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Human transcription factor Sp3: genomic structure, identification of a processed pseudogene, and transcript analysis
Kelly M Moran1, Robbert H J Crusio, Connie H Chan
1Department of Microbiology and Immunology, Georgetown University Medical Center, 3900 Reservoir Road, NW, Washington, DC 20057, USA.
Gene
|October 12, 2004
Summary
The Sp3 gene, a key human transcription factor, spans over 55 kb on Chromosome 2 and exhibits alternative splicing, leading to diverse transcripts. This genomic complexity helps explain Sp3
Area of Science:
- Genetics
- Molecular Biology
- Gene Regulation
Background:
- The human transcription factor Sp3 functions bifunctionally as both an activator and repressor.
- Previous studies on Sp3's diverse functions yielded contradictory evidence.
- Limited data existed on the genomic structure and transcript variants of the Sp3 gene's large isoform.
Purpose of the Study:
- To elucidate the genomic structure of the human Sp3 gene.
- To identify potential transcript variants and translation initiation sites.
- To understand the molecular basis for Sp3's bifunctional activity.
Main Methods:
- Bacterial artificial chromosome (BAC) sequencing
- Reverse transcription-polymerase chain reaction (RT-PCR)
- Genomic PCR
- Database mining
- Northern blot analysis
- Sequence analysis
Main Results:
- The Sp3 gene spans over 55 kb across seven exons on Chromosome 2, featuring a CpG island at its 5' end.
- A processed pseudogene, psiSp3, was identified on Chromosome 13.
- Northern blot analysis revealed three predominant Sp3 transcripts (4.0, 6.0, and 2.5 kb).
- Alternative splicing of exon 3 generates multiple Sp3 transcripts, each with 3-5 potential translation initiation sites.
Conclusions:
- The complex genomic structure and alternative splicing of the Sp3 gene contribute to its diverse transcript profile.
- This molecular diversity is likely crucial for understanding Sp3's bifunctional regulatory roles in gene expression.