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Development of Immunocompetence

Development of Immunocompetence

The initiation of cell-mediated immunity can be observed as early as the third month of fetal growth, with active antibody-mediated immunity following approximately one month later.
The initial cells that migrate from the fetal thymus settle within the skin and epithelial tissues lining the mouth, digestive tract, and in females, the uterus and vagina. These cells, including skin-based dendritic cells, serve as antigen-presenting cells, playing a key role in T cell activation.
Subsequent T...

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Related Experiment Video

Updated: Oct 28, 2025

Author Spotlight: Advancing Thymic Epithelial Cells and T-Cell Research with Human Thymic Organoids

Author Spotlight: Advancing Thymic Epithelial Cells and T-Cell Research with Human Thymic Organoids

Published on: October 4, 2024

Integrative Single-Cell Transcriptomic Analysis of Human Fetal Thymocyte Development.

Yuchen Li^1,2,3, Weihong Zeng^1,2,3, Tong Li^1,2,3

¹International Peace Maternity and Child Health Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China.

Frontiers in Genetics

|July 19, 2021

Summary

Human fetal thymocyte development and T cell lineage decisions were mapped using single-cell analysis. This study reveals conserved candidates for T cell receptor selection and insights into autoimmune disease susceptibility genes.

Keywords:

T lymphopoiesis fetal thymus human and murine single-cell RNA-seq transcriptional dynamics

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Area of Science:

Immunology
Developmental Biology
Genetics

Background:

T lymphocyte differentiation initiates during the intrauterine stage, but human fetal thymocyte lineage decisions across gestational ages remain unclear.
Understanding early T cell development is crucial for insights into immune system self-tolerance and function.

Purpose of the Study:

To elucidate T cell lineage decisions in human fetal thymocytes at various gestational ages.
To identify conserved molecular candidates governing T cell receptor (TCR) lineage selection during fetal development.
To analyze the trajectory of early thymocyte commitment and its relationship with autoimmune disorders.

Main Methods:

Integrative single-cell analyses of thymocytes across different human gestational ages.
Comparative analysis of transcriptional dynamics with mouse thymocyte development data.
Integration of genome-wide association study (GWAS) data for autoimmune disorders.

Main Results:

Identification of conserved candidates essential for TCR lineage selection in human fetal thymocytes.
Characterization of the developmental trajectory of early thymocyte commitment.
Revealed conserved and species-specific transcriptional patterns in thymocyte proliferation, apoptosis, and selection.
Associated specific fetal thymocyte developmental stages with susceptibility genes for autoimmune disorders.

Conclusions:

This study provides a comprehensive integrative map of human fetal thymocyte development.
The findings offer a valuable reference for understanding T cell lymphopoiesis and its role in immune self-tolerance.
Highlights previously underappreciated aspects of early T cell development and its implications for autoimmune diseases.