T Cell Receptor (TCR) Characteristics

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Questions and Answers

What is the main purpose of Igα and Igβ in B lymphocytes?

To transmit signals to the interior of the B cell

To initiate the process of B cell activation (correct)

To produce monoclonal antibodies

To bind with the antigen

Which molecules combine with the membrane Ig to make up the BCR complex?

Antigens

Igα and Igβ (correct)

Heavy chains and light chains

Monoclonal antibodies

What is the significance of monoclonal antibodies in immunology?

They bind with multiple antigens simultaneously

They are produced by fusing B cells with myeloma cells

They have far-reaching applications in clinical medicine and research (correct)

They have limited applications in clinical medicine and research

What is the process used to produce monoclonal antibodies?

Obtaining B cells from an animal immunized with an antigen and fusing them with myeloma cells Signup and view all the answers

What type of cells are formed from the fusion of myeloma and normal B cell nuclei?

Hybrid cells Signup and view all the answers

Which type of cells produce antibodies like normal B cells?

Hybridomas Signup and view all the answers

What is the main advantage of monoclonal antibodies produced from hybridomas?

Homogeneous antibodies Signup and view all the answers

In the production of monoclonal antibodies, what cells are fused with an enzyme-deficient myeloma cell line?

Spleen cells from a mouse immunized with an antigen Signup and view all the answers

What issue is partially overcome by humanized antibodies?

Immune response to mouse Ig Signup and view all the answers

What kind of molecules does T Cell Receptor (TCR) recognize?

Peptide antigens displayed by Major Histocompatibility Complex (MHC) molecules Signup and view all the answers

What is the composition of TCR (T Cell Receptor)?

A membrane-bound heterodimeric protein composed of an α chain and a β chain Signup and view all the answers

What is the function of associated proteins (CD3 and ζ) and coreceptors (CD4 or CD8) in T Cell Receptor (TCR) function?

Signal initiation and MHC recognition Signup and view all the answers

What is the most variable region among different TCRs?

CDR3 Signup and view all the answers

How do TCR and B cell receptor (antibodies) differ?

Antigen recognition, affinity, and structure Signup and view all the answers

What type of cells recognize both MHC molecules and bound peptides for antigen specificity and restriction?

TCR (T Cell Receptor) Signup and view all the answers

Which type of antibodies are widely used as therapeutic and diagnostic agents?

Monoclonal antibodies Signup and view all the answers

During B cell maturation, which of the following gene segments recombines with a J segment to form a DJ complex?

D segment Signup and view all the answers

Which enzyme mediates the somatic recombination of V and J, or of V, D and J, gene segments?

VDJ recombinase Signup and view all the answers

Which part of the VDJ recombinase recognizes the heptamer sequences?

RAG-1 protein Signup and view all the answers

Which gene segments are lacking in the light-chain loci, leading to direct recombination of a V region gene segment with a J segment?

D segments Signup and view all the answers

Which gene segments are responsible for forming a complete μ messenger RNA (mRNA) in B cells?

VDJ exon and C-region exons Signup and view all the answers

Which cells express intact Ig heavy-chain and light-chain genes?

B cells Signup and view all the answers

Which gene segments are found in the Ig kappa chain locus?

V, J, C Signup and view all the answers

Which chain locus contains L, V 1, L V n, J 1, C 1, J 2, C 2, J 3, C 3, J 7, and C 7?

Ig lambda chain locus Signup and view all the answers

Which statement is true regarding TCR alpha and beta genes?

Expressed only in T cells Signup and view all the answers

What is the function of the VDJ recombinase in mature lymphocytes?

Expresses intact Ig heavy-chain and light-chain genes Signup and view all the answers

Which subset of T cells express γ and δ chains, forming receptors with unique specificities that can recognize a variety of antigens, including non-protein antigens?

Natural killer T (NK-T) cells Signup and view all the answers

What is the function of mucosal associated invariant T (MAIT) cells?

Recognize bacterially derived vitamin B metabolites bound to an MHC-like protein Signup and view all the answers

What is the distinguishing feature of TCRs compared to membrane antibodies?

Both chains are anchored in the plasma membrane Signup and view all the answers

Which type of cells account for 5-10% of T cells and express γ and δ chains?

MAIT cells Signup and view all the answers

What is the main characteristic of T cells expressing both αβ TCRs and surface molecules of natural killer cells?

Recognize lipid antigens displayed by CD1 Signup and view all the answers

What is the approximate percentage of MAIT cells among liver T cells in humans?

40% Signup and view all the answers

Which subset of T cells recognize bacterially derived vitamin B metabolites bound to an MHC-like protein called MR1?

MAIT cells Signup and view all the answers

What is the specific function of γδ cells, NK-T cells, and MAIT cells?

Not well understood Signup and view all the answers

Which developmental stage involves the activation of specific transcription factors and increased gene accessibility?

Commitment to B or T cell lineage Signup and view all the answers

Where do B and T lymphocytes mature despite undergoing similar developmental processes?

Bone marrow for B cells, thymus for T cells Signup and view all the answers

What stimulates survival and proliferation of earliest lymphocyte precursors?

Growth factors produced by stromal cells Signup and view all the answers

What is necessary for survival and progenitors' proliferation during lymphocyte development?

Functional antigen receptors Signup and view all the answers

How is diversity generated in Ig and TCR genes?

Through somatic recombination Signup and view all the answers

What eliminates self-reactive or non-functional cells during lymphocyte development?

Selection processes Signup and view all the answers

Study Notes

Lymphocyte development involves the commitment of hematopoietic progenitors to B or T cell lineage, proliferation, gene rearrangement, and selection.
B and T lymphocytes undergo similar developmental processes despite maturing in different locations (bone marrow for B cells, thymus for T cells).
Commitment to B or T cell lineage is associated with the activation of specific transcription factors and increased gene accessibility.
Proliferation of developing lymphocytes occurs at multiple stages and is necessary for generating a diverse pool of cells.
Growth factors produced by stromal cells stimulate survival and proliferation of earliest lymphocyte precursors.
Gene rearrangements randomly generate diverse antigen receptor specificities.
Selection processes allow only useful specificities to fully mature, eliminating self-reactive or non-functional cells through positive and negative selection.
Functional antigen receptors are necessary for survival and progenitors' proliferation, while cells that fail to express them undergo apoptosis.
Ig and TCR genes are inherited in a germline configuration, and diversity is generated through somatic recombination.
Each Ig and TCR gene locus contains multiple V region gene segments and one or a few C region genes.

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Description

Test your knowledge of T cell receptor (TCR) characteristics with this quiz. Learn about the differences between TCRs and membrane antibodies, TCR chain anchoring, TCR production, and the unique features of γδ TCRs.