The human polycystic kidney disease 2-like (PKDL) gene: exon/intron structure and evidence for a novel splicing mechanism.
Polycystin-L is a member of the expanding family of polycystins. Mutations in polycystin-1 or -2 cause human autosomal dominant polycystic kidney disease (ADPKD). The mouse ortholog of PKDL, Pkdl, is deleted in a mouse line with renal and retinal defects. We recently have shown that polycystin-L has calcium channel properties. In the current study, we determined the exon/intron organization of the PKDL gene and its alternative splicing. We show that PKDL has 16 exons. All splice acceptor/donor sites for these exons conform to the GT-AG rule. The positions of introns and the sizes of exons in the PKDL gene are very similar to those of PKD2, except for the last two 3' end exons. RT-PCR demonstrates the existence of at least three polycystin-L splice variants: PKDL(Delta5), PKDL(Delta456), and PKDL(Delta15) that are expressed in a tissue-specific manner. In addition, we have localized polymorphic marker D10S603 to intron 4 and exon 5 of PKDL. Elucidation of the gene structure, exact location, and alternative splicing patterns of PKDL will facilitate its evaluation as a candidate gene in cystic or other genetic disorders.
Guo
L
L
Renal Division, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts 02115, USA.
Chen
M
M
Basora
N
N
Zhou
J
J
D017398:Alternative Splicing / Q000235:genetics*; D000595:Amino Acid Sequence; D001483:Base Sequence; D015220:Calcium Channels; D004247:DNA / Q000737:chemistry; D017931:DNA Primers / Q000737:chemistry; D004587:Electrophoresis, Agar Gel; D005091:Exons / Q000235:genetics*; D006801:Humans; D007438:Introns / Q000235:genetics*; D008562:Membrane Glycoproteins / Q000737:chemistry / Q000235:genetics*; D008969:Molecular Sequence Data; D010750:Phosphoproteins / Q000737:chemistry / Q000235:genetics*; D016891:Polycystic Kidney, Autosomal Dominant / Q000235:genetics*; D011956:Receptors, Cell Surface; D020133:Reverse Transcriptase Polymerase Chain Reaction; D017422:Sequence Analysis, DNA
D015220:Calcium Channels; D017931:DNA Primers; D008562:Membrane Glycoproteins; C117185:PKD2L1 protein, human; D010750:Phosphoproteins; C486487:Pkd2l1 protein, mouse; D011956:Receptors, Cell Surface; D004247:DNA