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  • LUNAR AND PLANETARY EXPLORATION  (38)
  • Animals  (12)
  • Astrophysics
  • EARTH RESOURCES AND REMOTE SENSING
  • 1990-1994  (36)
  • 1985-1989  (18)
  • 1
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    Chromosome 17 deletions and p53 gene mutations in colorectal carcinomas (1989)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1989-04-14
    Description: Previous studies have demonstrated that allelic deletions of the short arm of chromosome 17 occur in over 75% of colorectal carcinomas. Twenty chromosome 17p markers were used to localize the common region of deletion in these tumors to a region contained within bands 17p12 to 17p13.3. This region contains the gene for the transformation-associated protein p53. Southern and Northern blot hybridization experiments provided no evidence for gross alterations of the p53 gene or surrounding sequences. As a more rigorous test of the possibility that p53 was a target of the deletions, the p53 coding regions from two tumors were analyzed; these two tumors, like most colorectal carcinomas, had allelic deletions of chromosome 17p and expressed considerable amounts of p53 messenger RNA from the remaining allele. The remaining p53 allele was mutated in both tumors, with an alanine substituted for valine at codon 143 of one tumor and a histidine substituted for arginine at codon 175 of the second tumor. Both mutations occurred in a highly conserved region of the p53 gene that was previously found to be mutated in murine p53 oncogenes. The data suggest that p53 gene mutations may be involved in colorectal neoplasia, perhaps through inactivation of a tumor suppressor function of the wild-type p53 gene.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Baker, S J -- Fearon, E R -- Nigro, J M -- Hamilton, S R -- Preisinger, A C -- Jessup, J M -- vanTuinen, P -- Ledbetter, D H -- Barker, D F -- Nakamura, Y -- White, R -- Vogelstein, B -- GM07184/GM/NIGMS NIH HHS/ -- GM07309/GM/NIGMS NIH HHS/ -- HD20619/HD/NICHD NIH HHS/ -- etc. -- New York, N.Y. -- Science. 1989 Apr 14;244(4901):217-21.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Oncology Center, Johns Hopkins University School of Medicine, Baltimore, MD 21231.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2649981" target="_blank"〉PubMed〈/a〉
    Keywords: Alleles ; Animals ; *Chromosome Deletion ; *Chromosomes, Human, Pair 17/ultrastructure ; Colorectal Neoplasms/*genetics ; Humans ; Mice ; Mice, Nude ; *Mutation ; Neoplasm Proteins/*genetics ; Nucleic Acid Hybridization ; Oncogenes ; Phosphoproteins/*genetics ; Suppression, Genetic ; Tumor Suppressor Protein p53
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 2
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    A new DNA marker tightly linked to the fragile X locus (FRAXA) (1989)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1989-12-08
    Description: The fragile X syndrome is the most common cause of familial mental retardation. Genetic counseling and gene isolation are hampered by a lack of DNA markers close to the disease locus. Two somatic cell hybrids that each contain a human X chromosome with a breakpoint close to the fragile X locus have been characterized. A new DNA marker (DXS296) lies between the chromosome breakpoints and is the closest marker to the fragile X locus yet reported. The Hunter syndrome gene, which causes iduronate sulfatase deficiency, is located at the X chromosome breakpoint that is distal to this new marker, thus localizing the Hunter gene distal to the fragile X locus.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Suthers, G K -- Callen, D F -- Hyland, V J -- Kozman, H M -- Baker, E -- Eyre, H -- Harper, P S -- Roberts, S H -- Hors-Cayla, M C -- Davies, K E -- New York, N.Y. -- Science. 1989 Dec 8;246(4935):1298-300.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Histopathology, Adelaide Children's Hospital, Australia.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2573953" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Chromosome Mapping ; Female ; Fragile X Syndrome/*genetics ; Genetic Counseling ; *Genetic Linkage ; *Genetic Markers ; Genomic Library ; Humans ; Hybrid Cells ; Likelihood Functions ; Mice ; Mucopolysaccharidosis II/genetics ; Mutation ; Nucleic Acid Hybridization ; Polymorphism, Restriction Fragment Length ; Sex Chromosome Aberrations/*genetics ; Translocation, Genetic
    Print ISSN: 0036-8075
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 3
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    Long-term improvement of hypercholesterolemia after ex vivo gene therapy in LDLR-deficient rabbits (1991)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1991-12-30
