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Nuclear organization
Nuclear organization refers to the spatial organization and dynamics of chromatin within a cell nucleus during interphase. There are many different levels and scales of nuclear organization.
At the smallest scale, DNA is packaged into units called nucleosomes, which compacts DNA about 7-fold. In addition, nucleosomes protect DNA from damage and carry epigenetic information. Positions of nucleosomes determine accessibility of DNA to transcription factors.
At the intermediate scale, DNA looping can physically bring together DNA elements that would otherwise be separated by large distances. These interactions allow regulatory signals to cross over large genomic distances—for example, from enhancers to promoters.
At a larger scale, chromosomes are organized into two compartments labelled A ("active") and B ("inactive"), which are further subdivided into sub-compartments. At the largest scale, entire chromosomes segregate into distinct regions called chromosome territories.
Chromosome organization is dynamic at all scales. Individual nucleosomes undergo constant thermal motion and nucleosome breathing. At intermediate scales, an active process of loop extrusion creates dynamic loops and Topologically Associating Domains (TADs).
Each human cell contains around two metres of DNA, which must be tightly folded to fit inside the cell nucleus. However, in order for the cell to function, proteins must be able to access the sequence information contained within the DNA, in spite of its tightly-packed nature. Hence, the cell has a number of mechanisms in place to control how DNA is organized.
Moreover, nuclear organization can play a role in establishing cell identity. Cells within an organism have near identical nucleic acid sequences, but often exhibit different phenotypes. One way in which this individuality occurs is through changes in genome architecture, which can alter the expression of different sets of genes. These alterations can have a downstream effect on cellular functions such as cell cycle facilitation, DNA replication, nuclear transport, and alteration of nuclear structure. Controlled changes in nuclear organization are essential for proper cellular function.
The organization of chromosomes into distinct regions within the nucleus was first proposed in 1885 by Carl Rabl. Later in 1909, with the help of the microscopy technology at the time, Theodor Boveri coined the termed chromosome territories after observing that chromosomes occupy individually distinct nuclear regions. Since then, mapping genome architecture has become a major topic of interest.
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Nuclear organization
Nuclear organization refers to the spatial organization and dynamics of chromatin within a cell nucleus during interphase. There are many different levels and scales of nuclear organization.
At the smallest scale, DNA is packaged into units called nucleosomes, which compacts DNA about 7-fold. In addition, nucleosomes protect DNA from damage and carry epigenetic information. Positions of nucleosomes determine accessibility of DNA to transcription factors.
At the intermediate scale, DNA looping can physically bring together DNA elements that would otherwise be separated by large distances. These interactions allow regulatory signals to cross over large genomic distances—for example, from enhancers to promoters.
At a larger scale, chromosomes are organized into two compartments labelled A ("active") and B ("inactive"), which are further subdivided into sub-compartments. At the largest scale, entire chromosomes segregate into distinct regions called chromosome territories.
Chromosome organization is dynamic at all scales. Individual nucleosomes undergo constant thermal motion and nucleosome breathing. At intermediate scales, an active process of loop extrusion creates dynamic loops and Topologically Associating Domains (TADs).
Each human cell contains around two metres of DNA, which must be tightly folded to fit inside the cell nucleus. However, in order for the cell to function, proteins must be able to access the sequence information contained within the DNA, in spite of its tightly-packed nature. Hence, the cell has a number of mechanisms in place to control how DNA is organized.
Moreover, nuclear organization can play a role in establishing cell identity. Cells within an organism have near identical nucleic acid sequences, but often exhibit different phenotypes. One way in which this individuality occurs is through changes in genome architecture, which can alter the expression of different sets of genes. These alterations can have a downstream effect on cellular functions such as cell cycle facilitation, DNA replication, nuclear transport, and alteration of nuclear structure. Controlled changes in nuclear organization are essential for proper cellular function.
The organization of chromosomes into distinct regions within the nucleus was first proposed in 1885 by Carl Rabl. Later in 1909, with the help of the microscopy technology at the time, Theodor Boveri coined the termed chromosome territories after observing that chromosomes occupy individually distinct nuclear regions. Since then, mapping genome architecture has become a major topic of interest.