Domanda del libro di testo
The regulation of mRNA decay relies heavily upon deadenylases and decapping enzymes. Explain how these classes of enzymes are critical to initiating mRNA decay.
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Ch. 18 - Post-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. 18 - Post-transcriptional Regulation in EukaryotesProblema 5
Klug 12th EditionCh. 18 - Post-transcriptional Regulation in EukaryotesProblema 5Capitolo 18, Problema 5
Explain how the use of alternative promoters and alternative polyadenylation signals produces mRNAs with different 5' and 3' ends.
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Understand that a gene can have multiple promoters, which are DNA sequences where RNA polymerase binds to initiate transcription. Alternative promoters allow transcription to start at different sites, producing mRNAs with different 5' ends.
Recognize that the 5' end of an mRNA corresponds to the transcription start site determined by the promoter used. When alternative promoters are used, the resulting mRNAs have distinct 5' untranslated regions (5' UTRs) or even different initial exons.
Know that polyadenylation signals are sequences in the pre-mRNA that signal where cleavage and addition of the poly(A) tail occur, defining the 3' end of the mature mRNA.
Alternative polyadenylation involves the use of different polyadenylation signals within the same gene, leading to mRNAs with variable 3' untranslated regions (3' UTRs) or different coding sequences if polyadenylation occurs within an exon.
Combine these concepts to see that the use of alternative promoters changes the 5' end of the mRNA, while alternative polyadenylation signals change the 3' end, resulting in mRNA isoforms with different regulatory elements and potentially different stability, localization, or translation efficiency.
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Alternative Promoters
Alternative promoters are different DNA sequences upstream of a gene that can initiate transcription at distinct start sites. Using alternative promoters results in mRNAs with varied 5' untranslated regions (UTRs) or even different coding sequences, affecting gene regulation and protein diversity.
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01:57
Alternative DNA Forms
Alternative Polyadenylation
Alternative polyadenylation involves the use of different polyadenylation signals within the same gene, leading to mRNAs with variable 3' untranslated regions (UTRs). This process influences mRNA stability, localization, and translation efficiency by altering the length and sequence of the 3' end.
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01:57Alternative DNA Forms
mRNA Processing and Transcript Diversity
mRNA processing includes transcription initiation and termination events that define transcript boundaries. The combination of alternative promoters and polyadenylation sites generates multiple mRNA isoforms from a single gene, increasing transcriptome complexity and enabling fine-tuned gene expression.
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08:39mRNA Processing
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