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Related Concept Videos

The JAK-STAT Signaling Pathway01:20

The JAK-STAT Signaling Pathway

Several cytokine receptors have tightly bound Janus kinase or JAK proteins attached at their cytosolic tail. Small signaling molecules such as cytokines, growth hormones, or prolactins bind to the cytokine receptors and initiate their dimerization. The dimerization brings the cytosolic JAKs together that trans-phosphorylate and activates each other. The activated JAKs now phosphorylate cytosolic tails of the cytokine receptors, which serve as binding sites for adaptor proteins such as  SH2...
Interactions Between Signaling Pathways01:19

Interactions Between Signaling Pathways

Signaling cascades usually lack linearity. Multiple pathways interact and regulate one another, allowing cells to integrate and respond to diverse environmental stimuli.
Convergence and divergence, and cross-talk between signaling pathways
Two distinct signaling pathways can converge on a single functional unit, which may either be a single protein or a complex of proteins. The response is either functionally distinct or synergistic between the two pathways but different from the response...
B Cell Activation and Differentiation01:24

B Cell Activation and Differentiation

The adaptive immune response, a sophisticated defense mechanism, relies on the activation and differentiation of B lymphocytes, or B cells. These processes enable our bodies to mount a tailored response against specific pathogens such as bacteria, free virus particles, toxins, and parasites.
When naive B cells encounter a specific antigen that can bind to the B cell receptor (BCR) on their surface, they undergo sensitization to respond to the antigen's presence. Sensitization begins with...
Amplifying Signals via Enzymatic Cascade01:22

Amplifying Signals via Enzymatic Cascade

When a ligand binds to a cell-surface receptor, the receptor's intracellular domain changes shape, which may either activate its enzyme function or allow its binding to other molecules. The initial signal is amplified by most signal transduction pathways. This means that a single ligand molecule can activate multiple molecules of a downstream target. Proteins that relay a signal are most commonly phosphorylated at one or more sites, activating or inactivating the protein. Kinases catalyze the...
Diversity in Cell Signaling Responses01:22

Diversity in Cell Signaling Responses

The physiological function of a cell and cellular communication are outcomes of a range of extrinsic signals, intracellular signaling pathways, and cellular responses. No two cell types express the same repertoire of signaling components. Receptors are highly selective for their cognate ligands, but once activated, they can alter multiple cellular processes such as DNA transcription, protein synthesis, and metabolic activity. 
Graded and Abrupt Responses
Some signaling systems generate...
Overview of Cell Signaling01:23

Overview of Cell Signaling

Despite the protective membrane that separates a cell from the environment, cells need the ability to detect and respond to environmental changes. Additionally, cells often need to communicate with one another. Unicellular and multicellular organisms use a variety of cell signaling mechanisms to communicate with the environment.
Cells respond to many types of information, often through receptor proteins positioned on the membrane. For example, skin cells respond to and transmit touch...

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Related Experiment Video

Updated: Jun 24, 2026

Isolation and Activation of Murine Lymphocytes
08:08

Isolation and Activation of Murine Lymphocytes

Published on: October 30, 2016

Lymphocyte signaling: beyond knockouts.

Alexander Saveliev1, Victor L J Tybulewicz

  • 1Medical Research Council National Institute for Medical Research, London, UK.

Nature Immunology
|March 20, 2009
PubMed
Summary

Gene targeting using knock-in point mutations offers a more precise method than gene knockouts for studying lymphocyte signaling pathways. This approach reveals detailed protein functions by introducing specific genetic alterations based on structural data.

Area of Science:

  • Immunology
  • Molecular Biology
  • Biochemistry

Background:

  • Gene targeting revolutionized lymphocyte signaling analysis by enabling selective gene inactivation (gene knockout).
  • However, gene knockouts can obscure protein function due to pleiotropic effects or stabilization of protein complexes, leading to complex phenotypes.
  • A complete understanding of protein function often requires more nuanced genetic approaches.

Purpose of the Study:

  • To highlight the limitations of the gene knockout approach in fully elucidating protein function in lymphocyte signaling.
  • To propose gene targeting via subtle point mutations (gene knock-in) as a superior method for detailed functional analysis.
  • To emphasize the necessity of structural and biophysical data for designing informative gene knock-in mutations.

Main Methods:

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Draining Lymph Node Metastasis Model for Assessing the Dynamics of Antigen-Specific CD8+ T Cells During Tumorigenesis

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  • Review and analysis of existing gene targeting methodologies in lymphocyte research.
  • Comparison of phenotypic outcomes between gene knockout and gene knock-in strategies.
  • Discussion of the role of structural and biophysical data in guiding targeted mutagenesis.

Main Results:

  • Gene knockout phenotypes can be multifactorial, masking the specific roles of individual proteins.
  • Gene knock-in mutations, when designed appropriately, can dissect specific protein functions within complex signaling networks.
  • The effectiveness of gene knock-in relies heavily on prior knowledge of protein structure and biophysics.

Conclusions:

  • Gene knock-in represents a more refined tool than gene knockout for dissecting complex protein functions in lymphocyte signaling.
  • Careful design of point mutations, informed by structural biology, is crucial for generating meaningful insights.
  • This approach enhances the accuracy of functional analysis in molecular immunology and signaling research.