    Description: Familial hypercholesterolemia (FH) is an inherited disorder in humans that is caused by a deficiency of low density lipoprotein receptors (LDLRs). An animal model for FH, the Watanabe Heritable Hyperlipidemic rabbit, was used to develop an approach for liver-directed gene therapy based on transplantation of autologous hepatocytes that were genetically corrected ex vivo with recombinant retroviruses. Animals transplanted with LDLR-transduced autologous hepatocytes demonstrated a 30 to 50 percent decrease in total serum cholesterol that persisted for the duration of the experiment (122 days). Recombinant-derived LDLR RNA was harvested from tissues with no diminution for up to 6.5 months after transplantation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chowdhury, J R -- Grossman, M -- Gupta, S -- Chowdhury, N R -- Baker, J R Jr -- Wilson, J M -- P01-DK-42718/DK/NIDDK NIH HHS/ -- R01-DK-34357/DK/NIDDK NIH HHS/ -- R01-DK42193-01/DK/NIDDK NIH HHS/ -- etc. -- New York, N.Y. -- Science. 1991 Dec 20;254(5039):1802-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Internal Medicine, Albert Einstein College of Medicine, Bronx, NY 10461.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1722351" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Gene Expression ; *Genetic Therapy ; Hypercholesterolemia/*genetics/*therapy ; Liver/physiology ; Liver Transplantation/physiology ; RNA/genetics/isolation & purification ; Rabbits ; Receptors, LDL/analysis/*genetics ; Recombinant Proteins/analysis ; Serum Albumin/analysis/genetics ; *Transfection ; beta-Galactosidase/analysis/genetics
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 4
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    Evidence for biased gene conversion in concerted evolution of ribosomal DNA (1991)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1991-01-18
    Description: Concerted evolution is the production and maintenance of homogeneity within repeated families of DNA. Two mechanisms--unequal crossing over and biased gene conversion--have been the principal explanations of concerted evolution. Concerted evolution of ribosomal DNA (rDNA) arrays is thought to be largely the result of unequal crossing over. However, concerted evolution of rDNA in parthenogenetic lizards of hybrid origin is strongly biased toward one of two parental sequences, which is consistent with biased gene conversion as the operative mechanism. The apparent gene conversions are independent of initial genome dosage and result in homogenization of rDNA arrays across all nucleolar organizer regions.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hillis, D M -- Moritz, C -- Porter, C A -- Baker, R J -- New York, N.Y. -- Science. 1991 Jan 18;251(4991):308-10.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Zoology, University of Texas, Austin 78712.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1987647" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Biological Evolution ; Blotting, Southern ; DNA, Ribosomal/*genetics ; Gene Conversion ; Karyotyping ; Lizards ; Nucleic Acid Hybridization ; Parthenogenesis ; Restriction Mapping
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  • 5
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    A multifunctional aqueous channel formed by CFTR (1992)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1992-11-27
    Description: The cystic fibrosis gene product (CFTR) is a complex protein that functions as an adenosine 3,5-monophosphate (cAMP)-stimulated ion channel and possibly as a regulator of intracellular processes. In order to determine whether the CFTR molecule contains a functional aqueous pathway, anion, water, and urea transport were measured in Xenopus oocytes expressing CFTR. Cyclic AMP agonists induced a Cl- conductance of 94 microsiemens and an increase in water permeability of 4 x 10(-4) centimeter per second that was inhibited by a Cl- channel blocker and was dependent on anion composition. CFTR has a calculated single channel water conductance of 9 x 10(-13) cubic centimeter per second, suggesting a pore-like aqueous pathway. Oocytes expressing CFTR also showed cAMP-stimulated transport of urea but not the larger solute sucrose. Thus CFTR contains a cAMP-stimulated aqueous pore that can transport anions, water, and small solutes. The results also provide functional evidence for water movement through an ion channel.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hasegawa, H -- Skach, W -- Baker, O -- Calayag, M C -- Lingappa, V -- Verkman, A S -- DK35124/DK/NIDDK NIH HHS/ -- DK43840/DK/NIDDK NIH HHS/ -- HL42368/HL/NHLBI NIH HHS/ -- etc. -- New York, N.Y. -- Science. 1992 Nov 27;258(5087):1477-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Medicine, University of California, San Francisco 94143-0532.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1279809" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Base Sequence ; Biological Transport/physiology ; Chlorides/metabolism ; Cyclic AMP/physiology ; Cystic Fibrosis Transmembrane Conductance Regulator ; Female ; Humans ; In Vitro Techniques ; Ion Channels/*physiology ; Membrane Proteins/*physiology ; Molecular Sequence Data ; Oocytes ; Urea/metabolism ; Water/metabolism ; Xenopus
