It is named by analogy with the rapidly expanding, quasi-random firing pattern of a [[shotgun]]. Since gel electrophoresis sequencing can only be used for fairly short sequences (100 to 1000 base pairs), longer DNA sequences must be broken into random small segments which are then sequenced to obtain ''reads''. Multiple overlapping reads for the target DNA are obtained by performing several rounds of this fragmentation and sequencing. Computer programs then use the overlapping ends of different reads to assemble them into a continuous sequence.<ref name = "Staden_1979"/><ref name = "Anderson_1981a"/>  Shotgun sequencing is a random sampling process, requiring over-sampling to ensure a given [[nucleotide]] is represented in the reconstructed sequence; the average number of reads by which a genome is over-sampled is referred to as [[Shotgun sequencing#Coverage|coverage]].<ref name = "Pop_2008"/>

For much of its history, the technology underlying shotgun sequencing was the classical chain-termination method or '[[Sanger sequencing|Sanger method]]', which is based on the selective incorporation of chain-terminating [[dideoxynucleotide]]s by [[DNA polymerase]] during [[in vitro]] [[DNA replication]].<ref name = "Sanger_1977"/><ref name = "Sanger_1975"/> Recently, shotgun sequencing has been supplanted by [[Dna sequencing#Next-generation methods|high-throughput sequencing]] methods, especially for large-scale, automated [[genome]] analyses. However, the Sanger method remains in wide use, primarily for smaller-scale projects and for obtaining especially long contiguous DNA sequence reads (>500 nucleotides).<ref name=Mavro_2012/> Chain-termination methods require a single-stranded DNA template, a DNA [[primer (molecular biology)|primer]], a [[DNA polymerase]], normal deoxynucleosidetriphosphates (dNTPs), and modified nucleotides (dideoxyNTPs) that terminate DNA strand elongation. These chain-terminating nucleotides lack a 3'-[[hydroxyl|OH]] group required for the formation of a [[phosphodiester bond]] between two nucleotides, causing DNA polymerase to cease extension of DNA when a ddNTP is incorporated. The ddNTPs may be radioactively or [[fluorescence|fluorescently]] labelled for detection in [[DNA sequencer]]s.<ref name=Pevsner_2009/> Typically, these machines can sequence up to 96 DNA samples in a single batch (run) in up to 48 runs a day.<ref name = "illumina2012"/>

==== High-throughput sequencing ====
{{See also|Illumina dye sequencing|Ion semiconductor sequencing}}
The high demand for low-cost sequencing has driven the development of high-throughput sequencing technologies that [[multiplex (assay)|parallelize]] the sequencing process, producing thousands or millions of sequences at once.<ref name = "Hall_2007"/><ref name = "Church_2005"/> High-throughput sequencing is intended to lower the cost of DNA sequencing beyond what is possible with standard dye-terminator methods. In ultra-high-throughput sequencing, as many as 500,000 sequencing-by-synthesis operations may be run in parallel.<ref name = "tenBosch2008"/><ref name = "Tucker_2009"/>

[[File:Illumina Genome Analyzer II System.jpg|thumb|Illumina Genome Analyzer II System. Illumina technologies have set the standard for high-throughput massively parallel sequencing.<ref name = "Baker_2012_Blog"/>]]
The Illumina dye sequencing method is based on reversible dye-terminators and was developed in 1996 at the Geneva Biomedical Research Institute, by [[Pascal Mayer]] and Laurent Farinelli.<ref name = "DNA_colony_patents"/> In this method, DNA molecules and primers are first attached on a slide and amplified with [[polymerase]] so that local clonal colonies, initially coined "DNA colonies", are formed. To determine the sequence, four types of reversible terminator bases (RT-bases) are added and non-incorporated nucleotides are washed away. Unlike pyrosequencing, the DNA chains are extended one nucleotide at a time and image acquisition can be performed at a delayed moment, allowing for very large arrays of DNA colonies to be captured by sequential images taken from a single camera. Decoupling the enzymatic reaction and the image capture allows for optimal throughput and theoretically unlimited sequencing capacity; with an optimal configuration, the ultimate throughput of the instrument depends only on the [[Analog-to-digital converter|A/D conversion]] rate of the camera. The camera takes images of the [[Fluorescent labeling|fluorescently labeled]] nucleotides, then the dye along with the terminal 3' blocker is chemically removed from the DNA, allowing the next cycle.<ref name = "Mardis_2008"/>

