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The mouse APLP2 gene. Chromosomal localization and promoter characterization
C S von Koch1, D K Lahiri, A L Mammen
1Department of Neuroscience, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205-2196, USA.
The Journal of Biological Chemistry
|October 27, 1995
Summary
The mouse amyloid precursor-like protein 2 (APLP2) gene promoter, crucial for senile plaque components, lacks a TATA box and exhibits housekeeping gene characteristics. A minimal promoter region directs high gene expression.
Area of Science:
- Molecular biology
- Genetics
- Neuroscience
Background:
- Senile plaques, implicated in neurodegenerative diseases, contain amyloid precursor-like proteins (APLP1, APLP2).
- Understanding the genetic regulation of APLP2 is vital for studying its role in plaque formation.
Purpose of the Study:
- To characterize the promoter region of the mouse amyloid precursor-like protein 2 (APLP2) gene.
- To identify regulatory elements responsible for APLP2 gene expression.
Main Methods:
- Interspecific mouse backcross mapping to localize the APLP2 gene.
- Cloning and characterization of the APLP2 gene promoter.
- Reporter gene assays (chloramphenicol acetyl transferase) with progressive 5'-deletions in transfected cells (N2a, Ltk-).
Main Results:
- The mouse APLP2 gene was mapped to chromosome 9, syntenic with human 11q.
- The APLP2 promoter is GC-rich, lacks a TATA box, and possesses multiple transcription start sites, characteristic of housekeeping genes.
- A minimal promoter region of 99 bp upstream of the main transcription start site was sufficient for high reporter gene expression.
Conclusions:
- The APLP2 promoter shares features with housekeeping gene promoters.
- A small, core region of the APLP2 promoter is sufficient for robust gene expression, providing insights into APLP2 regulation.