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1.
Leukemia ; 25(12): 1849-56, 2011 Dec.
Article in English | MEDLINE | ID: mdl-21738213

ABSTRACT

MicroRNA-125b-1 (miR-125b-1) is a target of a chromosomal translocation t(11;14)(q24;q32) recurrently found in human B-cell precursor acute lymphoblastic leukemia (BCP-ALL). This translocation results in overexpression of miR-125b controlled by immunoglobulin heavy chain gene (IGH) regulatory elements. In addition, we found that six out of twenty-one BCP-ALL patients without t(11;14)(q24;q32) showed overexpression of miR-125b. Interestingly, four out of nine patients with BCR/ABL-positive BCP-ALL and one patient with B-cell lymphoid crisis that had progressed from chronic myelogenous leukemia overexpressed miR-125b. To examine the role of the deregulated expression of miR-125b in the development of B-cell tumor in vivo, we generated transgenic mice mimicking the t(11;14)(q24;q32) (Eµ/miR-125b-TG mice). Eµ/miR-125b-TG mice overexpressed miR-125b driven by IGH enhancer and promoter and developed IgM-negative or IgM-positive lethal B-cell malignancies with clonal proliferation. B cells obtained from the Eµ/miR-125b-TG mice were resistant to apoptosis induced by serum starvation. We identified Trp53inp1, a pro-apoptotic gene induced by cell stress, as a novel target gene of miR-125b in hematopoietic cells in vitro and in vivo. Our results provide direct evidence that miR-125b has important roles in the tumorigenesis of precursor B cells.


Subject(s)
Immunoglobulin mu-Chains/genetics , MicroRNAs/physiology , Precursor B-Cell Lymphoblastic Leukemia-Lymphoma/genetics , Animals , Apoptosis , Base Sequence , Blotting, Southern , Chromosomes, Human, Pair 11/genetics , Chromosomes, Human, Pair 14/genetics , Flow Cytometry , Humans , Luciferases/metabolism , Mice , Mice, Inbred C57BL , Mice, Transgenic , Molecular Sequence Data , Precursor B-Cell Lymphoblastic Leukemia-Lymphoma/pathology , RNA, Messenger/genetics , Real-Time Polymerase Chain Reaction , Sequence Homology, Nucleic Acid , Translocation, Genetic/genetics
2.
Leukemia ; 22(9): 1728-36, 2008 Sep.
Article in English | MEDLINE | ID: mdl-18548093

ABSTRACT

Activation of the phosphatidylinositol-3 kinase/Akt/mammalian target of the rapamycin (PI3K/Akt/mTOR) pathway and inactivation of wild-type p53 by murine double minute 2 homologue (Mdm2) overexpression are frequent molecular events in acute myeloid leukemia (AML). We investigated the interaction of PI3K/Akt/mTOR and p53 pathways after their simultaneous blockade using the dual PI3K/mTOR inhibitor PI-103 and the Mdm2 inhibitor Nutlin-3. We found that PI-103, which itself has modest apoptogenic activity, acts synergistically with Nutlin-3 to induce apoptosis in a wild-type p53-dependent fashion. PI-103 synergized with Nutlin-3 to induce Bax conformational change and caspase-3 activation, despite its inhibitory effect on p53 induction. The PI-103/Nutlin-3 combination caused profound dephosphorylation of 4E-BP1 and decreased expression of many proteins including Mdm2, p21, Noxa, Bcl-2 and survivin, which can affect mitochondrial stability. We suggest that PI-103 actively enhances downstream p53 signaling and that a combination strategy aimed at inhibiting PI3K/Akt/mTOR signaling and activating p53 signaling is potentially effective in AML, where TP53 mutations are rare and downstream p53 signaling is intact.