An alternative approach, ion semiconductor sequencing, is based on standard DNA replication chemistry. This technology measures the release of a hydrogen ion each time a base is incorporated. A microwell containing template DNA is flooded with a single [[nucleotide]], if the nucleotide is complementary to the template strand it will be incorporated and a hydrogen ion will be released. This release triggers an [[ISFET]] ion sensor. If a [[homopolymer]] is present in the template sequence multiple nucleotides will be incorporated in a single flood cycle, and the detected electrical signal will be proportionally higher.<ref name = "Davies_2011" />

=== Assembly ===
{{Main|Sequence assembly}}

{{multiple image
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| align             = right
| width             = 300
| image1            = PET contig scaffold.png
| caption1          = Overlapping reads form contigs; contigs and gaps of known length form scaffolds.
| image2            = Mapping Reads.png
| caption2          = Paired end reads of next generation sequencing data mapped to a reference genome.
| footer            = Multiple, fragmented sequence reads must be assembled together on the basis of their overlapping areas.
}}

Sequence assembly refers to [[sequence alignment|aligning]] and merging fragments of a much longer [[DNA]] sequence in order to reconstruct the original sequence.<ref name = "Pevsner_2009"/> This is needed as current [[DNA sequencing]] technology cannot read whole genomes as a continuous sequence, but rather reads small pieces of between 20 and 1000 bases, depending on the technology used. Third generation sequencing technologies such as PacBio or Oxford Nanopore routinely generate sequencing reads 10-100 kb in length; however, they have a high error rate at approximately 1 percent.<ref name = "PacBio" /><ref name = "nanoporetech" /> Typically the short fragments, called reads, result from [[shotgun sequencing]] [[genome|genomic]] DNA, or [[Transcription (genetics)|gene transcripts]] ([[expressed sequence tag|ESTs]]).<ref name = "Pevsner_2009"/>

==== Assembly approaches ====
Assembly can be broadly categorized into two approaches: ''de novo'' assembly, for genomes which are not similar to any sequenced in the past, and comparative assembly, which uses the existing sequence of a closely related organism as a reference during assembly.<ref name = "Pop_2008"/> Relative to comparative assembly, ''de novo'' assembly is computationally difficult ([[NP-hard]]), making it less favourable for short-read NGS technologies. Within the ''de novo'' assembly paradigm there are two primary strategies for assembly, Eulerian path strategies, and overlap-layout-consensus (OLC) strategies. OLC strategies ultimately try to create a Hamiltonian path through an overlap graph which is an NP-hard problem. Eulerian path strategies are computationally more tractable because they try to find a Eulerian path through a deBruijn graph.<ref name = "Pop_2008"/>

==== Finishing ====
Finished genomes are defined as having a single contiguous sequence with no ambiguities representing each [[Replicon (genetics)|replicon]].<ref name = "Chain_2009"/>

=== Annotation ===
{{Main|Genome annotation}}

The DNA sequence assembly alone is of little value without additional analysis.<ref name = "Pevsner_2009"/> Genome annotation is the process of attaching biological information to [[DNA sequence|sequences]], and consists of three main steps:<ref name = "Stein_2001"/>
# identifying portions of the genome that do not code for proteins
# identifying elements on the [[genome]], a process called [[gene prediction]], and
# attaching biological information to these elements.
Automatic annotation tools try to perform these steps ''[[in silico]]'', as opposed to manual annotation (a.k.a. curation) which involves human expertise and potential experimental verification.<ref name = "Brent_2008"/> Ideally, these approaches co-exist and complement each other in the same annotation [[Pipeline (computing)|pipeline]] (also see [[#Sequencing pipelines|below]]).

