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Chapter 17: Problem 20

What techniques can scientists use to determine if a particular transgene has been integrated into the genome of an organism?

Short Answer

Expert verified
Answer: Some techniques scientists can use to determine if a transgene has been integrated into an organism's genome include Polymerase Chain Reaction (PCR), Southern Blotting, Fluorescent In Situ Hybridization (FISH), Genome Sequencing, and Phenotypic Analysis.

Step by step solution

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1. Polymerase Chain Reaction (PCR)

PCR is a technique that can be used to amplify specific DNA sequences, such as the transgene of interest. By using primers that bind to the transgene, scientists can amplify a DNA sequence containing the transgene and compare it to a control sample without the transgene. If the sequence is amplified, it indicates the transgene has been integrated into the organism's genome.
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2. Southern Blotting

Southern blotting is another technique that can be used to detect specific DNA sequences, such as a transgene, within a larger genome. DNA from the organism is isolated, digested with restriction enzymes, and separated by size through gel electrophoresis. The resulting DNA fragments are then transferred to a membrane and hybridized with a probe that specifically binds to the transgene. If the transgene has been integrated, a band corresponding to the transgene will be visible on the membrane.
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3. Fluorescent In Situ Hybridization (FISH)

FISH is a technique that involves visualizing specific DNA sequences within the chromosomes of an organism. Fluorescently labeled probes specific to the transgene are incubated with the organism's chromosomes, which are then examined under a fluorescence microscope. If the transgene has been integrated into the organism's genome, the probe will bind to the specific DNA sequence, producing a visible fluorescent signal.
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4. Genome Sequencing

Through genome sequencing, the entire DNA sequence of an organism can be determined. By comparing the DNA sequence of the organism with the transgene-containing genome to a reference genome (without the transgene), the presence of the transgene can be confirmed. This technique is highly accurate but can be more time-consuming and costly compared to other methods.
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5. Phenotypic Analysis

In some cases, the integration of a transgene can result in changes in the observable characteristics or functions of an organism. By comparing the phenotypic traits of organisms with and without the transgene, it may be possible to infer the successful integration of the transgene. However, this method may not always be definitive, as other factors could also lead to phenotypic changes.

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Most popular questions from this chapter

In this chapter we focused on how specific DNA sequences can be copied, identified, characterized, and sequenced. At the same time, we found many opportunities to consider the methods and reasoning underlying these techniques. From the explanations given in the chapter, what answers would you propose to the following fundamental questions? (a) In a recombinant DNA cloning experiment, how can we determine whether DNA fragments of interest have been incorporated into plasmids and, once host cells are transformed, which cells contain recombinant DNA? (b) What steps make PCR a chain reaction that can produce millions of copies of a specific DNA molecule in a matter of hours without using host cells? (c) How has DNA-sequencing technology evolved in response to the emerging needs of genome scientists? (d) How can gene knockouts, transgenic animals, and geneediting techniques be used to explore gene function?

One complication of making a transgenic animal is that the transgene might 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?

What is the difference between a knockout animal and a transgenic animal?

Gene targeting and genome editing are both techniques for removing or modifying a particular gene, each of which can produce the same ultimate goal. Describe some of the differences between the experimental methods used for these two techniques.

If you performeda PCR experimentstarting withonly onecopy of double-stranded DNA, approximately how many DNA molecules would be present in the reaction tube after 15 cycles of amplification?
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