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Chapter 6: Problem 10

Describe the role of heteroduplex formation during transformation.

Short Answer

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Answer: Heteroduplex formation plays a crucial role in bacterial transformation by facilitating the incorporation of foreign DNA into the recipient cell's genome. It occurs when the foreign DNA and the recipient DNA share sufficient sequence similarity, allowing them to pair up and form heteroduplexes. This process, followed by DNA repair and recombination, results in a genetically transformed cell with new genetic information that may confer new functions or traits. Heteroduplex formation is important for genetic diversity and adaptation, as it allows bacteria to acquire new genetic information, enabling them to adapt to environmental changes and evolve.

Step by step solution

01

Importance of Transformation in Bacteria

Transformation is a natural process in many bacteria, allowing them to uptake foreign DNA from the environment and incorporate it into their own genome. This process enables genetic diversity, adaptation, and evolution within the bacterial population.
02

DNA Uptake

During transformation, the bacterial cell takes up the foreign DNA from its surrounding environment through its membrane. This DNA uptake is facilitated by specific proteins on the bacterial cell surface that recognize and bind to the foreign DNA molecule.
03

Heteroduplex Formation

Once the foreign DNA is inside the cell, it can form a heteroduplex with the recipient cell's DNA. A heteroduplex is a double-stranded DNA molecule where one strand comes from the foreign DNA and the other from the recipient cell's DNA. Heteroduplex formation occurs when the foreign DNA and the recipient DNA share sufficient sequence similarity, allowing them to pair up and form heteroduplexes.
04

DNA Repair and Recombination

The heteroduplex DNA molecule may contain mismatches or gaps due to differences between the foreign DNA sequence and that of the recipient cell. These differences are resolved by the recipient cell's DNA repair system, which removes the mismatches or gaps and replaces them with the correct nucleotides. The repaired heteroduplex is then recombined with the recipient cell's genome, effectively incorporating the foreign DNA into its own.
05

Resulting Genetic Change

Once the foreign DNA is stably incorporated into the recipient cell's genome through recombination, the result is a genetically transformed cell with new genetic information that may confer new functions or traits. This genetic change allows for increased adaptation, genetic diversity, and evolution within the bacterial population. In summary, heteroduplex formation plays a crucial role in the transformation process by facilitating the incorporation of foreign DNA into the recipient cell's genome, ultimately leading to genetic change and adaptation.

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Most popular questions from this chapter

Influenza (the flu) is responsible for approximately 250,000 to 500,000 deaths annually, but periodically its toll has been much higher. For example, the 1918 flu pandemic killed approximately 30 million people worldwide and is considered the worst spread of a deadly illness in recorded history. With highly virulent flu strains emerging periodically, it is little wonder that the scientific community is actively studying influenza biology. In \(2007,\) the National Institute of Allergy and Infectious Diseases completed sequencing of 2035 human and avian influenza virus strains. Influenza strains undergo recombination as described in this chapter, and they have a high mutation rate owing to the error-prone replication of their genome (which consists of RNA rather than DNA). In addition, they are capable of chromosome reassortment in which various combinations of their eight chromosomes (or portions thereof) can be packaged into progeny viruses when two or more strains infect the same cell. The end result is that we can make vaccines, but they must change annually, and even then, we can only guess at what specific viral strains will be prevalent in any given year. Based on the above information, consider the following questions: (a) Of what evolutionary value to influenza viruses are high mutation and recombination rates coupled with chromosome reassortment? (b) Why can't humans combat influenza just as they do mumps, measles, or chicken pox? (c) Why are vaccines available for many viral diseases but not influenza?

With respect to \(\mathrm{F}^{+}\) and \(\mathrm{F}^{-}\) bacterial matings, answer the following questions: (a) How was it established that physical contact between cells was necessary? (b) How was it established that chromosome transfer was unidirectional? (c) What is the genetic basis for a bacterium's being \(\mathrm{F}^{+}\) ?

An Hfr strain is used to map three genes in an interrupted mating experiment. The cross is \(H f r / a^{+} b^{+} c^{+} r i f \times F^{-} / a^{-} b^{-} c^{-}\) rif \(^{r} .\) (No map order is implied in the listing of the alleles; rif \(^{r}\) is resistance to the antibiotic rifampicin.) The \(a^{+}\) gene is required for the biosynthesis of nutrient \(\mathrm{A}\), the \(b^{+}\) gene for nutrient \(\mathrm{B}\), and \(c^{+}\) for nutrient \(\mathrm{C}\). The minus alleles are auxotrophs for these nutrients. The cross is initiated at time \(=0\) and at various times, the mating mixture is plated on three types of medium. Each plate contains minimal medium \((\mathrm{MM})\) plus rifampicin plus specific supplements that are indicated in the following table. (The results for each time interval are shown as the number of colonies growing on each plate. (a) What is the purpose of rifampicin in the experiment? (b) Based on these data, determine the approximate location on the chromosome of the \(a, b,\) and \(c\) genes relative to one another and to the F factor. (c) Can the location of the rif gene be determined in this experiment? If not, design an experiment to determine the location of rif relative to the \(\mathrm{F}\) factor and to gene \(b\)

Describe how different strains of \(E .\) coli can reveal different linkage arrangements of genes in Hfr crosses.

Define plaque, lysogeny, and prophage.
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