Traditionally, the basic level of annotation is using [[BLAST (biotechnology)|BLAST]] for finding similarities, and then annotating genomes based on homologues.<ref name = "Pevsner_2009"/> More recently, additional information is added to the annotation platform. The additional information allows manual annotators to deconvolute discrepancies between genes that are given the same annotation. Some databases use genome context information, similarity scores, experimental data, and integrations of other resources to provide genome annotations through their Subsystems approach. Other databases (e.g. [[Ensembl]]) rely on both curated data sources as well as a range of software tools in their automated genome annotation pipeline.<ref name = "Ensmbl_2013"/> ''Structural annotation'' consists of the identification of genomic elements, primarily [[Open reading frame|ORFs]] and their localisation, or gene structure. ''Functional annotation'' consists of attaching biological information to genomic elements.

=== Sequencing pipelines and databases ===
<!-- [[File:Integrated microbial genomes.jpg|thumb|Genome analysis tools in Integrated Microbial Genomes (v. 2.9) pipeline.]] -->
The need for reproducibility and efficient management of the large amount of data associated with genome projects mean that [[Pipeline (software)|computational pipelines]] have important applications in genomics.<ref name = "Bioinf_Methods"/>

== Research areas ==

=== Functional genomics ===
{{Main|Functional genomics}}

Functional genomics is a field of [[molecular biology]] that attempts to make use of the vast wealth of data produced by genomic projects (such as [[genome project|genome sequencing projects]]) to describe [[gene]] (and [[protein]]) functions and interactions. Functional genomics focuses on the dynamic aspects such as gene [[transcription (genetics)|transcription]], [[translation (biology)|translation]], and [[protein–protein interaction]]s, as opposed to the static aspects of the genomic information such as [[DNA sequence]] or structures. Functional genomics attempts to answer questions about the function of DNA at the levels of genes, RNA transcripts, and protein products. A key characteristic of functional genomics studies is their genome-wide approach to these questions, generally involving high-throughput methods rather than a more traditional "gene-by-gene" approach.

A major branch of genomics is still concerned with [[sequencing]] the genomes of various organisms, but the knowledge of full genomes has created the possibility for the field of [[functional genomics]], mainly concerned with patterns of [[gene expression]] during various conditions. The most important tools here are [[microarray]]s and [[bioinformatics]].

=== Structural genomics ===
{{Main|Structural genomics}}

[[File:Argonne's Midwest Center for Structural Genomics deposits 1,000th protein structure.jpg|An example of a protein structure determined by the Midwest Center for Structural Genomics|thumb|300px]]
Structural genomics seeks to describe the [[Protein Structure|3-dimensional structure]] of every protein encoded by a given [[genome]].<ref name = "Marsden_2007"/><ref name = "Brenner_2000"/> This genome-based approach allows for a high-throughput method of structure determination by a combination of [[protein structure prediction|experimental and modeling approaches]]. The principal difference between structural genomics and [[protein structure prediction|traditional structural prediction]] is that structural genomics attempts to determine the structure of every protein encoded by the genome, rather than focusing on one particular protein. With full-genome sequences available, structure prediction can be done more quickly through a combination of experimental and modeling approaches, especially because the availability of large numbers of sequenced genomes and previously solved protein structures allow scientists to model protein structure on the structures of previously solved homologs. Structural genomics involves taking a large number of approaches to structure determination, including experimental methods using genomic sequences or modeling-based approaches based on sequence or [[homology modeling|structural homology]] to a protein of known structure or based on chemical and physical principles for a protein with no homology to any known structure. As opposed to traditional [[structural biology]], the determination of a [[protein structure]] through a structural genomics effort often (but not always) comes before anything is known regarding the protein function. This raises new challenges in [[structural bioinformatics]], i.e. determining protein function from its [[Three-dimensional space|3D]] structure.<ref name = "Brenner_2001"/>

