A splice form of polycystin-2, lacking exon 7, does not interact with polycystin-1

Karl Hackmann, Arseni Markoff, Feng Qian, Nadia Bogdanova, Gregory G. Germino, Petra Pennekamp, Bernd Dworniczak, Jürgen Horst, Volker Gerke

Research output: Contribution to journalArticle

Abstract

Polycystin-2 (or polycystic kidney disease gene 2 product, PKD2) and its homologues are calcium-regulated ion channels. Mutations in PKD2 are causative for autosomal dominant polycystic kidney disease. Alternative splicing has been documented for the 'PKD2-like' genes as a naturally occurring event and for PKD2 in pathologic context. Here we studied naturally occurring PKD2/Pkd2 (human/murine) splice forms on the mRNA and protein levels. Systematic scanning of PKD2/Pkd2 cDNAs obtained through RT-PCR from murine tissues and human cell lines revealed alternative splice forms that were sequenced and checked for translation. We identified three major alternative transcripts of PKD2/Pkd2, PKD2/Pkd2Δ6, PKD2/Pkd2Δ7 and PKD2/Pkd2Δ9, and one minor splice form, PKD2/Pkd2Δ12-13, numbered according to deleted exons or parts thereof. A transcript lacking exon 7 (PKD2/ Pkd2Δ7) generated significantly altered protein variant. This polycystin-2Δ7 protein appeared stable, when expressed in cell culture and apparently did not interact with polycyctin-1, which should be due to the reversed topology (extracellular) of the interacting C-terminus (intracellular in polycystin-2). Pkd2Δ7 transcript was predominantly expressed in brain and amounted to 3-6.4% of Pkd2 transcripts in the relevant organ. Moreover, both Pkd2 and Pkd2Δ7 were developmentally regulated. Polycystin-2Δ7 adds on to the number of identified polycystin molecules. The predominant expression in brain indicates a function in this organ. The inability to interact with polycystin-1 expands further the PKD1-independent functions of polycystin-2 forms.

Original languageEnglish (US)
Pages (from-to)3249-3262
Number of pages14
JournalHuman Molecular Genetics
Volume14
Issue number21
DOIs
StatePublished - Nov 2005

ASJC Scopus subject areas

  • Genetics

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    Hackmann, K., Markoff, A., Qian, F., Bogdanova, N., Germino, G. G., Pennekamp, P., Dworniczak, B., Horst, J., & Gerke, V. (2005). A splice form of polycystin-2, lacking exon 7, does not interact with polycystin-1. Human Molecular Genetics, 14(21), 3249-3262. https://doi.org/10.1093/hmg/ddi356