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What are the roles of the Polycomb and Trithorax complexes in eukaryotic gene regulation?
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Ch. 13 - Regulation of Gene Expression in Eukaryotes
Sanders3rd EditionGenetic Analysis: An Integrated ApproachISBN: 9780135564172
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TOC.tableOfContents
- Ch. 1 - The Molecular Basis of Heredity, Variation, and Evolution64
- Ch. 2 - Transmission Genetics144
- Ch. 3 - Cell Division and Chromosome Heredity81
- Ch. 4 - Gene Interaction87
- Ch. 5 - Genetic Linkage and Mapping in Eukaryotes103
- Ch. 6 - Genetic Analysis and Mapping in Bacteria and Bacteriophages73
- Ch. 7 - DNA Structure and Replication71
- Ch. 8 - Molecular Biology of Transcription and RNA Processing79
- Ch. 9 - The Molecular Biology of Translation110
- Ch. 10 - Eukaryotic Chromosome Abnormalities and Molecular Organization100
- Ch. 11 - Gene Mutation, DNA Repair, and Homologous Recombination86
- Ch. 12 - Regulation of Gene Expression in Bacteria and Bacteriophage90
- Ch. 13 - Regulation of Gene Expression in Eukaryotes38
- Ch. 14 - Analysis of Gene Function via Forward Genetics and Reverse Genetics72
- Ch. 15 - Recombinant DNA Technology and Its Applications69
- Ch. 16 - Genomics: Genetics from a Whole-Genome Perspective49
- Ch. 17 - Organelle Inheritance and the Evolution of Organelle Genomes27
- Ch. 18 - Developmental Genetics43
- Ch. 19 - Genetic Analysis of Quantitative Traits66
- Ch. 20 - Population Genetics and Evolution at the Population, Species, and Molecular Levels105
Sanders3rd EditionGenetic Analysis: An Integrated ApproachISBN: 9780135564172Non è quello che usi tu?Cambia libro di testo
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Sanders 3rd EditionCh. 13 - Regulation of Gene Expression in EukaryotesProblema 6
Sanders 3rd EditionCh. 13 - Regulation of Gene Expression in EukaryotesProblema 6Capitolo 13, Problema 6
Outline the roles of RNA in eukaryotic gene regulation.
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Understand that RNA plays a central role in eukaryotic gene regulation by influencing transcription, RNA processing, and translation. Begin by identifying the types of RNA involved: mRNA, tRNA, rRNA, and regulatory RNAs such as miRNA, siRNA, and lncRNA.
Explore the role of microRNAs (miRNAs) and small interfering RNAs (siRNAs) in post-transcriptional regulation. These small RNAs bind to complementary sequences on target mRNAs, leading to mRNA degradation or inhibition of translation.
Examine the role of long non-coding RNAs (lncRNAs) in gene regulation. lncRNAs can act as scaffolds, decoys, or guides to recruit chromatin-modifying complexes, thereby influencing transcriptional activity.
Discuss the role of RNA in alternative splicing. Pre-mRNA undergoes splicing to remove introns, and the inclusion or exclusion of specific exons can generate multiple protein isoforms from a single gene, regulated by splicing factors and RNA-binding proteins.
Highlight the role of RNA in epigenetic regulation. For example, certain RNAs can recruit chromatin-modifying enzymes to specific genomic loci, leading to changes in histone modifications or DNA methylation, which affect gene expression.
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Types of RNA
In eukaryotic cells, several types of RNA play crucial roles in gene regulation. Messenger RNA (mRNA) carries genetic information from DNA to ribosomes for protein synthesis. Ribosomal RNA (rRNA) forms the core of ribosome structure and function, while transfer RNA (tRNA) helps in translating mRNA into proteins. Additionally, non-coding RNAs, such as microRNAs (miRNAs) and long non-coding RNAs (lncRNAs), are involved in regulating gene expression at various levels.
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Transcriptional Regulation
Transcriptional regulation is the process by which the synthesis of mRNA is controlled, influencing gene expression. This involves transcription factors that bind to specific DNA sequences near genes, either promoting or inhibiting transcription. RNA polymerase, the enzyme responsible for synthesizing RNA, is recruited or blocked by these factors, determining whether a gene is expressed. This regulation is essential for cellular differentiation and response to environmental signals.
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Eukaryotic Transcription
Post-Transcriptional Modifications
After transcription, RNA undergoes several modifications that affect its stability and translation efficiency. These include 5' capping, polyadenylation, and splicing, which remove introns and join exons. These modifications not only protect mRNA from degradation but also facilitate its export from the nucleus and enhance translation. Additionally, regulatory RNAs like miRNAs can bind to mRNA, leading to its degradation or inhibition of translation, further fine-tuning gene expression.
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04:30Post Translational Modifications
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