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Complete sequencing and characterization of equine aggrecan
E H G Caporali, T Kuykendall, M C Stewart1
1Matthew Stewart, VTH-UIUC, 1008W Hazelwood Drive, Urbana, IL 61802, United States, Phone: +1 217 265-5206, Fax: +1 217 244-1475,
Veterinary and Comparative Orthopaedics and Traumatology : V.C.O.T
|January 31, 2015
Summary
Researchers fully sequenced equine aggrecan, revealing conserved protein cleavage sites critical for understanding cartilage degradation. This complete equine aggrecan sequence aids research into musculoskeletal tissue health.
Area of Science:
- Molecular biology
- Genomics
- Biochemistry
Background:
- Aggrecan is a major proteoglycan in cartilage.
- Understanding aggrecan structure and processing is crucial for cartilage health.
Purpose of the Study:
- To fully sequence and characterize equine aggrecan.
- To confirm conserved cleavage sites for aggrecanases, calpains, and matrix metalloproteinases (MMPs).
Main Methods:
- Reverse transcription-polymerase chain reaction (RT-PCR) and rapid amplification of cDNA ends (RACE) were used.
- Clones were sequenced and compared with the equine genome database.
- Western blotting analyzed post-secretion processing.
Main Results:
- The equine aggrecan gene spans 61 kb on chromosome 1, encoded by 17 exons.
- Two major aggrecan variants were identified, with variations in the CS1 domain.
- Globular domains are highly conserved, but the equine CS1 domain is larger and less conserved.
- Conserved cleavage sites for aggrecanases, calpains, and MMPs were identified.
- Western blotting indicated complex post-secretion processing.
Conclusions:
- The complete equine aggrecan sequence provides a foundation for further research.
- This sequence will advance understanding of aggrecan processing and degradation in equine cartilage and musculoskeletal tissues.
