Textbook Question
Describe the organization of the interphase nucleus. Include in your presentation a description of chromosome territories, interchromatin compartments, and transcription factories.
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Ch. 17 - Transcriptional Regulation in Eukaryotes
Klug12th EditionConcepts of Genetics ISBN: 9780135564776
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Table of contents
- Ch. 1 - Introduction to Genetics17
- Ch. 2 - Mitosis and Meiosis36
- Ch. 3 - Mendelian Genetics51
- Ch. 4 - Extensions of Mendelian Genetics74
- Ch. 5 - Chromosome Mapping in Eukaryotes51
- Ch. 6 - Genetic Analysis and Mapping in Bacteria and Bacteriophages46
- Ch. 7 - Sex Determination and Sex Chromosomes33
- Ch. 8 - Chromosome Mutations: Variation in Number and Arrangement40
- Ch. 9 - Extranuclear Inheritance31
- Ch. 10 - DNA Structure and Analysis43
- Ch. 11 - DNA Replication and Recombination44
- Ch. 12 - DNA Organization in Chromosomes30
- Ch. 13 - The Genetic Code and Transcription54
- Ch. 14 - Translation and Proteins47
- Ch. 15 - Gene Mutation, DNA Repair, and Transposition41
- Ch. 16 - Regulation of Gene Expression in Bacteria29
- Ch. 17 - Transcriptional Regulation in Eukaryotes41
- Ch. 18 - Post-transcriptional Regulation in Eukaryotes33
- Ch. 19 - Epigenetics33
- Ch. 20 - Recombinant DNA Technology44
- Ch. 21 - Genomic Analysis36
- Ch. 22 - Applications of Genetic Engineering and Biotechnology36
- Ch. 23 - Developmental Genetics37
- Ch. 24 - Cancer Genetics34
- Ch. 25 - Quantitative Genetics and Multifactorial Traits54
- Ch. 26 - Population and Evolutionary Genetics45
Chapter 17, Problem 4
Provide a definition of chromatin remodeling, and give two examples of this phenomenon.
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Define chromatin remodeling as the dynamic modification of chromatin architecture to allow access of condensed genomic DNA to the regulatory transcription machinery proteins, thereby controlling gene expression.
Explain that chromatin remodeling involves changes such as repositioning, ejecting, or restructuring nucleosomes, which are the basic units of chromatin composed of DNA wrapped around histone proteins.
Describe the two main types of chromatin remodeling mechanisms: ATP-dependent chromatin remodeling complexes and covalent histone modifications.
Provide the first example: the SWI/SNF complex, an ATP-dependent chromatin remodeler that uses energy from ATP hydrolysis to slide or eject nucleosomes, facilitating transcription factor access to DNA.
Provide the second example: histone acetylation by histone acetyltransferases (HATs), which adds acetyl groups to histone tails, reducing their positive charge and loosening DNA-histone interactions to promote gene expression.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Chromatin Structure
Chromatin is the complex of DNA and proteins, mainly histones, that package DNA into a compact, organized form within the nucleus. Its structure regulates gene accessibility, influencing gene expression by controlling how tightly or loosely DNA is wound around histones.
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Chromatin
Chromatin Remodeling
Chromatin remodeling refers to dynamic modifications of chromatin architecture that alter DNA accessibility without changing the DNA sequence. This process enables or restricts the binding of transcription factors and other proteins, thereby regulating gene expression.
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Examples of Chromatin Remodeling
Two common examples of chromatin remodeling include histone modification (such as acetylation or methylation) and ATP-dependent chromatin remodeling complexes that reposition nucleosomes. These changes can activate or repress gene transcription by altering chromatin accessibility.
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Related Practice
Textbook Question
Write a short essay describing how cis-acting regulatory elements, activators, and chromatin modifiers are all coordinately involved in regulating transcription initiation.
Textbook Question
How do we know that there is an association between disease susceptibility in humans and regulatory DNA sequences?
Textbook Question
Provide a brief description of two different types of histone modification and how they impact transcription.
Textbook Question
What features of eukaryotes provide additional opportunities for the regulation of gene expression compared to bacteria?
Textbook Question
A number of experiments have demonstrated that areas of the genome that are transcriptionally inactive are also resistant to DNase I digestion. However, transcriptionally active areas are DNase I sensitive. Describe how DNase I resistance or sensitivity might indicate transcriptional activity.