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Once a recombinant plasmid has been prepared, it must be introduced into a host cell.This process is called bacterial tr...
26/07/2026

Once a recombinant plasmid has been prepared, it must be introduced into a host cell.

This process is called bacterial transformation. 🦠🧬

Competent bacterial cells can take up plasmid DNA through methods such as heat shock or electroporation.

After transformation, the cells are allowed to recover and are then plated on selective growth media.

Only bacteria carrying the required selectable marker are expected to grow under the selection conditions.

Transformation connects DNA construction with plasmid replication inside living cells.

Recombinant DNA is formed by joining DNA from different sources into a single construct. 🧬In traditional restriction-bas...
26/07/2026

Recombinant DNA is formed by joining DNA from different sources into a single construct. 🧬

In traditional restriction-based cloning:

The plasmid vector is cut.
The target DNA fragment is prepared.
Compatible DNA ends are allowed to pair.
DNA ligase joins the fragments.
A recombinant plasmid is produced.

The final construct should contain the correct insert, orientation, sequence, and reading frame required for the experiment.

Careful planning at this stage can prevent many downstream problems.

How do researchers check the size of a DNA fragment?Agarose gel electrophoresis is one of the most commonly used methods...
26/07/2026

How do researchers check the size of a DNA fragment?

Agarose gel electrophoresis is one of the most commonly used methods. 🧬

Because DNA is negatively charged, it moves towards the positive electrode when an electric field is applied.

Smaller DNA fragments move through the gel more quickly and travel farther than larger fragments.

A DNA ladder is included as a reference to estimate the approximate size of the sample fragments.

Gel electrophoresis can be used to analyse PCR products, restriction digests, plasmid DNA, and purified DNA fragments.

PCR allows researchers to produce millions of copies of a selected DNA region. 🧪🧬A typical PCR reaction contains:Templat...
26/07/2026

PCR allows researchers to produce millions of copies of a selected DNA region. 🧪🧬

A typical PCR reaction contains:

Template DNA
Forward and reverse primers
DNA polymerase
Nucleotides
Reaction buffer

PCR involves repeated cycles of denaturation, primer annealing, and DNA extension.

For cloning, primers may also contain restriction sites, homologous regions, tags, or other additional sequences.

Good primer design is essential for obtaining a specific and accurate PCR product.

Save this post for your PCR and cloning revision.

After the vector and DNA insert are prepared, how are they joined together?The answer is DNA ligase. 🧬DNA ligase forms p...
26/07/2026

After the vector and DNA insert are prepared, how are they joined together?

The answer is DNA ligase. 🧬

DNA ligase forms phosphodiester bonds between adjacent DNA ends and helps create a continuous recombinant DNA molecule.

T4 DNA ligase is one of the most commonly used ligases in molecular cloning.

Successful ligation depends on factors such as compatible DNA ends, insert-to-vector ratio, DNA concentration, reaction temperature, and incubation time.

DNA ligase does not simply bring fragments together—it seals the final recombinant construct.

Restriction enzymes are often described as molecular scissors. ✂️🧬These enzymes recognise specific DNA sequences and cut...
26/07/2026

Restriction enzymes are often described as molecular scissors. ✂️🧬

These enzymes recognise specific DNA sequences and cut the DNA at or near those sites.

Some restriction enzymes produce sticky ends, while others produce blunt ends.

Sticky ends can base-pair with complementary DNA ends, which often makes it easier to insert a target DNA fragment into a plasmid vector.

Choosing the correct restriction enzyme is essential for successful cloning.

Save this post before planning your next restriction digestion.

Plasmids are among the most important tools in molecular cloning. 🔬A plasmid is a small, circular DNA molecule commonly ...
26/07/2026

Plasmids are among the most important tools in molecular cloning. 🔬

A plasmid is a small, circular DNA molecule commonly found in bacteria. In the laboratory, modified plasmids are used as vectors to carry foreign DNA into host cells.

A suitable cloning vector generally contains:

An origin of replication
A selectable marker
A multiple cloning site
Optional regulatory elements

Different vectors are designed for cloning, sequencing, gene expression, or protein production.

Which plasmid feature would you like us to explain next?

Before learning molecular cloning, we must first understand DNA. 🧬DNA is composed of nucleotides containing four nitroge...
26/07/2026

Before learning molecular cloning, we must first understand DNA. 🧬

DNA is composed of nucleotides containing four nitrogenous bases:

Adenine pairs with thymine.
Guanine pairs with cytosine.

A gene is a specific DNA sequence that carries the information required to produce a functional RNA or protein.

Identifying the correct target gene is one of the most important first steps in a cloning experiment.

Save this post for your molecular biology revision.

What exactly is molecular cloning? 🧬Molecular cloning is a laboratory technique used to isolate a specific DNA fragment,...
26/07/2026

What exactly is molecular cloning? 🧬

Molecular cloning is a laboratory technique used to isolate a specific DNA fragment, insert it into a vector such as a plasmid, and introduce it into a host cell for replication.

This technique is widely used in gene research, crop biotechnology, disease diagnosis, vaccine development, and protein production.

Follow the AgNext Molecular Cloning Series as we move from the basic concepts to advanced cloning strategies.

Save this post for revision and share it with a molecular biology student.

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