Domanda del libro di testo
Explain how the following mutations would affect transcription of the yeast GAL1 gene in the presence of galactose.
A deletion within the GAL4 gene that removes the region encoding amino acids 1 to 100.
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Ch. 17 - Transcriptional Regulation in Eukaryotes
Klug12th EditionConcepts of GeneticsISBN: 9780135564776
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TOC.tableOfContents
- 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
Klug12th EditionConcepts of GeneticsISBN: 9780135564776Non è quello che usi tu?Cambia libro di testo
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Klug 12th EditionCh. 17 - Transcriptional Regulation in EukaryotesProblema 22d
Klug 12th EditionCh. 17 - Transcriptional Regulation in EukaryotesProblema 22dCapitolo 17, Problema 22d
Explain how the following mutations would affect transcription of the yeast GAL1 gene in the presence of galactose.
A deletion of one of the four UASG elements upstream from the GAL1 gene.
Guida verificata passo dopo passo1
Understand that the GAL1 gene in yeast is regulated by upstream activating sequences (UASG), which are binding sites for transcriptional activators that enhance transcription in the presence of galactose.
Recognize that the presence of multiple UASG elements (four in this case) allows for a stronger or more robust transcriptional activation due to cooperative binding of activators.
Consider that a deletion of one UASG element reduces the number of binding sites available for activators, potentially decreasing the overall transcriptional activation of the GAL1 gene.
Analyze how this reduction might affect the transcription rate: fewer activator binding sites can lead to lower recruitment of the transcriptional machinery, thus reducing mRNA synthesis from the GAL1 gene when galactose is present.
Conclude that while transcription will still occur in the presence of galactose (since other UASG elements remain), the efficiency or level of transcription is expected to be diminished compared to the wild-type gene with all four UASG elements intact.
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Upstream Activating Sequences (UAS)
UAS elements are specific DNA sequences located upstream of a gene that serve as binding sites for transcriptional activators. In yeast, UASG elements enhance transcription of the GAL1 gene by recruiting activator proteins in response to galactose, increasing RNA polymerase II recruitment and gene expression.
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Percorso guidato
08:41
Sequencing Difficulties
Transcriptional Regulation of the GAL1 Gene
The GAL1 gene is regulated by the presence of galactose, which activates transcription through binding of regulatory proteins to UASG sites. This regulation ensures GAL1 is expressed only when galactose is available, enabling yeast to metabolize this sugar efficiently.
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09:22Review of Regulation
Effects of Deletions in Regulatory DNA Elements
Deleting one of the UASG elements reduces the number of activator binding sites, potentially decreasing transcriptional activation. This can lead to lower GAL1 expression levels in the presence of galactose, as fewer activators can bind and stimulate transcription.
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03:38Maternal Effect
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Explain how the following mutations would affect transcription of the yeast GAL1 gene in the presence of galactose.
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