Domanda del libro di testo
Explain the features of the Initiator (Inr) elements, BREs, DPEs, and MTEs of focused promoters.
869
views
Ch. 16 - Regulation of Gene Expression in Eukaryotes
Klug10th EditionEssentials of GeneticsISBN: 9780135588789
Non è quello che usi tu?Cambia libro di testoScegli un libro di testo diverso
TOC.tableOfContents
- Ch. 1 - Introduction to Genetics16
- Ch. 2 - Mitosis and Meiosis28
- Ch. 3 - Mendelian Genetics37
- Ch. 4 - Modification of Mendelian Ratios53
- Ch. 5 - Sex Determination and Sex Chromosomes32
- Ch. 6 - Chromosome Mutations: Variation in Number and Arrangement37
- Ch. 7 - Linkage and Chromosome Mapping in Eukaryotes36
- Ch. 8 - Genetic Analysis and Mapping in Bacteria and Bacteriophages24
- Ch. 9 - DNA Structure and Analysis38
- Ch. 10 - DNA Replication29
- Ch. 11 - Chromosome Structure and DNA Sequence Organization22
- Ch. 12 - The Genetic Code and Transcription36
- Ch. 13 - Translation and Proteins27
- Ch. 14 - Gene Mutation, DNA Repair, and Transposition34
- Ch. 15 - Regulation of Gene Expression in Bacteria22
- Ch. 16 - Regulation of Gene Expression in Eukaryotes37
- Ch. 17 - Recombinant DNA Technology27
- Ch. 18 - Genomics, Bioinformatics, and Proteomics30
- Ch. 19 - The Genetics of Cancer21
- Ch. 20 - Quantitative Genetics and Multifactorial Traits37
- Ch. 21 - Population and Evolutionary Genetics45
Klug10th EditionEssentials of GeneticsISBN: 9780135588789Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testo
Klug 10th EditionCh. 16 - Regulation of Gene Expression in EukaryotesProblema 8
Klug 10th EditionCh. 16 - Regulation of Gene Expression in EukaryotesProblema 8Capitolo 16, Problema 8
Describe the manner in which activators and repressors influence the rate of transcription initiation. How might chromatin structure be involved in such regulation?
Guida verificata passo dopo passo1
Begin by defining activators and repressors as types of transcription factors that influence gene expression by binding to specific DNA sequences near the promoter region of a gene.
Explain that activators increase the rate of transcription initiation by facilitating the recruitment or stabilization of RNA polymerase and the general transcription machinery at the promoter, often by interacting with the mediator complex or other coactivators.
Describe that repressors decrease transcription initiation by blocking the binding of activators or RNA polymerase, recruiting corepressors, or modifying chromatin to a less accessible state, thereby preventing transcription machinery assembly.
Introduce the concept of chromatin structure, emphasizing that DNA is wrapped around histone proteins forming nucleosomes, which can be tightly packed (heterochromatin) or loosely packed (euchromatin), affecting accessibility of DNA to transcription factors.
Explain how activators can promote chromatin remodeling to open chromatin structure (e.g., by recruiting histone acetyltransferases), making DNA more accessible, while repressors can recruit histone deacetylases or other chromatin-modifying enzymes to condense chromatin and reduce transcription.
Risposta video verificata per un problema simile:
Questa soluzione video è stata consigliata dai nostri tutor come utile per risolvere questo problema.
Durata del video:
1mConcetti chiave
Ecco i concetti essenziali che devi comprendere per rispondere correttamente alla domanda.
Role of Activators and Repressors in Transcription
Activators are proteins that increase transcription by binding to specific DNA sequences and facilitating the recruitment of RNA polymerase and transcription machinery. Repressors, conversely, bind to DNA to block or hinder the assembly of these components, reducing transcription initiation. Their interaction with promoter or enhancer regions directly influences gene expression levels.
Video consigliato:
Percorso guidato
09:16
Eukaryotic Transcription
Transcription Initiation Mechanism
Transcription initiation involves the assembly of RNA polymerase and general transcription factors at the promoter region of a gene. This process is tightly regulated by various proteins, including activators and repressors, which modulate the accessibility and efficiency of the transcriptional machinery to start RNA synthesis.
Video consigliato:
Percorso guidato
09:16Eukaryotic Transcription
Chromatin Structure and Gene Regulation
Chromatin structure affects gene expression by controlling DNA accessibility. Tightly packed chromatin (heterochromatin) restricts access to transcription factors, repressing transcription, while loosely packed chromatin (euchromatin) allows activators and RNA polymerase to bind DNA more easily. Modifications like histone acetylation can alter chromatin to regulate transcription.
Video consigliato:
Percorso guidato
04:35Chromatin
Pratica correlata
Domanda del libro di testo
Distinguish between the cis-acting regulatory elements referred to as promoters and enhancers.
652
views
Domanda del libro di testo
Research indicates that promoters may fall into one of two classes: focused or dispersed. How do these classes differ, and which genes tend to be associated with each?
526
views
Domanda del libro di testo
Many promoter regions contain CAAT boxes containing consensus sequences CAAT or CCAAT approximately 70 to 80 bases upstream from the transcription start site. How might one determine the influence of CAAT boxes on the transcription rate of a given gene?
891
views
Domanda del libro di testo
Provide a brief description of two different types of histone modification and how they impact transcription.
709
views