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Related Concept Videos

Cells of the Adaptive Immune Response01:23

Cells of the Adaptive Immune Response

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The T and B lymphocytes of the adaptive immune system develop from common lymphoid progenitor cells in the bone marrow. These progenitors give rise to precursors that eventually develop into both T and B lymphocytes. As these precursors mature, they gain the ability to detect and respond to foreign antigens in the body, a process known as immunocompetence. Additionally, these precursors acquire self-tolerance, a process that ensures they do not react to self-antigens. This intricate system...
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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.
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Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
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Updated: Jul 11, 2025

Lineage Tracing and Clonal Analysis in Developing Cerebral Cortex Using Mosaic Analysis with Double Markers MADM
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Partial Clonality Expands the Opportunity for Spatial Adaptation.

Maria E Orive, Michael Barfield, Robert D Holt

    The American Naturalist
    |November 14, 2023
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    Summary
    This summary is machine-generated.

    Mixed reproduction and clonal dispersal aid adaptation in changing environments. Greater clonal reproduction and specific dispersal patterns enhance population adaptation, especially in spatially varied habitats.

    Keywords:
    clonal reproductiondispersalmigrational meltdownspatial structure

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    Area of Science:

    • Evolutionary Biology
    • Population Genetics
    • Ecology

    Background:

    • Reproductive mode significantly influences population adaptation in heterogeneous environments.
    • Dispersal differences between sexual and clonal offspring can impact spatial adaptation.
    • Understanding mixed reproductive strategies is crucial for predicting species' success.

    Purpose of the Study:

    • To investigate how spatial structure affects adaptation in populations with mixed sexual and clonal reproduction.
    • To determine the role of clonal reproduction and parent-offspring association in adaptation.
    • To analyze the impact of differential dispersal of sexual and clonal offspring on adaptation.

    Main Methods:

    • Quantitative genetic deterministic modeling with stabilizing selection.
    • Stochastic individual-based simulations.
    • Analysis of source-sink dynamics and phenotypic optima.

    Main Results:

    • Increased clonal reproduction and parent-offspring association enhanced sink population adaptation.
    • Higher fractions of clonal dispersers improved adaptation when dispersal differed between reproductive modes.
    • Partially clonal reproduction mitigated negative effects of dispersal on habitat suitability.
    • Simulation results showed a reversed effect of differential dispersal on adaptation.

    Conclusions:

    • Mixed reproductive strategies, particularly partial clonality, facilitate adaptation in spatially complex and changing environments.
    • Clonal reproduction and specific dispersal strategies are key factors for successful invasion and persistence.
    • Findings offer insights into the ecological success of partially clonal organisms.