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A single-cell atlas revealing cellular heterogeneity across healthy and diseased human thymus
Martin Direder1,2,3, Matthias Wielscher4, Melanie Salek4
1Laboratory for Cardiac and Thoracic Diagnosis, Regeneration and Applied Immunology, Department of Thoracic Surgery, Medical University of Vienna, Vienna, Austria.
Insights
This study maps the human thymus using single-cell sequencing, revealing new cell types and communication in development and disease. Findings offer insights into thymic hyperplasia and tumors for future diagnostics.
Area of Science:
- Immunology
- Developmental Biology
- Genomics
Background:
- The thymus is crucial for adaptive immunity, but its development and diseases like thymic hyperplasia and tumors remain incompletely understood.
- Previous research has been limited in scope, lacking high-resolution cellular and molecular detail across developmental stages and pathologies.
Purpose of the Study:
- To create a comprehensive single-cell atlas of the human thymus across development and disease states.
- To identify novel cell populations, transcriptional programs, and intercellular communication networks within the thymus.
- To uncover molecular alterations associated with thymic pathologies for potential diagnostic and therapeutic applications.
Main Methods:
- Conducted a large-scale single-cell RNA sequencing (scRNA-seq) analysis of 453,727 cells from 53 diverse datasets.
- Included healthy prenatal, pediatric, and adult thymic tissues, alongside six pathological conditions (thymic hyperplasia, thymic epithelial tumors).
- Integrated scRNA-seq data with bulk RNA-seq datasets to validate and enhance translational relevance.
Main Results:
- Generated a high-resolution cellular atlas of the human thymus.
- Identified disease-specific cellular populations and transcriptional programs, particularly in fibroblast and epithelial cell subsets.
- Uncovered distinct intercellular communication patterns and transcriptional alterations linked to thymic pathology.
Conclusions:
- This study provides a foundational resource for understanding thymic development and disease at a single-cell level.
- The identified cellular and molecular landscape offers new avenues for diagnostic and therapeutic innovations in thymic disorders.
- The atlas serves as a critical reference for future research into thymus biology and related pathologies.
Abstract:
The human thymus plays a key role in the development of the adaptive immune system. Its development and pathologic aberrations with missing involution occupy the scientific world for years. Here, we present a comprehensive single-cell RNA sequencing (scRNA-seq) analysis of 453,727 cells across 53 datasets derived from healthy prenatal, pediatric, and adult thymic tissues, as well as six pathological conditions, including thymic hyperplasia and thymic epithelial tumors (types A, AB, B, C, and micronodular thymoma). We created a high-resolution cellular atlas revealing disease-specific cellular populations and transcriptional programs, particularly within fibroblast subsets and thymic epithelial cells. Comparative analysis uncovers distinct intercellular communication patterns and identifies transcriptional alterations associated with thymic pathology. Integration with published bulk RNA-seq datasets supports the robustness and translational relevance of our findings. This study provides a foundational resource for understanding the cellular and molecular landscape of thymic development and disease, offering avenues for diagnostic and therapeutic innovations.
