Textbook Question
Write a short essay describing how an mRNA may be regulated in three different ways by specific cis-elements and RBPs.
Ch. 18 - Post-transcriptional Regulation in Eukaryotes
Klug12th EditionConcepts of Genetics ISBN: 9780135564776
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Table of contents
- 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
Chapter 18, Problem 3
List three types of alternative splicing patterns and how they lead to the production of different protein isoforms.
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Understand that alternative splicing is a process during gene expression that allows a single gene to produce multiple protein isoforms by including or excluding certain exons in the final mRNA.
Identify the first type: Exon skipping (or cassette exon), where an exon may be included or skipped, leading to proteins with or without that specific segment.
Identify the second type: Mutually exclusive exons, where only one of two exons is included in the mRNA, resulting in different protein variants depending on which exon is present.
Identify the third type: Alternative 5' or 3' splice sites, where the spliceosome uses different splice sites at the ends of an exon, changing the length of the exon and thus altering the protein sequence.
Explain how each of these splicing patterns changes the mRNA sequence and consequently the amino acid sequence of the protein, producing distinct isoforms with potentially different functions.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Alternative Splicing
Alternative splicing is a process during gene expression where different combinations of exons are joined or skipped in the pre-mRNA, resulting in multiple mRNA variants from a single gene. This mechanism increases protein diversity by producing different protein isoforms with varied functions.
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01:57
Alternative DNA Forms
Types of Alternative Splicing Patterns
Common alternative splicing patterns include exon skipping (an exon is excluded), mutually exclusive exons (only one of two exons is included), and intron retention (an intron is retained in the mature mRNA). Each pattern alters the mRNA sequence, affecting the resulting protein structure.
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01:57Alternative DNA Forms
Protein Isoforms and Functional Diversity
Different splicing patterns produce protein isoforms that may vary in domains, localization, or activity. These isoforms can have distinct biological roles, enabling a single gene to contribute to multiple cellular functions and increasing the complexity of gene regulation.
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05:05Proteins
Related Practice
Textbook Question
Explain how a tissue-specific RNA-binding protein can lead to tissue-specific alternative splicing via splicing enhancers or splicing silencers.
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Textbook Question
How do we know that microRNAs negatively regulate target mRNAs?
Textbook Question
How do we know that double-stranded RNA molecules can control gene expression?
Textbook Question
Explain how the use of alternative promoters and alternative polyadenylation signals produces mRNAs with different 5' and 3' ends.
Textbook Question
Consider the CT/CGRP example of alternative splicing show. Which different types of alternative splicing patterns are represented?
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