    Print ISSN: 0036-8075
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  • 6
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    Spacing differentiation in the developing Drosophila eye: a fibrinogen-related lateral inhibitor encoded by scabrous (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-12-07
    Description: In the development of multicellular organisms a diversity of cell types differentiate at specific positions. Spacing patterns, in which an array of two or more cell types forms from a uniform field of cells, are a common feature of development. Identical precursor cells may adopt different fates because of competition and inhibition between them. Such a pattern in the developing Drosophila eye is the evenly spaced array of R8 cells, around which other cell types are subsequently recruited. Genetic studies suggest that the scabrous mutation disrupts a signal produced by R8 cells that inhibits other cells from also becoming R8 cells. The scabrous locus was cloned, and it appears to encode a secreted protein partly related to the beta and gamma chains of fibrinogen. It is proposed that the sca locus encodes a lateral inhibitor of R8 differentiation. The roles of the Drosophila EGF-receptor homologue (DER) and Notch genes in this process were also investigated.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Baker, N E -- Mlodzik, M -- Rubin, G M -- New York, N.Y. -- Science. 1990 Dec 7;250(4986):1370-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute, University of California, Berkeley 94720.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2175046" target="_blank"〉PubMed〈/a〉
    Keywords: Alleles ; Amino Acid Sequence ; Animals ; Cell Differentiation ; DNA Transposable Elements ; Drosophila/anatomy & histology/*genetics/growth & development ; *Drosophila Proteins ; Eye/anatomy & histology/growth & development ; Fibrinogen/*genetics ; *Glycoproteins ; Humans ; Molecular Sequence Data ; Mosaicism ; *Mutation ; Phenotype ; Proteins/*genetics ; Receptor, Epidermal Growth Factor/genetics ; Sequence Homology, Nucleic Acid
    Print ISSN: 0036-8075
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  • 7
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    K+ current diversity is produced by an extended gene family conserved in Drosophila and mouse (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-05-04
    Description: The Drosophila Shaker gene on the X chromosome has three sister genes, Shal, Shab, and Shaw, which map to the second and third chromosomes. This extended gene family encodes voltage-gated potassium channels with widely varying kinetics (rate of macroscopic current activation and inactivation) and voltage sensitivity of steady-state inactivation. The differences in the currents of the various gene products are greater than the differences produced by alternative splicing of the Shaker gene. In Drosophila, the transient (A current) subtype of the potassium channel (Shaker and Shal) and the delayed-rectifier subtype (Shab and Shaw) are encoded by homologous genes, and there is more than one gene for each subtype of channel. Homologs of Shaker, Shal, Shab, and Shaw are present in mammals; each Drosophila potassium-channel gene may be represented as a multigene subfamily in mammals.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wei, A -- Covarrubias, M -- Butler, A -- Baker, K -- Pak, M -- Salkoff, L -- 1 RO1-NS24785-01/NS/NINDS NIH HHS/ -- GMO 7200/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1990 May 4;248(4955):599-603.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Anatomy and Neurobiology, Washington University School of Medicine, St. Louis, MO 63110.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2333511" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; *Chromosome Mapping ; Drosophila/*genetics ; Drosophila Proteins ; Female ; Membrane Proteins/*genetics/physiology ; Mice/*genetics ; Molecular Sequence Data ; *Multigene Family ; Oocytes/physiology ; Potassium Channels/*physiology ; Sequence Homology, Nucleic Acid ; Shab Potassium Channels ; Transcription, Genetic ; *X Chromosome ; Xenopus
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  • 8
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    Treatment of established renal cancer by tumor cells engineered to secrete interleukin-4 (1991)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1991-11-01
