DNA Structure and Nuclear Organization
The physical substrate on which epigenetic control acts
Core question: Epigenetic regulation requires a physical genome. This chapter follows DNA from its chemical building blocks to the , s, domains, and the accessible or inaccessible states that influence whether al machinery can reach a gene.
Learning Objectives
Identify major structures of the .
Relate nucleotide chemistry and strand organization to DNA function.
Explain formation and packaging.
Compare and .
Connect nuclear organization with gene accessibility.
Nuclear and DNA architecture
To understand DNA, you must first understand its environment, the . DNA is not simply a linear sequence of nucleotides floating freely in a cell; it is carefully packaged, protected, and dynamically regulated within the confines of the . This chapter will explore the intricate architecture of the and how it orchestrates the structure, organization, and function of DNA. We will also investigate the molecular mechanics of , the chemical properties of nucleotides, the dynamic regulation of gene accessibility, and how alterations in these processes can lead to human disease.