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Metagenomic Deep Sequencing for Orbital Inflammatory Disease
M Reza Vagefi1, Oluwatobi O Idowu1, Amanda Miller1
1Division of Oculofacial Plastic Surgery, Department of Ophthalmology, University of California San Francisco, San Francisco, California, USA.
Ocular Immunology and Inflammation
|April 17, 2023
Summary
Metagenomic deep sequencing identified unique gene expression patterns in orbital inflammatory disease (OID). This approach can differentiate subtypes like idiopathic dacryoadenitis and IgG4-related disease (IgG4-RD), improving understanding of OID.
Area of Science:
- Ophthalmology
- Immunology
- Genomics
Background:
- Orbital inflammatory disease (OID) encompasses diverse immunologic conditions with often unclear causes.
- Standard investigations frequently fail to identify specific etiologies in OID.
Purpose of the Study:
- To apply metagenomic deep sequencing (MDS) for analyzing host gene expression in two OID subtypes.
- To investigate potential transcriptome signatures differentiating idiopathic dacryoadenitis and IgG4-related disease (IgG4-RD).
Main Methods:
- Lacrimal gland tissues from OID patients were prospectively collected.
- Metagenomic deep sequencing (MDS) was performed on tissue samples.
- Differential gene expression analysis compared idiopathic dacryoadenitis and IgG4-related disease (IgG4-RD).
Main Results:
- Twelve genes showed differential expression between idiopathic dacryoadenitis and IgG4-RD.
- Distinct gene expression patterns related to innate humoral immunity were observed.
- Several other genes were found to be upregulated in idiopathic dacryoadenitis.
Conclusions:
- A unique transcriptome signature distinguishes idiopathic dacryoadenitis from IgG4-RD.
- MDS is effective in identifying differentially expressed genes within OID subtypes.
- This method offers insights into host gene expression and inflammatory pathways in OID.