    Description: The generation of antigen-specific antitumor immunity is the ultimate goal in cancer immunotherapy. When cells from a spontaneously arising murine renal cell tumor were engineered to secrete large doses of interleukin-4 (IL-4) locally, they were rejected in a predominantly T cell-independent manner. However, animals that rejected the IL-4-transfected tumors developed T cell-dependent systemic immunity to the parental tumor. This systemic immunity was tumor-specific and primarily mediated by CD8+ T cells. Established parental tumors could be cured by the systemic immune response generated by injection of the genetically engineered tumors. These results provide a rationale for the use of lymphokine gene-transfected tumor cells as a modality for cancer therapy.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Golumbek, P T -- Lazenby, A J -- Levitsky, H I -- Jaffee, L M -- Karasuyama, H -- Baker, M -- Pardoll, D M -- New York, N.Y. -- Science. 1991 Nov 1;254(5032):713-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Medicine, Johns Hopkins University, Baltimore, MD 21205.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1948050" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Carcinoma, Renal Cell/genetics/immunology/pathology/*therapy ; Cell Division ; Cell Line ; *Immunotherapy ; Interleukin-4/*genetics/secretion ; Kidney Neoplasms/genetics/immunology/pathology/*therapy ; Lymphocyte Depletion ; Mice ; Mice, Inbred BALB C ; Mice, SCID ; Neoplasm Transplantation ; *Protein Engineering ; T-Lymphocyte Subsets/immunology ; Transfection
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  • 9
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    Discovery of a peptide-based renin inhibitor with oral bioavailability and efficacy (1992)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1992-09-25
    Description: Peptidic renin inhibitors have been poorly absorbed across the intestine or rapidly eliminated by the liver and have been reported to have oral bioavailabilities of less than 2%. A peptide-based renin inhibitor, A-72517 (molecular mass of 706 daltons), was devised that has oral bioavailabilities of 8, 24, 32, and 53% in the monkey, rat, ferret, and dog, respectively. Dose-related reductions in blood pressure, plasma renin activity, and plasma angiotensin II in parallel with increased plasma drug concentrations were observed after oral administration of A-72517 to conscious, salt-depleted dogs. Thus, peptide-based molecules of sizable molecular mass can be absorbed intact into the systemic circulation of animals. These findings support the potential of peptide-based drugs for oral administration.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kleinert, H D -- Rosenberg, S H -- Baker, W R -- Stein, H H -- Klinghofer, V -- Barlow, J -- Spina, K -- Polakowski, J -- Kovar, P -- Cohen, J -- New York, N.Y. -- Science. 1992 Sep 25;257(5078):1940-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Abbott Laboratories, Abbott Park, IL 60064.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1411510" target="_blank"〉PubMed〈/a〉
    Keywords: Administration, Oral ; Animals ; Biological Availability ; Hemodynamics/drug effects ; Peptides ; Piperazines/chemistry/pharmacokinetics/*pharmacology ; Protease Inhibitors/chemistry/*metabolism/pharmacokinetics ; Renin/*antagonists & inhibitors ; Structure-Activity Relationship ; Thiazoles/chemistry/pharmacokinetics/*pharmacology
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  • 10
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    A processing stream in mammalian visual cortex neurons for non-Fourier responses (1993)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1993-07-02
    Description: Mammalian striate and circumstriate cortical neurons have long been understood as coding spatially localized retinal luminance variations, providing a basis for computing motion, stereopsis, and contours from the retinal image. However, such perceptual attributes do not always correspond to the retinal luminance variations in natural vision. Recordings from area 17 and 18 neurons of the cat revealed a specialized nonlinear processing stream that responds to stimulus attributes that have no corresponding luminance variations. This nonlinear stream acts in parallel to the conventional luminance processing of single cortical neurons. The two streams were consistent in their preference for orientation and direction of motion but distinct in processing spatial variations of the stimulus attributes.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Zhou, Y X -- Baker, C L Jr -- New York, N.Y. -- Science. 1993 Jul 2;261(5117):98-101.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Psychology, McGill University, Montreal, Quebec, Canada.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8316862" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cats ; Fourier Analysis ; Neurons/*physiology ; Photic Stimulation ; Visual Cortex/cytology/*physiology ; *Visual Perception
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