title: Primary gene structure and expression studies of rodent paracellin-1.
abstract: The novel member of the claudin multigene family, paracellin-1/claudin-16, encoded by the gene PCLN1, is a renal tight junction protein that is involved in the paracellular transport of magnesium and calcium in the thick ascending limb of Henle's loop. Mutations in human PCLN1 are associated with familial hypomagnesemia with hypercalciuria and nephrocalcinosis, an autosomal recessive disease that is characterized by severe renal magnesium and calcium loss. The complete coding sequences of mouse and rat Pcln1 and the murine genomic structure are here presented. Full-length cDNAs are 939 and 1514 bp in length in mouse and rat, respectively, encoding a putative open-reading frame of 235 amino acids in both species with 99% identity. Exon-intron analysis of the human and mouse genes revealed a 100% homology of coding exon lengths and splice-site loci. By radiation hybrid mapping, the murine Pcln1 gene was assigned directly to marker D16Mit133 on mouse chromosome 16 (syntenic to a locus on human chromosome 3q27, which harbors the human PCLN1 gene). Mouse multiple-tissue Northern blot showed Pcln1 expression exclusively in the kidney. The expression profile along the nephron was analyzed by reverse transcriptase-PCR on microdissected nephron segments and immunohistochemistry of rat kidney. Paracellin-1 expression was restricted to distal tubular segments including the thick ascending limb of Henle's loop, the distal tubule, and the collecting duct. The identification and characterization of the rodent Pcln1 genes provide the basis for further studies of paracellin-1 function in suitable animal models.
authors.affiliation: *Department of Pediatrics, Philipps University, Marburg, Germany; Department of Cell Biology, Institute of Anatomy, University of Aarhus, Aarhus, Denmark; Institute of Human Genetics, Philipps University, Marburg, Germany; Deutsches Krebsforschungszentrum, Heidelberg, Germany.
authors.forename: Stefanie
authors.initials: S
authors.lastname: Weber
authors.affiliation: *Department of Pediatrics, Philipps University, Marburg, Germany; Department of Cell Biology, Institute of Anatomy, University of Aarhus, Aarhus, Denmark; Institute of Human Genetics, Philipps University, Marburg, Germany; Deutsches Krebsforschungszentrum, Heidelberg, Germany.
authors.forename: Karl P
authors.initials: KP
authors.lastname: Schlingmann
authors.affiliation: *Department of Pediatrics, Philipps University, Marburg, Germany; Department of Cell Biology, Institute of Anatomy, University of Aarhus, Aarhus, Denmark; Institute of Human Genetics, Philipps University, Marburg, Germany; Deutsches Krebsforschungszentrum, Heidelberg, Germany.
authors.forename: Melanie
authors.initials: M
authors.lastname: Peters
authors.affiliation: *Department of Pediatrics, Philipps University, Marburg, Germany; Department of Cell Biology, Institute of Anatomy, University of Aarhus, Aarhus, Denmark; Institute of Human Genetics, Philipps University, Marburg, Germany; Deutsches Krebsforschungszentrum, Heidelberg, Germany.
authors.forename: Lene Niemann
authors.initials: LN
authors.lastname: Nejsum
authors.affiliation: *Department of Pediatrics, Philipps University, Marburg, Germany; Department of Cell Biology, Institute of Anatomy, University of Aarhus, Aarhus, Denmark; Institute of Human Genetics, Philipps University, Marburg, Germany; Deutsches Krebsforschungszentrum, Heidelberg, Germany.
authors.forename: Søren
authors.initials: S
authors.lastname: Nielsen
authors.affiliation: *Department of Pediatrics, Philipps University, Marburg, Germany; Department of Cell Biology, Institute of Anatomy, University of Aarhus, Aarhus, Denmark; Institute of Human Genetics, Philipps University, Marburg, Germany; Deutsches Krebsforschungszentrum, Heidelberg, Germany.
authors.forename: Hartmut
authors.initials: H
authors.lastname: Engel
authors.affiliation: *Department of Pediatrics, Philipps University, Marburg, Germany; Department of Cell Biology, Institute of Anatomy, University of Aarhus, Aarhus, Denmark; Institute of Human Genetics, Philipps University, Marburg, Germany; Deutsches Krebsforschungszentrum, Heidelberg, Germany.
authors.forename: Karl-Heinz
authors.initials: KH
authors.lastname: Grzeschik
authors.affiliation: *Department of Pediatrics, Philipps University, Marburg, Germany; Department of Cell Biology, Institute of Anatomy, University of Aarhus, Aarhus, Denmark; Institute of Human Genetics, Philipps University, Marburg, Germany; Deutsches Krebsforschungszentrum, Heidelberg, Germany.
authors.forename: Hannsjörg W
authors.initials: HW
authors.lastname: Seyberth
authors.affiliation: *Department of Pediatrics, Philipps University, Marburg, Germany; Department of Cell Biology, Institute of Anatomy, University of Aarhus, Aarhus, Denmark; Institute of Human Genetics, Philipps University, Marburg, Germany; Deutsches Krebsforschungszentrum, Heidelberg, Germany.
authors.forename: Hermann-Joseph
authors.initials: HJ
authors.lastname: Gröne
authors.affiliation: *Department of Pediatrics, Philipps University, Marburg, Germany; Department of Cell Biology, Institute of Anatomy, University of Aarhus, Aarhus, Denmark; Institute of Human Genetics, Philipps University, Marburg, Germany; Deutsches Krebsforschungszentrum, Heidelberg, Germany.
authors.forename: Rolf
authors.initials: R
authors.lastname: Nüsing
authors.affiliation: *Department of Pediatrics, Philipps University, Marburg, Germany; Department of Cell Biology, Institute of Anatomy, University of Aarhus, Aarhus, Denmark; Institute of Human Genetics, Philipps University, Marburg, Germany; Deutsches Krebsforschungszentrum, Heidelberg, Germany.
authors.forename: Martin
authors.initials: M
authors.lastname: Konrad
mesh_terms: D000595:Amino Acid Sequence / Q000235:genetics; D000818:Animals; D001483:Base Sequence / Q000235:genetics; D015152:Blotting, Northern; D002417:Cattle; D002874:Chromosome Mapping; D057167:Claudins; D004591:Electrophoresis, Polyacrylamide Gel; D008040:Genetic Linkage; D006801:Humans; D007668:Kidney / Q000378:metabolism; D008565:Membrane Proteins / Q000235:genetics* / Q000378:metabolism; D051379:Mice; D008969:Molecular Sequence Data; D051381:Rats; D020133:Reverse Transcriptase Polymerase Chain Reaction; D017385:Sequence Homology; D026801:Synteny; D014018:Tissue Distribution
chemical_list: D057167:Claudins; D008565:Membrane Proteins; C502010:claudin 16