Subject(s)
Apoptosis/drug effects , Leukemia, Myeloid, Acute/metabolism , Phosphoinositide-3 Kinase Inhibitors , Protein Kinases/drug effects , Proto-Oncogene Proteins c-mdm2/antagonists & inhibitors , Tumor Suppressor Protein p53/drug effects , Drug Synergism , Furans/pharmacology , Gene Expression Regulation/drug effects , Humans , Imidazoles/pharmacology , Leukemia, Myeloid, Acute/drug therapy , Leukemia, Myeloid, Acute/pathology , Mitochondrial Proteins/drug effects , Piperazines/pharmacology , Protein Kinase Inhibitors/pharmacology , Pyridines/pharmacology , Pyrimidines/pharmacology , TOR Serine-Threonine Kinases , Tumor Cells, Cultured , Tumor Suppressor Protein p53/genetics
3.
Mol Genet Genomics ; 270(6): 449-61, 2004 Jan.
Article in English | MEDLINE | ID: mdl-14655046

ABSTRACT

In interphase cells of fission yeast, the spindle pole body (SPB) is thought to be connected with chromosomal centromeres by an as yet unknown mechanism that spans the nuclear membrane. To elucidate this mechanism, we performed two-hybrid screens for proteins that interact with Kms1 and Sad1, which are constitutive membrane-bound components of the SPB that interact with each other. Seven and 26 genes were identified whose products potentially interact with Kms1 and Sad1, respectively. With the exception of Dlc1 (a homolog of the 14-kDa dynein light chain), all of the Kms1 interactors also interacted with Sad1. Among the genes identified were the previously known genes rhp9+ / crb2+, cut6+, ags1+ / mok1+, gst3+, kms2+, and sid4+. The products of kms2+ and sid4+ localize to the SPB. The novel genes were characterized by constructing disruption mutations and by localization of the gene products. Two of them, putative homologues of budding yeast UFE1 (which encodes a t-SNARE) and SFH1 (an essential component of a chromatin-remodeling complex), were essential for viability. Two further genes, which were only conditionally essential, genetically interact with sad1+. One of these was named sif1+ (for Sad1-interacting factor) and is required for proper septum formation at high temperature. Cells in which this gene was overexpressed displayed a wee -like phenotype. The product of the other gene, apm1+, is very similar to the medium chain of an adaptor protein complex in clathrin-coated vesicles. Apm1 appears to be required for SPB separation and spindle formation, and tended to accumulate at the SPB when it was overproduced. It was functionally distinct from its homologues Apm2 and Apm4. Other novel genes identified in this study included one for a nucleoporin and genes encoding novel membrane-bound proteins that were genetically related to Sad1. We found that none of the newly identified genes tested were necessary for centromere/telomere clustering.


Subject(s)
Genes, Fungal/genetics , Schizosaccharomyces pombe Proteins/genetics , Schizosaccharomyces/physiology , Binding Sites , Conserved Sequence , Evolution, Molecular , Fluorescent Antibody Technique, Indirect , In Situ Hybridization, Fluorescence , Recombinant Fusion Proteins/metabolism , Schizosaccharomyces/genetics , Schizosaccharomyces/ultrastructure , Schizosaccharomyces pombe Proteins/metabolism , Spindle Apparatus/genetics , beta-Galactosidase/genetics
4.
EMBO J ; 19(14): 3831-40, 2000 Jul 17.
Article in English | MEDLINE | ID: mdl-10899136

ABSTRACT

A polarized chromosomal arrangement with clustered telomeres in a meiotic prophase nucleus is often called bouquet and is thought to be important for the pairing of homologous chromosomes. Fluorescence in situ hybridization in fission yeast indicated that chromosomal loci are positioned in an ordered manner as anticipated from the bouquet arrangement. Blocking the formation of the telomere cluster with the kms1 mutation created a disorganized chromosomal arrangement, not only for the regions proximal to the telomere but also for interstitial regions. The kms1 mutation also affected the positioning of a linear minichromosome. Consistent with this cytological observation, the frequency of ectopic homologous recombination between a linear minichromosome and a normal chromosome increased in the kms1 background. Intragenic recombination between allelic loci is reduced in the kms1 mutant, but those between non-allelic loci are unaffected or slightly increased. Thus, telomere-led chromosome organization facilitates homologous pairing and also restricts irregular chromosome pairing during meiosis.


