Problem 14 Explain how the immune system ca... [FREE SOLUTION]

Chapter 17: Problem 14

Explain how the immune system can respond to millions of different nonself antigens using only a few hundred antibody genes.

Short Answer

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The immune system can respond to millions of different nonself antigens by using a limited number of antibody genes through various mechanisms: V(D)J recombination allows the shuffling of gene segments in individual B cells; somatic hypermutation introduces point mutations to the variable regions of antibody genes; the combinatorial association of heavy and light chains provides another level of diversity.

Step by step solution

Understanding Basic Concepts

Nonself antigens are foreign materials that instigate an immune response. The immune system generates antibodies, which are proteins produced by B lymphocytes that can recognize and adhere to antigens to neutralize or eliminate them.

Explanation of Antibody Diversity

While the human genome has a limited number of antibody genes, these genes are organized into multiple segments that can rearrange and recombine in many ways. In individual B cells, the antibody gene segments are shuffled through a process called V(D)J recombination, which allows for the production of countless unique antibodies from a relatively small number of gene segments.

Importance of Somatic Hypermutation

After exposure to an antigen, the genes of an activated B cell undergo somatic hypermutation. This process results in point mutations to the variable regions, further increasing the diversity of the antibodies produced, and allowing the immune system to adapt and respond more effectively to an immense variety of antigens.

The Role of Combinatorial Association

Each antibody is composed of two heavy and two light chains. During synthesis, any light chain can pair with any heavy chain, leading to another level of diversity known as combinatorial association.

Summarizing the Mechanisms

The immune system can generate a vast array of distinct antibodies against numerous antigens due to the combined effects of V(D)J recombination, somatic hypermutation, and combinatorial association.

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Explain how the immune system can respond to millions of different nonself antigens using only a few hundred antibody genes.

Short Answer

Step by step solution

Understanding Basic Concepts

Explanation of Antibody Diversity

Importance of Somatic Hypermutation

The Role of Combinatorial Association

Summarizing the Mechanisms

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