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The mouse prosaposin locus: promoter organization
1Division of Human Genetics, Children's Hospital Research Foundation at Children's Hospital Medical Center, Cincinnati, OH 45229-3039, USA.
DNA and Cell Biology
|January 1, 1997
Summary
Researchers characterized the 5' region of the prosaposin gene, identifying regulatory elements crucial for its expression. This study enhances understanding of prosaposin gene regulation and its role in lysosomal function.
Area of Science:
- Molecular Biology
- Genetics
- Biochemistry
Background:
- Prosaposin is a multifunctional protein with neurotrophic and glycosphingolipid hydrolase activator roles.
- Prosaposin gene expression is regulated at multiple levels, but its 5' region remained uncharacterized.
Purpose of the Study:
- To characterize the 5'-flanking region, first intron, and first exon of the murine prosaposin gene.
- To identify regulatory elements controlling prosaposin gene transcription.
Main Methods:
- Rapid Amplification of cDNA Ends (RACE), S1 nuclease protection, and sequence analysis were employed.
- Luciferase reporter gene assays were performed in various cell lines (NS20Y, NIH-3T3, SF-7).
- Deletion constructs of the 5' promoter region were analyzed.
Main Results:
- The first intron is ~15 kb, and the complete gene is ~25 kb.
- Transcriptional initiation sites were mapped 87 and 94 bp upstream of the ATG in exon 1.
- Positive and negative regulatory elements were identified within 2,400 bp upstream of the transcription start site, including a negative element between 742 and 310 bp.
Conclusions:
- The 5'-flanking region of the prosaposin gene contains critical regulatory elements.
- These findings provide insights into the transcriptional regulation of the prosaposin locus.