Molecular cloning and characterization of a novel mouse betaPix isoform.
BetaPix, a Pak-interacting guanine nucleotide exchange factor is known to be involved in the regulation of Cdc42/Rac GTPases and Pak kinase activity. Currently, three 1Pix isoforms, betaPix-a, -b, and -c have been reported. In this study, the cDNA of a novel Pix splice variant was isolated from a mouse brain cDNA library. The cloned betaPix isoform, named betaPix-d, lacks leucine zipper domain that is present in other Pix isoforms, and has a 11 amino acid addition at carboxyl terminus and distinct 3'-UTR Analysis of the tissue distribution of betaPix-d using RT-PCR revealed that its message was present mainly in brain and testis but in lower levels in heart, spleen, lung, liver, skeletal muscle and kidney. In situ hybridization studies with the 13Pix-d specific probes in the rat embryo show that betaPix-d isoform is expressed mainly in the central nervous system. Moreover, temporal expression pattern of the isoform is correlated with the active neurogenesis period in the cerebral cortex and cerebellum during rat brain development. These findings suggest that betaPix-d isoform may be developmentally regulated.
Kim
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T
School of Biological Sciences, College of Natural Sciences, Seoul National University, Korea.
Park
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D
D017398:Alternative Splicing; D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D018797:Cell Cycle Proteins / Q000235:genetics*; D002531:Cerebellum / Q000196:embryology / Q000201:enzymology*; D002540:Cerebral Cortex / Q000196:embryology / Q000201:enzymology*; D003001:Cloning, Molecular; D018076:DNA, Complementary; D018507:Gene Expression Regulation, Developmental; D015971:Gene Expression Regulation, Enzymologic; D020662:Guanine Nucleotide Exchange Factors / Q000235:genetics*; D017403:In Situ Hybridization; D007527:Isoenzymes / Q000235:genetics*; D008297:Male; D051379:Mice; D008813:Mice, Inbred ICR; D008969:Molecular Sequence Data; D017346:Protein Serine-Threonine Kinases / Q000235:genetics; D051057:Proto-Oncogene Proteins c-akt; D012333:RNA, Messenger / Q000032:analysis; D064067:Rho Guanine Nucleotide Exchange Factors; D015398:Signal Transduction; D014158:Transcription, Genetic; D020764:cdc42 GTP-Binding Protein / Q000235:genetics; D054462:p21-Activated Kinases
C576607:Arhgef7 protein, mouse; D018797:Cell Cycle Proteins; D018076:DNA, Complementary; D020662:Guanine Nucleotide Exchange Factors; D007527:Isoenzymes; D012333:RNA, Messenger; D064067:Rho Guanine Nucleotide Exchange Factors; D017346:Protein Serine-Threonine Kinases; D051057:Proto-Oncogene Proteins c-akt; D054462:p21-Activated Kinases; D020764:cdc42 GTP-Binding Protein