Subject(s)
Chromosomes, Fungal/metabolism , Meiosis/genetics , Schizosaccharomyces pombe Proteins , Schizosaccharomyces/genetics , Telomere/metabolism , Alleles , Cell Nucleus/genetics , Cell Nucleus/metabolism , Centromere/genetics , Centromere/metabolism , Chromosomes, Fungal/genetics , Cosmids/genetics , Fungal Proteins/genetics , Fungal Proteins/physiology , In Situ Hybridization, Fluorescence , Mutation/genetics , Recombination, Genetic/genetics , Schizosaccharomyces/cytology , Spindle Apparatus/metabolism , Telomere/genetics
6.
J Cell Biol ; 140(2): 247-58, 1998 Jan 26.
Article in English | MEDLINE | ID: mdl-9442101

ABSTRACT

We have isolated a fission yeast karyogamy mutant, tht1, in which nuclear congression and the association of two spindle pole bodies occurs but the subsequent fusion of nuclear envelopes is blocked. The tht1 mutation does not prevent meiosis, so cells execute meiosis with two unfused nuclei, leading to the production of aberrant asci. The tht1(+) gene was cloned and sequenced. Predicted amino acid sequence has no significant homology to previously known proteins but strongly suggests that it is a type I membrane protein. The tht1(+) gene is dispensable for vegetative growth and expressed only in conjugating cells. Tht1p is a glycoprotein susceptible to endoglycosilase H digestion. Site- directed mutagenesis showed that the N-glycosylation site, as well as the COOH-terminal region of Tht1p, is essential for its function. A protease protection assay indicated that the COOH terminus is cytoplasmic. Immunocytological analysis using a HA-tagged Tht1p suggested that the protein is localized in nuclear envelopes and in the ER during karyogamy and that its levels are reduced in cells containing fused nuclei.


Subject(s)
Fungal Proteins/genetics , Glycoproteins , Nuclear Envelope/physiology , Schizosaccharomyces pombe Proteins , Schizosaccharomyces/genetics , Amino Acid Sequence , Base Sequence , Cloning, Molecular , Fungal Proteins/chemistry , Gene Expression , In Situ Hybridization, Fluorescence , Membrane Fusion Proteins , Molecular Sequence Data , Mutation , Phenotype , Schizosaccharomyces/physiology , Spores
7.
Mol Gen Genet ; 254(3): 238-49, 1997 Apr 16.
Article in English | MEDLINE | ID: mdl-9150257

ABSTRACT

In the meiotic prophase nucleus of the fission yeast Schizosaccharomyces pombe, chromosomes are arranged in an oriented manner: telomeres cluster in close proximity to the spindle pole body (SPB), while centromeres form another cluster at some distance from the SPB. We have isolated a mutant, kms1, in which the structure of the meiotic prophase nucleus appears to be distorted. Using specific probes to localize the SPB and telomeres, multiple signals were observed in the mutant nuclei, in contrast to the case in wild-type. Genetic analysis showed that in the mutant, meiotic recombination frequency was reduced to about one-quarter of the wild-type level and meiotic segregation was impaired. This phenotype strongly suggests that the telomere-led rearrangement of chromosomal distribution that normally occurs in the fission yeast meiotic nucleus is an important prerequisite for the efficient pairing of homologous chromosomes. The kms1 mutant was also impaired in karyogamy, suggesting that the kms1+ gene is involved in SPB function. However, the kms1+ gene is dispensable for mitotic growth. The predicted amino acid sequence of the gene product shows no significant similarity to known proteins.