=== Epigenomics ===
{{Main|Epigenomics}}

Epigenomics is the study of the complete set of [[epigenetic]] modifications on the genetic material of a cell, known as the [[epigenome]].<ref name = "Francis_2011"/>   Epigenetic modifications are reversible modifications on a cell's DNA or histones that affect gene expression without altering the DNA sequence (Russell 2010 p.&nbsp;475).  Two of the most characterized epigenetic modifications are [[DNA methylation]] and [[Epigenetics#DNA methylation and chromatin remodeling|histone modification]].<ref>{{cite journal |last1=Gallego |first1=L.D |last2=Schneider |first2=M |last3=Mittal |first3=C |last4=Romanuska |first4=Anete |last5=Gudino Carrillo |first5=R.M |last6=Schubert |first6=T |last7=Pugh |first7=B.F |last8=Kohler |first8=A |title=Phase separation directs ubiquitination of gene-body nucleosomes |journal=Nature |date=March 2020 |volume=579 |issue=7800 |pages=592–597 |doi=10.1038/s41586-020-2097-z |pmid=32214243 |pmc=7481934 |bibcode=2020Natur.579..592G }}</ref>  Epigenetic modifications play an important role in gene expression and regulation, and are involved in numerous cellular processes such as in [[Epigenetics#Development|differentiation/development]]<ref>{{cite journal |last1=Sams |first1=K.L |last2=Mukai |first2=C |last3=Marks |first3=B.A |last4=Mittal |first4=C |last5=Demeter |first5=E.A |last6=Nelissen |first6=S |last7=Grenier |first7=J.K |last8=Tate |first8=A.E |last9=Ahmed |first9=F |last10=Coonrod |first10=S.A |title=Delayed puberty, gonadotropin abnormalities and subfertility in male Padi2/Padi4 double knockout mice |journal=Reprod Biol Endocrinol |date=October 2022 |volume=20 |issue=1 |page=150 |doi=10.1186/s12958-022-01018-w |pmid=36224627 |pmc=9555066 |doi-access=free }}</ref> and [[Epigenetics#Cancer|tumorigenesis]].<ref name = "Francis_2011"/>  The study of epigenetics on a global level has been made possible only recently through the adaptation of genomic high-throughput assays.<ref name = "Laird_2010"/>

=== Metagenomics ===
{{Main|Metagenomics}}
[[File:Environmental shotgun sequencing.png|thumb|right|upright|Environmental Shotgun Sequencing (ESS) is a key technique in metagenomics. (A) Sampling from habitat; (B) filtering particles, typically by size; (C) Lysis and DNA extraction; (D) cloning and library construction; (E) sequencing the clones; (F) sequence assembly into contigs and scaffolds.]]

Metagenomics is the study of ''metagenomes'', [[genetics|genetic]] material recovered directly from [[Natural environment|environmental]] samples. The broad field may also be referred to as environmental genomics, ecogenomics or community genomics. While traditional [[microbiology]] and microbial [[genome sequencing]] rely upon cultivated [[clone (genetics)|clonal]] [[microbiological culture|cultures]], early environmental gene sequencing cloned specific genes (often the [[16S ribosomal RNA|16S rRNA]] gene) to produce a [[microbial ecology|profile of diversity]] in a natural sample. Such work revealed that the vast majority of [[biodiversity|microbial biodiversity]] had been missed by [[Microbiological culture|cultivation-based]] methods.<ref name = "Hugenholz_1998"/> Recent studies use "shotgun" [[chain termination method|Sanger sequencing]] or massively parallel [[pyrosequencing]] to get largely unbiased samples of all genes from all the members of the sampled communities.<ref name = "Eisen_2007"/> Because of its power to reveal the previously hidden diversity of microscopic life, metagenomics offers a powerful lens for viewing the microbial world that has the potential to revolutionize understanding of the entire living world.<ref name = "Marco_2010"/><ref name = "Marco_2011"/>

