概括
研究人员分离了小鼠T细胞受体β链基因,发现了两个常数基因和六个功能连接基因段. 这两种恒定基因都显得功能正常,在两种连接的基因段集群中都可能发生重新排列.
科学领域:
- 免疫学 免疫学 免疫学
- 分子生物学分子生物学
- 遗传学 遗传学 是一个
背景情况:
- T细胞受体 (TCR) 对于适应性免疫至关重要.
- 了解TCRβ链的遗传组织对于破译免疫反应至关重要.
研究的目的:
- 隔离和描述小鼠TCRβ链的生殖线连接 (J) 基因段和常数 (C) 基因.
- 为了研究这些基因的核酸序列和外子-内子结构.
- 分析T淋巴细胞中的DNA重组.
主要方法:
- 体克隆以分离TCRβ链基因段.
- 对Cβ2和Jβ2基因段的核酸测序.
- 针对Cβ1,Cβ2,Jβ1和Jβ2区域的特定DNA探针的隔离.
- 检查T淋巴细胞中DNA重组的情况.
主要成果:
- 隔离的小鼠TCRβ链J基因段和C基因在一个单一的宇宙克隆上.
- 确定了两个Cβ基因 (Cβ1和Cβ2),每个基因都有相关的Jβ基因段.
- 确定了Cβ2和Jβ2集群的核酸序列,揭示了Cβ2和Cβ1编码序列之间的高度相似性.
- 发现Cβ2基因有四个外子,外子-内子结构与蛋白质域没有直接相关.
- Jβ2集群包含六个功能性的J基因段.
- 证明了DNA重组可以发生在Jβ基因段集群中.
- 这两种Cβ基因似乎都是功能性的.
结论:
- 小鼠TCRβ链的遗传组织包括两个功能Cβ基因和多个Jβ段.
- 涉及这些段的DNA重排在Jβ中都是可行的,这有助于TCR多样性.
- 这些发现为进一步研究TCR基因调节和T细胞发育和免疫中的功能提供了基础.
相关概念视频
Antibody Structure
Overview
Antibodies, also known as immunoglobulins (Ig), are essential players of the adaptive immune system. These antigen-binding proteins are produced by B cells and make up 20 percent of the total blood plasma by weight. In mammals, antibodies fall into five different classes, which each elicits a different biological response upon antigen binding.
The Y-Shaped Structure of Antibodies Consists of Four Polypeptide Chains
Antibodies consist of four polypeptide chains: two identical heavy...
Antibodies, also known as immunoglobulins (Ig), are essential players of the adaptive immune system. These antigen-binding proteins are produced by B cells and make up 20 percent of the total blood plasma by weight. In mammals, antibodies fall into five different classes, which each elicits a different biological response upon antigen binding.
The Y-Shaped Structure of Antibodies Consists of Four Polypeptide Chains
Antibodies consist of four polypeptide chains: two identical heavy...
Antibody Structure
Overview
Antibodies, also known as immunoglobulins (Ig), are essential players of the adaptive immune system. These antigen-binding proteins are produced by B cells and make up 20 percent of the total blood plasma by weight. In mammals, antibodies fall into five different classes, which each elicits a different biological response upon antigen binding.
The Y-Shaped Structure of Antibodies Consists of Four Polypeptide Chains
Antibodies consist of four polypeptide chains: two identical heavy...
Antibodies, also known as immunoglobulins (Ig), are essential players of the adaptive immune system. These antigen-binding proteins are produced by B cells and make up 20 percent of the total blood plasma by weight. In mammals, antibodies fall into five different classes, which each elicits a different biological response upon antigen binding.
The Y-Shaped Structure of Antibodies Consists of Four Polypeptide Chains
Antibodies consist of four polypeptide chains: two identical heavy...
Antigens Involved in Adaptive Immunity
An antigen is any substance the immune system identifies as foreign and potentially harmful to the body, prompting an immune response. Antigens have two functional properties: immunogenicity and reactivity. Immunogenicity is the ability of an antigen to stimulate a specific immune response. At the same time, reactivity describes the antigen's ability to react with the cells and antibodies produced in response to it.
Complete Antigens
Complete antigens possess both immunogenicity and reactivity.
Complete Antigens
Complete antigens possess both immunogenicity and reactivity.
Diversity of Antigen Receptors
Antigen receptors are essential components of the immune system crucial in defending the body against foreign invaders. These receptors are present on the surface of B and T cells, enabling them to recognize antigens and mount an appropriate immune response.
Before encountering any antigen, lymphocytes express these receptors. On B cells, the antigen receptor is a membrane-bound antibody molecule called BCR; on T cells, it is a T cell receptor or TCR. B and T cell receptors are composed of two...
Before encountering any antigen, lymphocytes express these receptors. On B cells, the antigen receptor is a membrane-bound antibody molecule called BCR; on T cells, it is a T cell receptor or TCR. B and T cell receptors are composed of two...
Antigen Presenting Cells
The immune system is a complex network of cells and molecules that protects the body from foreign invaders. T cells, a type of white blood cell, play a crucial role in this process. They recognize and attack foreign substances, such as pathogens, that enter the body.
T cells require the help of antigen-presenting cells (APCs), which process foreign antigens into smaller fragments that can be recognized by T cells. These APCs are highly specialized cells that efficiently internalize antigens...
T cells require the help of antigen-presenting cells (APCs), which process foreign antigens into smaller fragments that can be recognized by T cells. These APCs are highly specialized cells that efficiently internalize antigens...
T Cell Activation and Clonal Selection
T cells are integral to our adaptive immune system, recognizing and effectively responding to foreign antigens. T cell activation and clonal selection are pivotal in orchestrating this immune response. This article elucidates these mechanisms, detailing the roles of cluster of differentiation (CD) markers, major histocompatibility complex (MHC) molecules, costimulatory signals, and the process of clonal selection.
Naive T cells that have not yet encountered an antigen express two primary CD...
Naive T cells that have not yet encountered an antigen express two primary CD...


