The rat peptidylarginine deiminase-encoding gene: structural analysis and the 5'-flanking sequence

Area of Science:

• Molecular Biology
• Genetics
• Biochemistry

Background:

• The peptidylarginine deiminase (PAD) gene plays a crucial role in various biological processes.
• Understanding the genomic organization and regulatory mechanisms of the PAD gene is essential for elucidating its function.
• Previous studies have not fully characterized the structure and regulatory elements of the rat PAD gene.

Purpose of the Study:

• To isolate and analyze genomic clones of the rat PAD-encoding gene.
• To determine the gene organization, including exon-intron structure and flanking regions.
• To identify potential regulatory elements in the 5'-flanking region that may influence gene expression.

Main Methods:

• Isolation of rat PAD genomic clones.
• Restriction mapping and nucleotide sequencing for gene organization analysis.
• S1 nuclease mapping to identify transcription start sites (cap sites).
• Bioinformatic analysis to identify potential transcription factor binding sites in the 5'-flanking region.

Main Results:

• The rat PAD gene spans over 50 kb, comprising 16 exons and 15 introns.
• Intron lengths vary significantly, ranging from 0.5 kb to over 16.5 kb.
• Two putative transcription start sites were identified 79 and 81 bp upstream of the translation start site.
• The 5'-flanking region contains potential binding sites for SP1 and Pit-1/GHF-1, as well as sequences homologous to growth hormone gene promoters and an estrogen-responsive element.
• Notably, typical TATAA or CCAAT boxes were absent in the promoter region.

Conclusions:

• The detailed genomic structure of the rat PAD gene has been elucidated.
• The identified regulatory elements in the 5'-flanking region suggest complex transcriptional control.
• These findings offer critical insights into the mechanisms underlying female-specific and sex cycle-dependent expression of the PAD gene.