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Transcriptomic Mapping of Human Parotid Gland at Single-Cell Resolution
1State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China.
Journal of Dental Research
|February 28, 2022
Summary
This study presents the first single-cell transcriptomic atlas of the human parotid gland, revealing its cell types and functions. It also identifies key genes linked to Sjögren syndrome, offering insights into disease mechanisms.
Area of Science:
- Oral Biology
- Genomics
- Immunology
Background:
- The parotid gland, the largest salivary gland, is crucial for digestion and lubrication.
- Dysfunctional parotid glands can cause dental caries and oral inflammation.
- Single-cell RNA sequencing (scRNA-seq) offers high-resolution cellular analysis, but human parotid gland data was previously unavailable.
Purpose of the Study:
- To create the first cell atlas of the human parotid gland at single-cell resolution.
- To characterize the functional roles of parotid gland cell populations.
- To investigate the genetic underpinnings of Sjögren syndrome in the parotid gland.
Main Methods:
- Utilized 10× Genomics platform for single-cell RNA sequencing (scRNA-seq) of the human parotid gland.
- Performed characteristic gene analysis to identify cell functions.
- Integrated genome-wide association studies (GWAS) and bulk RNA-seq data with scRNA-seq results.
Main Results:
- Established a comprehensive cell atlas of the human parotid gland.
- Identified serous acinar cells responsible for secreting digestive enzymes and antibacterial proteins.
- Revealed cell-specific expression of Sjögren syndrome hub genes, implicating immune cell dysfunction.
Conclusions:
- The human parotid gland cell atlas provides a foundational resource for understanding salivary gland biology.
- Comparative analyses highlight the unique and shared features of the parotid gland with other digestive glands.
- Findings underscore the critical role of immune cell dysfunction in the pathogenesis of parotid Sjögren syndrome.
