Immunology Class Switching Flashcards

Questions and Answers

Is class switching the same as VDJ recombination?

False

B cells can ________ the type of heavy chain they use for their antibodies during an immune response.

change

Where does class switching occur?

secondary lymphoid organs

What does class switching ensure?

that only 1 receptor is expressed on the surface Signup and view all the answers

Is the variable heavy chain affected in class switching?

False Signup and view all the answers

What immunoglobulin do all B cells start by secreting?

IgM Signup and view all the answers

Activated B cells presenting antigen to T helper cells receive cytokine signals that induce them to __________________ to other isotypes.

class-switch Signup and view all the answers

What is required for class switching?

CD40/CD40L Signup and view all the answers

Is the part not involved in VDJ recombination still involved in the genome?

True Signup and view all the answers

To switch to a new isotype, the intervening heavy chain ________ regions have to be cut out of the DNA.

constant Signup and view all the answers

Does class switching use the same or different enzymes than VDJ recombination?

False Signup and view all the answers

Where can recombination take place?

between switch regions Signup and view all the answers

_______________ DNA is cut out and a new constant region is placed adjacent to the VDJ region.

intervening Signup and view all the answers

What influences the class of antibody made by B cells?

type of cytokine produced by T helper cell Signup and view all the answers

Study Notes

Class Switching Overview

Class switching is a process allowing B cells to change the type of heavy chain expressed in their antibodies during an immune response.
It ensures that only one receptor is expressed on the surface of each B cell, maintaining specificity in immune responses.

Mechanism of Class Switching

Activated B cells present antigens to T helper cells and receive cytokine signals that induce them to switch to other antibody isotypes.
Class switching occurs primarily in secondary lymphoid organs, such as lymph nodes and spleens.
In class switching, intervening heavy chain constant regions are removed from the DNA, placing downstream constant regions adjacent to the recombined variable domain.

Genetic Implications

The variable heavy chain remains unaffected during class switching; only constant regions are modified.
Different enzymes are used for class switching compared to VDJ recombination, involving specific mechanisms for heavy chain rearrangement.
Recombination can occur between switch regions within the DNA to facilitate the switch to different antibody isotypes.

Immunological Context

All B cells initially secrete IgM antibodies before undergoing class switching.
CD40/CD40L interactions are essential for the class switching process.
The type of cytokine produced by T helper cells influences which class of antibody is made by B cells.

Description

Test your knowledge on class switching in immunology with these flashcards. Learn about the mechanisms involved, such as VDJ recombination, and the role of B cells in antibody production. Perfect for students studying advanced immunology concepts.