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Updated: Dec 25, 2025

In Silico Identification and Characterization of circRNAs During Host-Pathogen Interactions
Published on: October 21, 2022
Circad: a comprehensive manually curated resource of circular RNA associated with diseases
Mercy Rophina1, Disha Sharma1,2, Mukta Poojary1,2
1Genome Informatics Department, CSIR-Institute of Genomics and Integrative Biology, Mathura Road, District-South Delhi, New Delhi-110025, India.
Insights
Circular RNAs (circRNAs) are key disease biomarkers. A new database, CircAD, offers over 1300 circRNAs linked to 150 diseases, aiding biomarker research and functional studies.
Area of Science:
- Molecular Biology
- Genomics
- Biochemistry
Background:
- Circular RNAs (circRNAs) are novel RNA isoforms formed by back-splicing.
- circRNAs are expressed across species and play roles in various diseases.
- Emerging evidence highlights circRNAs as potential disease biomarkers.
Purpose of the Study:
- To create a comprehensive, manually curated database of disease-associated circRNAs.
- To provide researchers with a valuable resource for studying circRNAs in disease.
- To facilitate the use of circRNAs as biomarkers and for functional investigations.
Main Methods:
- Manual curation of scientific literature for disease-associated circRNAs.
- Database development integrating circRNA information with disease classifications (ICD codes).
- Inclusion of primer details, assay information, and statistical data for selected circRNAs.
Main Results:
- The CircAD database contains over 1300 circRNAs linked to 150 diseases.
- circRNAs are mapped to 113 International Statistical Classification of Diseases (ICD) codes.
- The database provides primer sequences, assay details, fold changes, and statistical significance.
Conclusions:
- CircAD is a unique and comprehensive resource for disease-associated circRNAs.
- The database supports research into circRNAs as biomarkers and for functional studies.
- CircAD offers ready-to-use primer information for experimental applications.
Abstract:
Circular RNAs (circRNAs) are unique transcript isoforms characterized by back splicing of exon ends to form a covalently closed loop or circular conformation. These transcript isoforms are now known to be expressed in a variety of organisms across the kingdoms of life. Recent studies have shown the role of circRNAs in a number of diseases and increasing evidence points to their potential application as biomarkers in these diseases. We have created a comprehensive manually curated database of circular RNAs associated with diseases. This database is available at URL http://clingen.igib.res.in/circad/. The Database lists more than 1300 circRNAs associated with 150 diseases and mapping to 113 International Statistical Classification of Diseases (ICD) codes with evidence of association linked to published literature. The database is unique in many ways. Firstly, it provides ready-to-use primers to work with, in order to use circRNAs as biomarkers or to perform functional studies. It additionally lists the assay and PCR primer details including experimentally validated ones as a ready reference to researchers along with fold change and statistical significance. It also provides standard disease nomenclature as per the ICD codes. To the best of our knowledge, circad is the most comprehensive and updated database of disease associated circular RNAs.
Abstract:
Availability: http://clingen.igib.res.in/circad/.
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