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Describe the manner in which activators and repressors influence the rate of transcription initiation. How might chromatin structure be involved in such regulation?
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Ch. 16 - Regulation of Gene Expression in Eukaryotes
Klug10th EditionEssentials of GeneticsISBN: 9780135588789
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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
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Klug 10th EditionCh. 16 - Regulation of Gene Expression in EukaryotesProblema 11
Klug 10th EditionCh. 16 - Regulation of Gene Expression in EukaryotesProblema 11Capitolo 16, Problema 11
Explain the features of the Initiator (Inr) elements, BREs, DPEs, and MTEs of focused promoters.
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Start by defining what a focused promoter is: a promoter type where transcription initiates at a single or a few closely spaced start sites, often found in genes with regulated expression.
Explain the Initiator (Inr) element: it is a core promoter sequence that overlaps the transcription start site (TSS) and helps direct the accurate initiation of transcription by RNA polymerase II. Typically, it has a consensus sequence around the +1 position.
Describe the BRE (TFIIB Recognition Element): this element is located immediately upstream or downstream of the TATA box and serves as a binding site for the transcription factor TFIIB, which helps recruit RNA polymerase II to the promoter.
Discuss the DPE (Downstream Promoter Element): found downstream of the TSS (around +28 to +32), the DPE works together with the Inr to facilitate transcription initiation, especially in promoters lacking a TATA box.
Explain the MTE (Motif Ten Element): located downstream of the TSS (around +18 to +27), the MTE cooperates with the Inr and DPE to enhance transcription efficiency by providing additional binding sites for transcription factors.
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Initiator (Inr) Element
The Initiator (Inr) is a core promoter element located around the transcription start site (TSS). It helps direct RNA polymerase II to the correct initiation point, often compensating for the absence of a TATA box. The Inr sequence is typically rich in pyrimidines and purines, facilitating precise transcription initiation.
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03:08
Drosophila P Element
TFIIB Recognition Elements (BREs)
BREs are short DNA sequences found immediately upstream (BREu) or downstream (BREd) of the TATA box in focused promoters. They serve as binding sites for the general transcription factor TFIIB, enhancing the stability and specificity of the pre-initiation complex formation, thus influencing transcription efficiency.
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Percorso guidato
03:08Drosophila P Element
Downstream Promoter Elements (DPEs) and Motif Ten Elements (MTEs)
DPEs and MTEs are core promoter elements located downstream of the TSS, typically between +28 to +32 for DPE and +18 to +27 for MTE. They function in promoters lacking a TATA box by interacting with transcription factors like TFIID, aiding in the recruitment of RNA polymerase II and promoting accurate transcription initiation.
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05:30Human Transposable Elements
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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?
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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?
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