=== Model  systems ===

==== Viruses and bacteriophages ====
[[Bacteriophage]]s have played and continue to play a key role in bacterial [[genetics]] and [[molecular biology]]. Historically, they were used to define [[gene]] structure and gene regulation. Also the first [[genome]] to be sequenced was a [[bacteriophage]]. However, bacteriophage research did not lead the genomics revolution, which is clearly dominated by bacterial genomics. Only very recently has the study of bacteriophage genomes become prominent, thereby enabling researchers to understand the mechanisms underlying [[phage]] evolution.  Bacteriophage genome sequences can be obtained through direct sequencing of isolated bacteriophages, but can also be derived as part of microbial genomes. Analysis of bacterial genomes has shown that a substantial amount of microbial DNA consists of [[prophage]] sequences and prophage-like elements.<ref name = "Canchaya_2003"/> A detailed database mining of these sequences offers insights into the role of prophages in shaping the bacterial genome: Overall, this method verified many known bacteriophage groups, making this a useful tool for predicting the relationships of prophages from bacterial genomes.<ref name = "McGrath_2007"/><ref name = "Fouts_2005"/>

==== Cyanobacteria ====
At present there are 24 [[cyanobacteria]] for which a total genome sequence is available. 15 of these cyanobacteria come from the marine environment. These are six ''[[Prochlorococcus]]'' strains, seven marine ''[[Synechococcus]]'' strains, ''[[Trichodesmium erythraeum]]'' IMS101 and ''[[Crocosphaera watsonii]]'' [[WH8501]]. Several studies have demonstrated how these sequences could be used very successfully to infer important ecological and physiological characteristics of marine cyanobacteria. However, there are many more genome projects currently in progress, amongst those there are further ''[[Prochlorococcus]]'' and marine ''[[Synechococcus]]'' isolates, ''[[Acaryochloris]]'' and ''[[Prochloron]]'', the N<sub>2</sub>-fixing filamentous cyanobacteria ''[[Nodularia]] spumigena'', ''[[Lyngbya aestuarii]]'' and ''[[Lyngbya majuscula]]'', as well as [[bacteriophage]]s infecting marine cyanobacteria. Thus, the growing body of genome information can also be tapped in a more general way to address global problems by applying a comparative approach. Some new and exciting examples of progress in this field are the identification of genes for regulatory RNAs, insights into the evolutionary origin of [[photosynthesis]], or estimation of the contribution of [[horizontal gene transfer]] to the genomes that have been analyzed.<ref name = "Herrero_2008"/>

== Applications ==
[[File:Human karyotype with bands and sub-bands.png|thumb|Schematic [[karyotype|karyogram]] of a human, providing a simplified overview of the human genome. It is a graphical representation of the idealized human [[diploid]] karyotype, with annotated [[Locus (genetics)|bands and sub-bands]]. It shows dark and white regions on [[G banding]]. Each row is vertically aligned at [[centromere]] level. It shows 22 [[Homologous chromosome|homologous]] [[autosomal]] chromosome pairs, both the female (XX) and male (XY) versions of the two [[sex chromosome]]s, as well as the [[human mitochondrial genetics|mitochondrial genome]] (at bottom left). {{further|Karyotype}}]]

Genomics has provided applications in many fields, including [[medicine]], [[biotechnology]], [[anthropology]] and other [[social sciences]].<ref name = "Barnes_2008"/>

=== Genomic medicine ===
Next-generation genomic technologies allow clinicians and biomedical researchers to drastically increase the amount of genomic data collected on large study populations.<ref name = "Feero_2011"/> When combined with new informatics approaches that integrate many kinds of data with genomic data in disease research, this allows researchers to better understand the genetic bases of drug response and disease.<ref name = "Feero_2011a"/><ref name = "Lu_2014"/>

