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Molecular analysis of rat dentin sialoprotein
H H Ritchie1, G J Pinero, H Hou
1University of Texas Houston, Health Science Center, Department of Basic Sciences 77030, USA.
Connective Tissue Research
|January 1, 1995
Summary
Dentin sialoprotein (DSP) is crucial for dentinogenesis. Researchers found that multiple DSP mRNA transcripts likely originate from two related DSP genes in the rat genome, impacting tooth development.
Area of Science:
- Biochemistry
- Molecular Biology
- Developmental Biology
Background:
- Dentin sialoprotein (DSP) is a key noncollagenous protein in dentin, synthesized by odontoblasts during dentinogenesis.
- Understanding DSP's genetic origin is vital for comprehending its role in tooth development.
Purpose of the Study:
- To investigate the origin of multiple dentin sialoprotein (DSP) mRNA transcripts.
- To determine if multiple DSP genes exist in the rat genome.
Main Methods:
- Isolation of full-length DSP cDNA from a rat odontoblast/dental pulp library.
- In situ hybridization to detect DSP mRNA expression in newborn rat jaws.
- Northern analysis of rat tissues to identify DSP transcripts.
- Isolation and analysis of rat genomic clones using EcoRI digestion and Southern analysis.
Main Results:
- DSP mRNA was exclusively expressed by odontoblasts in newborn rat jaws.
- Northern analysis revealed multiple DSP transcripts (4.6 kb and 1.5 kb) in tooth germs and incisors.
- Genomic Southern analysis indicated the presence of DSP cDNA hybridization to different EcoRI fragments (4 kb and 6 kb) from distinct genomic clones.
- These findings suggest the existence of at least two related DSP genes in the rat genome.
Conclusions:
- The multiple DSP mRNA transcripts observed are likely derived from two related DSP genes coexisting in the rat genome.
- This genetic complexity may contribute to the intricate process of dentinogenesis.