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Genomics

Genomics

Genomics is the science of genomes: it is the study of all the genetic material of an organism. In humans, the genome consists of information carried in 23 pairs of chromosomes in the nucleus, as well as mitochondrial DNA. In genomics, both coding and non-coding DNA is sequenced and analyzed. Genomics allows a better understanding of all living things, their evolution, and their diversity. It has a myriad of uses: for example, to build phylogenetic trees, to improve productivity and...

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 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.

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.

Genomic DNA in Eukaryotes

Genomic DNA in Eukaryotes

Eukaryotes have large genomes compared to prokaryotes. To fit their genomes into a cell, eukaryotic DNA is packaged extraordinarily tightly inside the nucleus. To achieve this, DNA is tightly wound around proteins called histones, which are packaged into nucleosomes that are joined by linker DNA and coil into chromatin fibers. Additional fibrous proteins further compact the chromatin, which is recognizable as chromosomes during certain phases of cell division.

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Related Experiment Video

Updated: Jul 2, 2026

Microbial Communities in Nature and Laboratory - Interview

Microbial Communities in Nature and Laboratory - Interview

Published on: May 28, 2007

The human genome and its upcoming dynamics.

¹Genome Analysis, Leibniz Institute for Age Research - Fritz Lipmann Institute, Jena, Germany.

Genome Dynamics

|August 30, 2008

Summary

The human genome sequence provides a near-complete reference for biomedical research. This near-complete human genome reveals extensive structural variations, challenging previous notions of genetic individuality.

Area of Science:

Genomics
Human Genetics
Biomedical Research

Background:

The human genome project aimed to create a universal, accurate, and complete DNA sequence.
Previous understanding focused on small variations as the basis for human traits.

Purpose of the Study:

To present the near-complete assembly of the human genome.
To re-evaluate the concept of genome plasticity and human genetic variation.

Main Methods:

International collaborative efforts in genome mapping and sequencing.
Analysis of the euchromatic portion and overall genome size.
Identification and characterization of repetitive sequences and segmental duplications.

Main Results:

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The current assembly covers approximately 99% of the euchromatic human genome (2.88 Gb).

The total human genome size is approximately 3.08 Gb, with over half composed of repetitive sequences.

A high proportion of segmental duplications and large-scale structural polymorphisms were identified.

Conclusions:

The near-complete human genome reference challenges the concept of a fixed reference sequence.
Genome plasticity extends beyond small variations to include large-scale structural differences between individuals.