Early efforts to apply the genome to medicine included those by a Stanford team led by [[Euan Ashley]] who developed the first tools for the medical interpretation of a human genome.<ref name="Ashley_2010" /><ref name="Dewey_2011" /><ref name="Dewey_2014" /> The Genomes2People research program at [[Brigham and Women's Hospital]], [[Broad Institute]] and Harvard Medical School was established in 2012 to conduct empirical research in translating genomics into health. Brigham and Women's Hospital opened a Preventive Genomics Clinic in August 2019, with [[Massachusetts General Hospital]] following a month later.<ref name="Robbins_2019" /><ref name="Dark_Daily_2020" /> The ''All of Us'' research program aims to collect genome sequence data from 1 million participants to become a critical component of the precision medicine research platform<ref name="NIH_2018" /> and the ''UK Biobank'' initiative has studied more than 500.000 individuals with deep genomic and phenotypic data.<ref>{{Cite journal |last1=Bycroft |first1=Clare |last2=Freeman |first2=Colin |last3=Petkova |first3=Desislava |last4=Band |first4=Gavin |last5=Elliott |first5=Lloyd T. |last6=Sharp |first6=Kevin |last7=Motyer |first7=Allan |last8=Vukcevic |first8=Damjan |last9=Delaneau |first9=Olivier |last10=O'Connell |first10=Jared |last11=Cortes |first11=Adrian |last12=Welsh |first12=Samantha |last13=Young |first13=Alan |last14=Effingham |first14=Mark |last15=McVean |first15=Gil |date=October 2018 |title=The UK Biobank resource with deep phenotyping and genomic data |journal=Nature |volume=562 |issue=7726 |pages=203–209 |doi=10.1038/s41586-018-0579-z |issn=1476-4687 |pmc=6786975 |pmid=30305743|bibcode=2018Natur.562..203B }}</ref>

=== Synthetic biology and bioengineering ===
The growth of genomic knowledge has enabled increasingly sophisticated applications of [[synthetic biology]].<ref name = "Church_2012"/> In 2010 researchers at the [[J. Craig Venter Institute]] announced the creation of a partially synthetic species of [[bacterium]], ''[[Mycoplasma laboratorium]]'', derived from the [[genome]] of ''[[Mycoplasma genitalium]]''.<ref name = "Baker_2011"/>

=== Population and conservation genomics ===
'''[[Population genomics]]''' has developed as a popular field of research, where genomic sequencing methods are used to conduct large-scale comparisons of DNA sequences among populations - beyond the limits of genetic markers such as short-range [[Polymerase chain reaction|PCR]] products or [[microsatellites]] traditionally used in [[population genetics]]. Population genomics studies [[genome]]-wide effects to improve our understanding of [[microevolution]] so that we may learn the [[phylogenetic]] history and [[demography]] of a population.<ref name = "Luikart_2003" /> Population genomic methods are used for many different fields including [[evolutionary biology]], [[ecology]], [[biogeography]], [[conservation biology]] and [[fisheries management]]. Similarly, '''[[landscape genomics]]''' has developed from [[landscape genetics]] to use genomic methods to identify relationships between patterns of environmental and genetic variation.

Conservationists can use the information gathered by genomic sequencing in order to better evaluate genetic factors key to species conservation, such as the [[genetic diversity]] of a population or whether an individual is heterozygous for a recessive inherited genetic disorder.<ref name = "Frankham_2010" /> By using genomic data to evaluate the effects of [[evolutionary process]]es and to detect patterns in variation throughout a given population, conservationists can formulate plans to aid a given species without as many variables left unknown as those unaddressed by standard [[Conservation genetics|genetic approaches]].<ref name = "Allendorf_2010" />

== See also ==
{{Portal|Biology}}
{{div col|colwidth=20em}}
* [[Hi-C (genomic analysis technique)]]
* [[Cognitive genomics]]
* [[Computational genomics]]
* [[Epigenomics]]
* [[Functional genomics]]
* [[GeneCalling]], an mRNA profiling technology
* [[Genomics of domestication]]
* [[Genetics in fiction]]
* [[Glycomics]]
* [[Immunomics]]
* [[Metagenomics]]
* [[Pathogenomics]]
* [[Personal genomics]]
* [[Proteomics]]
* [[Transcriptomics]]
* [[Venomics]]
* [[Psychogenomics]]
* [[Whole genome sequencing]]
*[[Thomas Roderick]]
<!--alphabetic order-->
{{div col end}}

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{{Reflist | colwidth = 33em | refs =
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}}

