Cotranscription and intergenic splicing of human P2Y11 and SSF1 genes.
The P2Y(11) receptor is an ATP receptor positively coupled to the cAMP and phosphoinositide pathways. Ssf1 is a Saccharomyces cerevisiae nuclear protein, which plays an important role in mating. The gene encoding the human orthologue of SSF1 is adjacent to the P2Y(11) gene on chromosome 19. During the screening of placenta cDNA libraries, we isolated a chimeric clone resulting from the intergenic splicing between the P2Y(11) and SSF1 genes. The fusion protein was stably expressed in CHO-K1 cells where it generated a cAMP response to ATP qualitatively indistinguishable from that of the P2Y(11) receptor. According to both Western blotting and cAMP response, the expression of the fusion protein in the transfected cells was clearly lower than that of the P2Y(11) receptor. Both P2Y(11) and SSF1 probes detected a 5.6-kb messenger RNA with a similar pattern of intensity in each of 11 human tissues. The ubiquitous presence of chimeric transcripts and their up-regulation during granulocytic differentiation indicate that the transgenic splicing between the P2Y(11) and the SSF1 genes is a common and regulated phenomenon. There are very few examples of intergenic splicing in mammalian cells, and this is the first case involving a G-protein-coupled receptor.
Institute of Interdisciplinary Research, School of Medicine, Université Libre de Bruxelles, 808 Route de Lennik, 1070 Brussels, Belgium.
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Boeynaems
D000227:Adenine Nucleotides / Q000494:pharmacology; D017398:Alternative Splicing; D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D016466:CHO Cells; D002454:Cell Differentiation / Q000187:drug effects; D002874:Chromosome Mapping; D002888:Chromosomes, Human, Pair 19; D006224:Cricetinae; D000242:Cyclic AMP / Q000378:metabolism; D005091:Exons; D015723:Gene Library; D018922:HL-60 Cells; D006801:Humans; D007438:Introns; D008969:Molecular Sequence Data; D009687:Nuclear Proteins / Q000235:genetics* / Q000502:physiology; D009928:Organ Specificity; D012333:RNA, Messenger / Q000235:genetics; D018048:Receptors, Purinergic P2 / Q000235:genetics* / Q000502:physiology; D011993:Recombinant Fusion Proteins / Q000096:biosynthesis / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D014158:Transcription, Genetic; D014162:Transfection; D014212:Tretinoin / Q000494:pharmacology
D000227:Adenine Nucleotides; D009687:Nuclear Proteins; C109734:P2RY11 protein, human; C491917:PPAN protein, human; D012333:RNA, Messenger; D018048:Receptors, Purinergic P2; D011993:Recombinant Fusion Proteins; D014212:Tretinoin; D000242:Cyclic AMP