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Genomics02:02

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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...
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The genome of most prokaryotic organisms consists of double-stranded DNA organized into one circular chromosome in a region of cytoplasm called the nucleoid. The chromosome is tightly wound, or supercoiled, for efficient storage. Prokaryotes also contain other circular pieces of DNA called plasmids. These plasmids are smaller than the chromosome and often carry genes that confer adaptive functions, such as antibiotic resistance.
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Within the human body, a complex and detailed system of trillions of cells works in unison to sustain life. Each cell houses a nucleus, which contains 46 chromosomes divided into 23 pairs. Chromosomes are highly coiled structures made of the genetic material DNA. These chromosomes are essential carriers of genetic information, with half inherited from the mother through her egg and the other half from the father's sperm, combining to create the unique genetic makeup of an individual.
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Prokaryotic genomes exhibit a streamlined organization of coding and non-coding regions essential for gene expression and protein synthesis. While coding regions contain the genetic instructions for proteins or functional RNAs, non-coding regions regulate the precise transcription and translation of these genes.Coding Regions: Proteins and RNAsThe primary coding regions, known as structural genes, include sequences transcribed into messenger RNA (mRNA) and ultimately translated into...
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Two structural features of the DNA molecule provide a basis for the mechanisms of heredity: the four nucleotide bases and its double-stranded nature. The Watson-Crick model of double-helical DNA structure, proposed in 1952, drew heavily upon the X-ray crystallography work of researchers Rosalind Franklin and Maurice Wilkins. Watson, Crick, and Wilkins jointly received the Nobel Prize in Physiology or Medicine for their work in 1962. Franklin was, controversially, excluded from the prize for...
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3D Multicolor DNA FISH Tool to Study Nuclear Architecture in Human Primary Cells
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The Biological Function of Genome Organization.

Xin Yang1, Hongni Zhu1, Yajie Liu1

  • 1Institute of Biomedical and Health Engineering, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China.

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The genome

Keywords:
chromatin loopcompartmentgenome architecturegenome organizationtopologically associating domain

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Area of Science:

  • Genomics
  • Molecular Biology
  • Cell Biology

Background:

  • The mammalian genome is organized hierarchically into functional units like chromatin loops and topologically associating domains.
  • This genome architecture is crucial for essential nuclear functions, cellular identity, and organismal development.

Purpose of the Study:

  • To synthesize current understanding of the relationship between genome architecture and its biological roles.
  • To discuss the mechanisms of genome structure establishment and maintenance.
  • To examine the functional consequences and dynamics of 3D genome organization.

Main Methods:

  • This is a review article, synthesizing existing research.
  • It discusses mechanisms involving architectural proteins, transcription factors, epigenetic regulators, and non-coding RNAs.
  • It examines dynamics during differentiation, development, and disease.

Main Results:

  • Hierarchical genome structures are dynamically established and maintained by various molecular factors.
  • 3D genome organization modulates transcription, gene co-expression, epigenetic modification, DNA replication, and repair.
  • Disruptions in genome structure are linked to human diseases.

Conclusions:

  • Understanding 3D genome organization is vital for deciphering nuclear processes.
  • It holds promise for elucidating disease mechanisms and developing therapeutics.