Horizontal gene transfer (HGT) in prokaryotes refers to the movement of genetic material between organisms, bypassing traditional reproduction. This m

What is horizontal gene transfer (HGT) in prokaryotes?

HGT refers to the movement of genetic material between organisms, bypassing traditional reproduction.

What are the three main types of horizontal gene transfer?

Transformation, Transduction, and Conjugation.

What is transformation in the context of horizontal gene transfer?

Transformation is the uptake of free DNA from the environment by a prokaryotic cell.

How do prokaryotes such as Streptococcus pneumoniae acquire resistance to penicillin?

Through transformation, by integrating DNA fragments from lysed cells.

What is transduction?

Transduction is the transfer of genetic material between bacteria via bacteriophages.

What is generalized transduction?

During the lytic cycle, bacterial DNA is accidentally packaged into a viral capsid and transferred to another bacterium.

What is specialized transduction?

This occurs during the lysogenic cycle when prophage excision can carry adjacent bacterial genes and transfer them to a new host.

How can transduction affect human health?

It can disseminate genes for toxins or antibiotic resistance.

What is conjugation in bacteria?

Conjugation is the direct transfer of DNA between two bacterial cells through a physical connection called a pilus.

What role does the F plasmid play in conjugation?

The F plasmid allows the donor cell to produce a pilus to connect with the recipient cell.

What are some serious consequences of horizontal gene transfer for humans?

It can lead to antibiotic resistance, increased pathogenicity, and public health threats.

How does horizontal gene transfer contribute to antibiotic resistance?

It allows rapid dissemination of resistance genes, resulting in multidrug-resistant pathogens.

What is the consequence of virulence factor acquisition via horizontal gene transfer?

Previously harmless bacteria can become pathogenic, such as Vibrio cholerae gaining toxin production ability.

Why is horizontal gene transfer a public health threat?

It complicates infection control and treatment, leading to higher morbidity, mortality, and healthcare costs.