Who proposed the clonal selection theory of acquired immunity?
Who proposed the clonal selection theory of acquired immunity?
Australian immunologist Frank Macfarlane Burnet, with input from David W. Talmage, worked on this model and was the first to name it “clonal selection theory. ” Burnet explained immunological memory as the cloning of two types of lymphocyte.
What does the clonal selection theory explain?
Clonal selection theory is a scientific theory in immunology that explains the functions of cells of the immune system (lymphocytes) in response to specific antigens invading the body. In short, the theory is an explanation of the mechanism for the generation of diversity of antibody specificity.
What is clonal expansion theory?
Clonal expansion is the process by which daughter cells arise from a parent cell. During B cell clonal expansion, many copies of that B cell are produced that share affinity with and specificity of the same antigen.
Is clonal selection the same as clonal expansion?
When an antigen encounters the immune system, its epitopes eventually will react only with B-lymphocytes with B-cell receptors on their surface that more or less fit and this activates those B-lymphocytes. This process is known as clonal selection (Figure 13.1E. This is referred to as clonal expansion (Figure 13.1E.
What is meant by clonal?
(klōn) 1. A group of cells or organisms that are descended from and genetically identical to a single progenitor, such as a bacterial colony whose members arose from a single original cell.
What is the difference between clonal selection and clonal expansion?
Clonal selection is the theory that specific antigen receptors exist on lymphocytes before they are presented with an antigen due to random mutations during initial maturation and proliferation. After antigen presentation, selected lymphocytes undergo clonal expansion because they have the needed antigen receptor.
What is clonal selection and clonal expansion?
Why is clonal expansion so important?
Clonal expansion of lymphocytes is a hallmark of vertebrate adaptive immunity. A small number of precursor cells that recognize a specific antigen proliferate into expanded clones, differentiate and acquire various effector and memory phenotypes, which promote effective immune responses.
Why does clonal selection occur?
Which of the following is an example of artificially acquired passive immunity?
Passive immunity can occur naturally, such as when an infant receives a mother’s antibodies through the placenta or breast milk, or artificially, such as when a person receives antibodies in the form of an injection (gamma globulin injection).