Subject(s)
Cell Nucleus/genetics , Fungal Proteins/genetics , Genes, Fungal , Meiosis/genetics , Schizosaccharomyces pombe Proteins , Schizosaccharomyces/genetics , Amino Acid Sequence , Base Sequence , Cloning, Molecular , Molecular Sequence Data , Restriction Mapping , Sequence Analysis
8.
J Cell Sci ; 108 ( Pt 2): 569-79, 1995 Feb.
Article in English | MEDLINE | ID: mdl-7769002

ABSTRACT

Fission yeast pap1+ gene encodes an AP-1-like transcription factor, whose overexpression can confer resistance to staurosporine, a protein kinase inhibitor. We have previously identified a target gene (p25) for pap1+, and shown that, crm1+, which is required for maintenance of higher order chromosome structure, negatively regulates pap1-dependent transcription. In this study, we have characterized a novel gene, pad1+, which was isolated as a multicopy plasmid capable of conferring staurosporine-resistance. We showed that high copy pad1+ induces transcriptional activation of the p25 gene and that the induction by pad1+ is dependent on the pap1+ gene. Furthermore, a cis-element analysis of the 5'-region of the p25 gene showed that two elements (an AP-1 site and a 14 bp palindrome sequence) where pap1 binds in vitro is essential for the induction by pad1+. These results indicate that pad1 can positively regulate pap1-dependent transcription. Through an electromobility shift assay we showed that overexpression of pad1+ is not capable of enhancing the DNA-binding activity of pap1 directly. The pad1+ gene encodes a 35 kDa protein that has significant identity (68%) to Caenorhabditis elegans F37A4.5, and is also similar to mouse Mov34 and human C6.1A. Gene disruption experiments have demonstrated that pad1+ is essential for viability. A disruption mutant of pad1+ obtained after spore germination exhibited an elongated cell body with abberantly folded chromosomes. A mitotic plasmid loss experiment also produced similar cells having an abnormal chromosome structure. These suggest that pad1+ may play an important role in higher order chromosome structure. Taken concurrently with our previous results, two essential genes pad1+ and crm1+ regulate pap1-dependent transcription; pad1+ and crm1+ are positive and negative regulators, respectively.


Subject(s)
Chromosomes, Fungal , Fungal Proteins/genetics , Genes, Fungal , Karyopherins , Receptors, Cytoplasmic and Nuclear , Schizosaccharomyces pombe Proteins , Schizosaccharomyces/genetics , Trans-Activators/genetics , Transcription Factors/genetics , Amino Acid Sequence , Animals , Base Sequence , Caenorhabditis elegans/genetics , Chromobox Protein Homolog 5 , Gene Expression Regulation, Fungal , Molecular Sequence Data , Pancreatitis-Associated Proteins , Phenotype , Sequence Homology, Amino Acid , Transcription, Genetic/genetics , Exportin 1 Protein
9.
Mol Cell Biol ; 13(10): 6427-34, 1993 Oct.
Article in English | MEDLINE | ID: mdl-8413241

ABSTRACT

Mitogen-activated protein kinase (MAPK) and its direct activator, MAPK kinase (MAPKK), have been suggested to play a pivotal role in a variety of signal transduction pathways in higher eukaryotes. The fission yeast Schizosaccharomyces pombe carries a gene, named spk1, whose product is structurally related to vertebrate MAPK. Here we show that Spk1 is functionally related to Xenopus MAPK. (i) Xenopus MAPK partially complemented a defect in the spk1- mutant. An spk1- diploid strain could not sporulate, but one carrying Xenopus MAPK could. (ii) Both Spk1 and Xenopus MAPK interfered with sporulation if overexpressed in S. pombe cells. (iii) Spk1 underwent tyrosine phosphorylation as does Xenopus MAPK. Tyrosine phosphorylation of Spk1 appeared to be dependent upon mating signals because it occurred in homothallic cells but not in heterothallic cells. Furthermore, this phosphorylation was diminished in a byr1 disruptant strain, suggesting that spk1 lies downstream of byr1, which encodes a MAPKK homolog in S. pombe. Taken together, the MAPKK-MAPK cascade may be evolutionarily conserved in signaling pathways in yeasts and vertebrates.


