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Related Experiment Video

Updated: Jul 15, 2026

Characterization of Thymic Settling Progenitors in the Mouse Embryo Using In Vivo and In Vitro Assays
08:56

Characterization of Thymic Settling Progenitors in the Mouse Embryo Using In Vivo and In Vitro Assays

Published on: June 9, 2015

Severe defect in thymic development in an insertional mutant mouse model.

Erika Assarsson1, Benedict J Chambers, Kari Högstrand

  • 1Center for Infectious Medicine, Department of Medicine, Karolinska Institutet, Karolinska University Hospital, Stockholm, Sweden. erika@liai.org

Journal of Immunology (Baltimore, Md. : 1950)
|April 4, 2007
PubMed
Summary

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Transgenic mice (Tg66) exhibit thymic developmental defects due to a transgene insertion affecting thymic epithelial cells. This mouse model offers insights into thymic development and epithelial cell regulation.

Area of Science:

  • Immunology
  • Developmental Biology
  • Genetics

Background:

  • Transgenic mice expressing NK1.1 under the human CD2 promoter were generated.
  • Founder line Tg66 displayed an unexpected defect in thymic development.

Purpose of the Study:

  • To characterize the thymic developmental defect in Tg66 mice.
  • To investigate the underlying cause and potential implications for thymic development.

Main Methods:

  • Fluorescence in situ hybridization (FISH) for transgene insertion mapping.
  • Histological analysis of thymic architecture.
  • Flow cytometry for thymocyte and peripheral T cell populations.
  • Bone marrow reconstitution assays.

Main Results:

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Last Updated: Jul 15, 2026

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Characterization of Thymic Settling Progenitors in the Mouse Embryo Using In Vivo and In Vitro Assays

Published on: June 9, 2015

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  • Tg66 mice showed disorganized thymic architecture and reduced size, with preferential loss of cortical thymic epithelial cells.
  • Thymic cellularity decreased dramatically, leading to a block in early thymocyte differentiation (double-negative stage).
  • Reduced peripheral CD4(+) and CD8(+) T cells were observed; bone marrow reconstitution indicated a non-hematopoietic stromal cell defect.

Conclusions:

  • The Tg66 model presents a novel defect in thymic development, likely due to impaired non-hematopoietic stromal cells.
  • This model is valuable for studying genes regulating thymic epithelial cell differentiation and overall thymic function.
  • The phenotype appears semidominant, with homozygous mice showing a more severe defect.