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Mouse aggrecan, a large cartilage proteoglycan: protein sequence, gene structure and promoter sequence
H Watanabe1, L Gao, S Sugiyama
1Laboratory of Developmental Biology, National Institute of Dental Research, National Institutes of Health, Bethesda, MD 20892, USA.
The Biochemical Journal
|June 1, 1995
Summary
Researchers sequenced the mouse aggrecan gene, revealing its 18-exon structure and a strong correlation between gene domains and exons. This provides insights into cartilage gene expression and aggrecan
Area of Science:
- Genomics
- Molecular Biology
- Biochemistry
Background:
- Aggrecan is a major proteoglycan in cartilage.
- Understanding aggrecan gene structure is crucial for cartilage biology.
Purpose of the Study:
- To isolate and characterize the mouse aggrecan core protein gene.
- To analyze the gene's structure, including exons, introns, and flanking sequences.
- To investigate potential regulatory elements in the promoter region.
Main Methods:
- Genomic cloning and DNA sequencing.
- Exon and intron boundary mapping.
- Primer extension analysis.
- Bioinformatic analysis of promoter sequences.
Main Results:
- Isolated seven genomic clones of mouse aggrecan, spanning at least 61 kb with 18 exons.
- Identified a strong correlation between structural domains and exons, with the chondroitin sulfate domain encoded by a single exon.
- Discovered four transcription start sites and a promoter region with high GC content and binding motifs for transcription factors.
- Found sequence similarities between mouse aggrecan and human versican and rat neurocan.
Conclusions:
- The mouse aggrecan gene structure is highly conserved and organized.
- The identified promoter elements suggest potential regulation of cartilage gene expression.
- Comparative analysis highlights evolutionary relationships between aggrecan family members.