Subject(s)
Cell Cycle Proteins , Fungal Proteins/metabolism , Protein Kinases/metabolism , Protein Serine-Threonine Kinases/metabolism , Protein-Tyrosine Kinases/metabolism , Saccharomyces cerevisiae Proteins , Schizosaccharomyces/enzymology , Tyrosine/metabolism , Amino Acid Sequence , Animals , Base Sequence , Biological Evolution , Checkpoint Kinase 2 , DNA, Fungal , Diploidy , Fungal Proteins/genetics , Genes, Fungal , Genetic Complementation Test , Mitogen-Activated Protein Kinase 1 , Molecular Sequence Data , Phosphorylation , Protein Kinases/genetics , Protein Serine-Threonine Kinases/genetics , Protein-Tyrosine Kinases/genetics , Schizosaccharomyces/genetics , Schizosaccharomyces/physiology , Spores, Fungal , Xenopus
11.
EMBO J ; 12(5): 1987-95, 1993 May.
Article in English | MEDLINE | ID: mdl-8491190

ABSTRACT

Two novel protein kinase C (PKC)-like genes, pck1+ and pck2+ were isolated from fission yeast by PCR. Both contain common domains of PKC-related molecules, but lack a putative Ca(2+)-binding domain so that they may belong to the nPKC group. Gene disruption of pck1+ and pck2+ establishes that they share an overlapping essential function for cell viability. Cells of a single pck2 deletion display severe defects in cell shape; they are irregular and sometimes pear-like instead of cylindrical. In contrast, the induced overexpression of pck2+ is lethal, producing multiseptated and branched cells. These results suggest that fission yeast PKC-like genes are involved in the polarity of cell growth control. We show that pck2 is allelic to sts6, a locus we have previously identified by its supersensitivity to staurosporine, a potent protein kinase inhibitor [Toda et al. (1991) Genes Dev., 5, 60-73]. In addition, the lethal overexpression of pck2+ can be suppressed by staurosporine, indicating that fission yeast pck1 and pck2 are molecular targets of this inhibitor.


Subject(s)
Genes, Fungal , Protein Kinase C/genetics , Schizosaccharomyces/genetics , Alkaloids/pharmacology , Amino Acid Sequence , Base Sequence , DNA, Fungal , Molecular Sequence Data , Mutation , Protein Kinase C/antagonists & inhibitors , Schizosaccharomyces/cytology , Schizosaccharomyces/growth & development , Sequence Deletion , Sequence Homology, Amino Acid , Staurosporine
12.
Mol Biol Cell ; 4(3): 303-13, 1993 Mar.
Article in English | MEDLINE | ID: mdl-8387356

ABSTRACT

We isolated a fission yeast putative protein serine/threonine phosphatase gene designated ppe1+ by hybridization. The predicted amino acid sequence is similar to those of the fission yeast ppa2 (53% identity) and dis2 (39%) phosphatases, and highly similar to those of the budding yeast SIT4 (72%), Drosophila PPV (68%) and rabbit PPX (61%) phosphatases. Antibodies against ppe1 protein identified a 37-kd polypeptide in fission yeast. A gene disruption (designated delta ppe1) caused cold-sensitive lethality and short, pear-shaped cells. These phenotypes were fully suppressed by a plasmid carrying ppe1+. Three classes of multicopy suppressor genes for delta ppe1 were identified as follows: 1) ppa1+ and ppa2+ encoding type 2A-like phosphatases, 2) mitotically essential dis3+ similar to the budding yeast SSD1/SRK1, a suppressor for sit4, and 3) pck1+ coding for a protein kinase C-like kinase. Consistently, the budding yeast SIT4 gene was also a multicopy suppressor for delta ppe1. Phosphatase ppe1 may play a role in cell morphogenesis and mitosis by either regulating or being regulated by these multicopy suppressor gene products. Consistent with this hypothesis, double mutants ppe1-ppa2 and ppe1-pck1 are lethal at the permissive temperature.


