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Genomic organization of human DLG4, the gene encoding postsynaptic density 95
D G Stathakis1, N Udar, O Sandgren
1Department of Medicine, University of California, Irvine 92697-2275, USA.
Journal of Neurochemistry
|December 3, 1999
Summary
The DLG4 gene has 22 exons and a TATA-less promoter. Despite mapping to a cone dystrophy locus, DLG4 mutations were not found in affected patients, ruling it out as the cause.
Area of Science:
- Genetics
- Molecular Biology
- Neuroscience
Background:
- The DLG4 gene encodes a key postsynaptic density protein.
- Understanding DLG4's structure and regulation is crucial for neurological research.
- Cone dystrophy is a group of inherited retinal diseases.
Purpose of the Study:
- To determine the exon-intron organization and promoter region of the DLG4 gene.
- To investigate the role of DLG4 in autosomal dominant cone dystrophy 5.
Main Methods:
- Exon-intron mapping of the DLG4 locus.
- Analysis of the DLG4 5'-flanking promoter region.
- Mutation screening in cone dystrophy patients.
Main Results:
- DLG4 comprises 22 exons with specific splice site characteristics.
- Alternative splicing of DLG4 generates truncated PSD95 isoforms.
- A TATA-less promoter with a CpG island controls DLG4 expression.
- No causative mutations in DLG4 were identified in 15 cone dystrophy patients.
Conclusions:
- DLG4 exhibits complex exon-intron organization and alternative splicing.
- DLG4 is unlikely to be the causative gene for autosomal dominant cone dystrophy 5.