== Further reading ==
{{Refbegin|33em}}
* {{cite book | vauthors = Lesk AM | title = Introduction to Genomics | date = 2017 | publisher = Oxford University Press | location = New York | isbn = 978-0-19-107085-3 | page = 544 | edition = 3rd | id =  {{ASIN|0198754833|country=uk}} }}
* {{cite journal | vauthors = Stunnenberg HG, Hubner NC | title = Genomics meets proteomics: identifying the culprits in disease | journal = Human Genetics | volume = 133 | issue = 6 | pages = 689–700 | date = June 2014 | pmid = 24135908 | pmc = 4021166 | doi = 10.1007/s00439-013-1376-2 }}
* {{cite journal | vauthors = Shibata T | title = Cancer genomics and pathology: all together now | journal = Pathology International | volume = 62 | issue = 10 | pages = 647–659 | date = October 2012 | pmid = 23005591 | doi = 10.1111/j.1440-1827.2012.02855.x | s2cid = 27886018 | doi-access = free }}
* {{cite journal | vauthors = Roychowdhury S, Chinnaiyan AM | title = Translating cancer genomes and transcriptomes for precision oncology | journal = CA | volume = 66 | issue = 1 | pages = 75–88 | year = 2016 | pmid = 26528881 | pmc = 4713245 | doi = 10.3322/caac.21329 }}
* {{cite book | vauthors = Gladyshev VN, Zhang Y | veditors = Banci L | series = Metal Ions in Life Sciences | volume = 12 | chapter = Chapter 16 Comparative Genomics Analysis of the Metallomes | title = Metallomics and the Cell |year=2013 | publisher = Springer | isbn = 978-94-007-5560-4 | doi = 10.1007/978-94-007-5561-10_16 | doi-broken-date = 12 July 2025 }} electronic-book {{ISBN|978-94-007-5561-1}} {{issn|1559-0836}} electronic-{{issn|1868-0402}}
{{Refend}}

== External links ==
{{div col|colwidth=33em}}
* [http://arjournals.annualreviews.org/loi/genom/ Annual Review of Genomics and Human Genetics] {{Webarchive|url=https://web.archive.org/web/20090118194411/http://arjournals.annualreviews.org/loi/genom |date=2009-01-18 }}
* [http://www.biomedcentral.com/bmcgenomics/ BMC Genomics]: A BMC journal on Genomics
* [http://www.elsevier.com/wps/find/journaldescription.cws_home/622838/description#description Genomics journal]
* [http://genomics.org Genomics.org]: An openfree genomics portal.
* [http://www.genome.gov/ NHGRI]: US government's genome institute
* [http://arquivo.pt/wayback/20160516145036/http://cmr.jcvi.org/ JCVI Comprehensive Microbial Resource]
* [https://web.archive.org/web/20201127192012/http://www.koreagenome.org/ KoreaGenome.org]: The first Korean Genome published and the sequence is available freely.
* [https://web.archive.org/web/20171228195616/http://www.genomicsnetwork.ac.uk/ GenomicsNetwork]: Looks at the development and use of the science and technologies of genomics.
* [https://web.archive.org/web/20091115214635/http://www.igs.umaryland.edu/research_topics.php Institute for Genome Sciences]: Genomics research.
* [http://ocw.mit.edu/courses/health-sciences-and-technology/hst-512-genomic-medicine-spring-2004/ MIT OpenCourseWare HST.512 Genomic Medicine] A free, self-study course in genomic medicine. Resources include audio lectures and selected lecture notes.
* [http://www.nature.com/encode/#/threads/machine-learning-approaches-to-genomics ENCODE threads explorer]  Machine learning approaches to genomics. [[Nature (journal)]]
* [https://web.archive.org/web/20131005093407/https://mapsengine.google.com/map/viewer?mid=zeHBUH4JmjxQ.kB0PwL4lW7VM Global map of genomics laboratories]
* [http://www.nature.com/scitable/ebooks/genomics-4 Genomics: Scitable by nature education]
{{div col end}}
* [http://www.thegeneboxacademy.com/ Learn All About Genetics Online]

{{Genomics}}
{{Genetics}}
{{Branches of biology}}
{{Genealogical DNA test}}
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[[Category:Genomics| ]]