Subject(s)
Cell Cycle Proteins , Genes, Fungal , Phosphoprotein Phosphatases/genetics , Schizosaccharomyces pombe Proteins , Schizosaccharomyces/enzymology , Schizosaccharomyces/genetics , Amino Acid Sequence , Base Sequence , Cold Temperature , DNA, Fungal/genetics , Gene Expression , Genes, Overlapping , Genes, Suppressor , Mitosis/genetics , Molecular Sequence Data , Multigene Family , Phenotype , Schizosaccharomyces/cytology
13.
Mol Cell Biol ; 12(12): 5474-84, 1992 Dec.
Article in English | MEDLINE | ID: mdl-1448080

ABSTRACT

The fission yeast pap1+ gene encodes an AP-1-like transcription factor that contains a leucine zipper motif. We identified a target gene of pap1, the p25 gene. The 5' upstream region of the p25 gene contains an AP-1 site, and by DNase I footprint analysis, we showed that the pap1 protein binds to the AP-1 site as well as to a 14-bp palindrome sequence. p25 is overproduced when the pap1+ gene is overexpressed, whereas p25 is not produced at all in the pap1 deletion mutant. p25 was previously found to be overproduced in strains carrying cold-sensitive crm1 mutations whose gene product is essential for viability and is thought to play an important role in maintenance of a proper chromosomal architecture. Deletion and site-directed mutagenesis of sequences upstream of the p25 gene demonstrated that the AP-1 site as well as the palindrome sequence are crucial for transcriptional activation either by pap1 overproduction or by the cold-sensitive crm1 mutation; pap1+ is apparently negatively regulated by crm1+. Moreover, we found that cold-sensitive crm1 mutations are suppressed by the deletion of pap1+, further indicating a close relationship between crm1+ and pap1+. The crm1 protein is highly conserved; the budding yeast homolog, CRM1, which complements the fission yeast cold-sensitive crm1 mutation, was isolated and found to also be essential for viability. These results suggest the functional importance of chromosome structure on the regulation of gene expression through the pap1 transcription factor.


Subject(s)
DNA-Binding Proteins/metabolism , Fungal Proteins/metabolism , Gene Expression Regulation, Fungal , Karyopherins , Proto-Oncogene Proteins c-jun/genetics , Receptors, Cytoplasmic and Nuclear , Schizosaccharomyces/genetics , Transcription Factors/metabolism , Transcription, Genetic , Amino Acid Sequence , Base Sequence , Basic-Leucine Zipper Transcription Factors , Binding Sites , Chromobox Protein Homolog 5 , DNA, Fungal , Genes, Fungal , Molecular Sequence Data , Pancreatitis-Associated Proteins , Proto-Oncogene Proteins c-jun/metabolism , Schizosaccharomyces pombe Proteins , Sequence Homology, Amino Acid , Exportin 1 Protein
14.
Mol Biol Cell ; 3(3): 263-73, 1992 Mar.
Article in English | MEDLINE | ID: mdl-1320960

ABSTRACT

The Schizosaccharomyces pombe sts1+ gene, identified by supersensitive mutations to a protein kinase inhibitor, staurosporine, was isolated by complementation by the use of a fission yeast genomic library. Nucleotide sequencing shows that the sts1+ gene encodes a 453 amino acid putative membrane-associated protein that is significantly similar (26% identity) to the chicken lamin B receptor. It is also highly related (53% identity) to a budding yeast ORF, YGL022. These three proteins contain a similar hydrophobicity pattern consisting of eight or nine putative transmembrane domains. By gene disruption we demonstrate that the sts1+ gene is not essential for viability. These disruptants exhibit pleiotropic defects, such as cold-sensitivity for growth and at the permissive temperature, a supersensitivity to divalent cations and several unrelated drugs including staurosporine, caffeine, chloramphenicol, sorbitol, and SDS. Disruption of the sts1+ gene does not lead to a sensitivity to thiabendazole or hydroxyurea.


Subject(s)
Genes, Fungal/genetics , Receptors, Cell Surface/genetics , Receptors, Cytoplasmic and Nuclear , Schizosaccharomyces/genetics , Amino Acid Sequence , Animals , Base Sequence , Cations, Divalent/pharmacology , Chickens , Microbial Sensitivity Tests , Molecular Sequence Data , Sequence Homology, Nucleic Acid , Transformation, Genetic/genetics , Water-Electrolyte Balance/physiology , Lamin B Receptor
15.
Microbiol Immunol ; 36(10): 1029-39, 1992.
Article in English | MEDLINE | ID: mdl-1479959

