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Compare DNA transposons and retrotransposons. What properties do they share?
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Ch. 14 - Gene Mutation, DNA Repair, and Transposition
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. 14 - Gene Mutation, DNA Repair, and TranspositionProblema 19
Klug 10th EditionCh. 14 - Gene Mutation, DNA Repair, and TranspositionProblema 19Capitolo 14, Problema 19
In maize, a Ds or Ac transposon can alter the function of genes at or near the site of transposon insertion. It is possible for these elements to transpose away from their original insertion site, causing a reversion of the mutant phenotype. In some cases, however, even more severe phenotypes appear, due to events at or near the mutant allele. What might be happening to the transposon or the nearby gene to create more severe mutations?
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Understand that transposons like Ds (Dissociation) and Ac (Activator) can move within the genome, which can disrupt gene function when they insert into or near genes.
Recognize that when a transposon excises (moves out) from its original site, it can sometimes restore the gene's function, leading to a reversion of the mutant phenotype.
Consider that during the excision process, the transposon may not leave the DNA cleanly; it can cause small insertions or deletions (indels) at the excision site, which can further disrupt the gene.
Realize that these imprecise excision events can create more severe mutations if they alter the coding sequence or regulatory regions of the gene, potentially causing frameshifts or loss of important gene elements.
Also, transposon movement can cause chromosomal rearrangements or affect nearby genes, which might contribute to the appearance of more severe phenotypes.
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Transposons and Their Mechanism of Transposition
Transposons, such as Ds and Ac elements in maize, are DNA sequences that can move within the genome. They insert into genes or regulatory regions, disrupting normal gene function. Their movement can be cut-and-paste or replicative, causing mutations or reversions depending on insertion or excision events.
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06:10
Prokaryotic Transposable Elements
Effects of Transposon Excision and Footprint Mutations
When a transposon excises from a gene, it may leave behind small insertions or deletions called footprints. These residual changes can alter the gene's coding sequence or regulatory elements, sometimes causing more severe mutations than the original insertion by disrupting gene function more extensively.
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03:38Maternal Effect
Local Genomic Instability Induced by Transposons
Transposon activity can induce genomic instability near the insertion site, including chromosomal rearrangements, duplications, or deletions. Such events can exacerbate mutant phenotypes by affecting multiple genes or regulatory regions, leading to more severe or novel mutations beyond simple insertional disruption.
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04:29Induced Mutations
Pratica correlata
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Describe how the Ames test screens for potential environmental mutagens. Why is it thought that a compound that tests positively in the Ames test may also be carcinogenic?
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Domanda del libro di testo
It is estimated that about 0.2 percent of human mutations are due to TE insertions, and a much higher degree of mutational damage is known to occur in some other organisms. In what way might a TE insertion contribute positively to evolution?
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Domanda del libro di testo
Presented here are hypothetical findings from studies of heterokaryons formed from seven human xeroderma pigmentosum cell strains:
These data are measurements of the occurrence or nonoccurrence of unscheduled DNA synthesis in the fused heterokaryon. None of the strains alone shows any unscheduled DNA synthesis. Which strains fall into the same complementation groups? How many different groups are revealed based on these data? What can we conclude about the genetic basis of XP from these data?
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Domanda del libro di testo
In a bacterial culture in which all cells are unable to synthesize leucine (leu⁻), a potent mutagen is added, and the cells are allowed to undergo one round of replication. At that point, samples are taken, a series of dilutions are made, and the cells are plated on either minimal medium or minimal medium containing leucine. The first culture condition (minimal medium) allows the growth of only leu⁺ cells, while the second culture condition (minimal medium with leucine added) allows growth of all cells. The results of the experiment are as follows:
What is the rate of mutation at the locus associated with leucine biosynthesis?
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Domanda del libro di testo
What genetic defects result in the disorder xeroderma pigmentosum (XP) in humans? How do these defects create the phenotypes associated with the disorder?
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