Textbook Question
What techniques can scientists use to determine if a particular transgene has been integrated into the genome of an organism?
Ch. 20 - Recombinant DNA Technology
Klug12th EditionConcepts of Genetics ISBN: 9780135564776
Not the one you use?Change textbookSelect a different textbook
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 20, Problem 24
One complication of making a transgenic animal is that the transgene may integrate at random into the coding region, or the regulatory region, of an endogenous gene. What might be the consequences of such random integrations? How might this complicate genetic analysis of the transgene?
Verified step by step guidance1
Understand that when a transgene integrates randomly into the genome, it can insert into different regions such as the coding region (exons) or regulatory region (promoters, enhancers) of an endogenous gene.
If the transgene inserts into the coding region of a gene, it may disrupt the normal function of that gene, potentially causing a loss-of-function mutation or producing a truncated or nonfunctional protein.
If the transgene inserts into the regulatory region of a gene, it may alter the gene's expression pattern, either increasing, decreasing, or misregulating the gene's activity, which can affect the phenotype.
These disruptions can cause unintended phenotypic effects unrelated to the transgene's intended function, making it difficult to distinguish whether observed traits are due to the transgene itself or due to disruption of endogenous genes.
This complicates genetic analysis because multiple independent transgenic lines may show different phenotypes depending on the integration site, requiring careful controls and possibly molecular characterization (e.g., mapping the insertion site) to interpret results accurately.
Verified video answer for a similar problem:
This video solution was recommended by our tutors as helpful for the problem above.
Video duration:
1mWas this helpful?
Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Transgene Integration Sites
Transgenes can insert randomly into the genome, either within coding regions (exons) or regulatory regions (promoters/enhancers) of endogenous genes. This random insertion can disrupt normal gene function or alter gene expression, leading to unintended phenotypic effects.
Recommended video:
Guided course
09:12
Transgenic Organisms and Gene Therapy
Gene Disruption and Mutagenesis
Insertion of a transgene into an endogenous gene can cause loss-of-function mutations by interrupting coding sequences or regulatory elements. This disruption may produce mutant phenotypes unrelated to the transgene’s intended function, complicating interpretation of experimental results.
Recommended video:
Guided course
09:09Mapping Genes
Complications in Genetic Analysis
Random integration can cause variable expression levels and unpredictable phenotypes due to position effects or gene disruption. This variability makes it difficult to attribute observed traits solely to the transgene, requiring careful controls and multiple independent lines for accurate genetic analysis.
Recommended video:
Guided course
02:48Chi Square Analysis
Related Practice
Textbook Question
When disrupting a mouse gene by knockout, why is it desirable to breed mice until offspring homozygous (−/−) for the knockout target gene are obtained?
1
views
Textbook Question
Gene targeting and gene editing are both techniques for removing or modifying a particular gene, each of which can produce the same ultimate goal. What is the main technical difference in how DNA is modified that differs between these approaches?
Textbook Question
What is the difference between a knockout animal and a transgenic animal?
Textbook Question
How is fluorescent in situ hybridization (FISH) used to produce a spectral karyotype?
Textbook Question
Traditional Sanger sequencing has largely been replaced in recent years by next-generation and third-generation sequencing approaches. Describe advantages of these sequencing methods over first-generation Sanger sequencing.
3
views