ABSTRACT

Antibody to Borrelia burgdorferi was examined in 380 healthy and 38 clinical cases of cows from Hokkaido and Shizuoka in Japan. In healthy animals, IgG and IgM antibody to B. burgdorferi HO14 strain were found in 44 cows (14.6%) and 24 cows (8.0%) from Hokkaido. In contrast, antibody-positive case was not observed except for only 1 case which was IgM positive (1/79: 1.3%) in cows from Shizuoka. Mean antibody levels of healthy animals in Hokkaido and Shizuoka were 0.651 and 0.263 (IgG antibody to HO14 strain), 0.642 and 0.169 (IgG to HP3 strain), 0.613 and 0.367 (IgM to HO14 strain) and 0.582 and 0.286 (IgM to HP3 strain). The differences of the antibody levels between cows from Hokkaido and Shizuoka were significant. Seasonal difference was found in seropositive cows from Hokkaido. The rate of seropositive cows was high in summer (23.4% in June and 11.8% in July) but low in winter (0% in January and February). The pattern was discussed to be associated with activation of ticks. One of 4 cows with arthritis showed significantly higher IgG antibody level than that of healthy cows and cows with some disease, although the serum was collected from Shizuoka where antibody-positive animals for B. burgdorferi were rare among healthy cows. This high IgG antibody may suggest that the arthritis of such cows was caused by infection with B. burgdorferi. Two of 7 cows with unclassified abortion showed positive antibody reaction in Hokkaido. These cases, however, may not be related to the B. burgdorferi infection because the positive rate was similar to those of healthy cows in the same season.


Subject(s)
Antibodies, Bacterial/blood , Borrelia burgdorferi Group/immunology , Cattle Diseases/immunology , Lyme Disease/veterinary , Animals , Antibodies, Bacterial/immunology , Arthritis/microbiology , Arthritis/veterinary , Cattle , Cattle Diseases/epidemiology , Cattle Diseases/physiopathology , Enzyme-Linked Immunosorbent Assay/standards , Enzyme-Linked Immunosorbent Assay/veterinary , Japan/epidemiology , Lyme Disease/epidemiology , Lyme Disease/immunology , Lyme Disease/physiopathology , Prevalence , Seasons , Seroepidemiologic Studies
16.
Genes Dev ; 5(1): 60-73, 1991 Jan.
Article in English | MEDLINE | ID: mdl-1899230

ABSTRACT

Staurosporine, a potent inhibitor of protein kinase C, arrests fission yeast cell elongation specifically at a stage immediately after cell division. We isolated two genes, which, when carried on multicopy plasmids, confer drug resistance in fission yeast. One, spk1+, encodes a protein kinase highly similar (54% identity) to those encoded by the mammalian ERK1/MAP2 kinase and the budding yeast KSS1 and FUS3 genes. It is not essential for vegetative growth of Schizosaccharomyces pombe cells but is required for conjugation. The spk1+ gene product is a 45-kD protein enriched in the nucleus, and its level increases 10-fold after addition of staurosporine. The other gene pap1+ encodes an AP-1-like transcription factor that contains a region rich in basic amino acids followed by a "leucine zipper" motif. The pap1+ gene is required for spk1(+)-conferred staurosporine resistance. These two genes appear to function as a part of the fission yeast growth control pathway.


Subject(s)
Alkaloids/pharmacology , DNA-Binding Proteins/genetics , Drug Resistance, Microbial/genetics , Fungal Proteins , Protein Kinases/genetics , Schizosaccharomyces/genetics , Transcription Factors/genetics , Amino Acid Sequence , Animals , Base Sequence , Basic-Leucine Zipper Transcription Factors , Chromosome Mapping , Cloning, Molecular , DNA-Binding Proteins/metabolism , Genes, Fungal , Immunohistochemistry , Molecular Sequence Data , Mutation , Pancreatitis-Associated Proteins , Phenotype , Plasmids , Proto-Oncogene Proteins c-jun , Schizosaccharomyces/enzymology , Schizosaccharomyces pombe Proteins , Sequence Homology, Nucleic Acid , Staurosporine , Transcription, Genetic
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