Exons lost and found. Unusual evolution of a seminal vesicle transglutaminase substrate

James E. Hagstrom, Michael P. Fautsch, Monique Perdok, Anne Vrabel, Eric D. Wieben

Research output: Contribution to journalArticlepeer-review

21 Scopus citations


The GP1G gene codes for three of the four abundant androgen-regulated secretory proteins produced by the guinea pig seminal vesicle. Sequencing of the entire 6.3 kilobase gene and comparison with other mammalian seminal vesicle secretory protein genes reveals a common three-exon, two-intron organization. However, significant sequence similarity between this group of genes is largely limited to their 5'-flanking regions and first exons, which code almost exclusively for signal peptides in each case. The first intron of GP1G does contain a region with high similarity to the coding exon of a human seminal vesicle secretory protein gene, semenogelin II. The 3' half of the GP1G gene appears to share a common ancestry with the human SKALP/elafin gene. Sequences related to the elafin promoter, coding, untranslated regions, and introns are clearly identifiable within the GP1G sequence. The elafin gene codes for a serine protease inhibitor and is expressed in a variety of different human tissues. To determine if the GP1G gene was also active outside of the seminal vesicle, RNA from a variety of guinea pig tissues was hybridized to a GP1G cDNA probe. At least three novel RNA bands hybridizing to the GP1G probe were detected in testis RNA samples, and GP1G-related mRNAs were also found in other tissues. These data suggest that these seminal vesicle secretory proteins may have functional roles outside the reproductive system.

Original languageEnglish (US)
Pages (from-to)21114-21119
Number of pages6
JournalJournal of Biological Chemistry
Issue number35
StatePublished - 1996

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology


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