Loading the lesson
Loading the lesson
Search AllRounder.ai
Search the courses, subjects, tracks, games and features, or jump straight to a page.
Search the courses, subjects, tracks, games and features, or jump straight to a page.
Learn it your way
A short class with Sarah and her students. The other ways are under More.
Sign up free to listen. Transcripts are free to read.
Today, we're going to learn about how we insert recombinant DNA into host organisms. Can anyone remind me why we would want to do this?
To give the host new traits, like making a plant resistant to diseases!
Exactly! We can transform these organisms to produce useful proteins or resist certain conditions. Let's discuss how we achieve this process.
Before we insert the rDNA into host cells, we need to make them competent. Who can tell me one method to do this?
Using calcium chloride to increase the efficiency of DNA uptake?
That's right! This treatment allows the DNA to enter the cells more readily. Once the cells take up the rDNA, they can start expressing the traits encoded by that DNA.
Once we introduce rDNA into our competent cells, what helps us determine which cells accepted the new DNA?
The selectable markers! Like the antibiotic resistance gene!
Exactly! For instance, if we insert a gene for ampicillin resistance into E. coli, only the transformed cells will survive on agar plates containing ampicillin.
What are some practical applications of these methods in biotechnology?
We can create insulin-producing bacteria or grow crops that can withstand herbicides!
Exactly! This technology is vital for pharmaceuticals, agriculture, and numerous other fields.
The ability of bacteria to survive in the presence of antibiotics due to the introduction of resistance genes.
A series of steps through which host cells take up recombinant DNA.
Specific genes that allow for the identification of successfully transformed cells.
Transform, conform, in antibiotics we’re reborn!
Imagine a bacterium, weak and small, finds a magic ring (the rDNA) that makes it strong, able to thrive in an antibiotic storm.
CARS - Competent bacteria, Antibiotic resistant, Recombinant DNA, Selectable markers.
TRAMP - Transformation, Resistance, Antibiotics, Markers, Process.
Term
What is a selectable marker?
Click to flip
Term
How do competent cells differ from regular cells?
Click to flip
A form of DNA that is created by combining DNA from different organisms.
Cells that have been treated to be able to take up DNA from their environment.
A gene that helps to identify and select transformed cells by providing a survival advantage under specific conditions.
The process of introducing rDNA into a host cell.
This section discusses methods for introducing recombinant DNA into host cells, enabling them to express desired traits, particularly antibiotic resistance.
The text outlines various techniques used for inserting recombinant DNA into host organisms, which are crucial for transforming these organisms into recombinant varieties that exhibit traits such as antibiotic resistance. It highlights the importance of selectable markers for identification and selection of successfully transformed cells.
The process of inserting recombinant DNA (rDNA) into host cells involves a series of strategies that ensure the successful transformation of organisms. First, hosts are made 'competent', meaning they can uptaking DNA from their surroundings. If a recombinant DNA containing a gene for antibiotic resistance (like ampicillin) is introduced into cells like Escherichia coli, these cells become resistant to that antibiotic. When cultured on ampicillin-containing agar plates, only those transformed by the recombinant DNA survive, allowing for easy identification of successful transformations. This antibiotic resistance gene serves as a selectable marker, streamlining the identification process of transformed cells. Understanding this process is fundamental in biotechnological applications, as it lays the groundwork for producing organisms engineered for specific purposes.