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  • 1
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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
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
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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
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 3
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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
    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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  • 4
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    Fragile X genotype characterized by an unstable region of DNA (1991)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1991-05-24
    Description: DNA sequences have been located at the fragile X site by in situ hybridization and by the mapping of breakpoints in two somatic cell hybrids that were constructed to break at the fragile site. These hybrids were found to have breakpoints in a common 5-kilobase Eco RI restriction fragment. When this fragment was used as a probe on the chromosomal DNA of normal and fragile X genotype individuals, alterations in the mobility of the sequences detected by the probe were found only in fragile X genotype DNA. These sequences were of an increased size in all fragile X individuals and varied within families, indicating that the region was unstable. This probe provides a means with which to analyze fragile X pedigrees and is a diagnostic reagent for the fragile X genotype.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Yu, S -- Pritchard, M -- Kremer, E -- Lynch, M -- Nancarrow, J -- Baker, E -- Holman, K -- Mulley, J C -- Warren, S T -- Schlessinger, D -- New York, N.Y. -- Science. 1991 May 24;252(5009):1179-81.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Cytogenetics and Molecular Genetics, Adelaide Children's Hospital, South Australia.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2031189" target="_blank"〉PubMed〈/a〉
    Keywords: Chromosome Mapping ; DNA/*genetics ; Female ; Fragile X Syndrome/*genetics ; Genotype ; Humans ; Hybrid Cells/cytology ; Male ; Nucleic Acid Hybridization ; Reference Values ; Restriction Mapping ; X Chromosome
    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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  • 5
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    5-Bromodeoxyuridine inhibits sequence changes within inverted repeat DNA during embryogenesis (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1979-08-24
    Description: Previous studies on the genome of Strongylocentrotus purpuratus sea urchin have shown that changes in the nucleotide sequence of inverted repeat sequences occur during embryogenesis. The present study indicates that these sequence changes fail to occur when the embryos are raised in the presence of 5-bromodeoxyuridine. This drug is an analog of thymidine, is incorporated into the DNA during embryogenesis, and inhibits cell differentiation in these embryos.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Dickinson, D G -- Baker, R F -- New York, N.Y. -- Science. 1979 Aug 24;205(4408):816-8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/572583" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Base Sequence/*drug effects ; Bromodeoxyuridine/*pharmacology ; DNA Replication/*drug effects ; Female ; Ovum/*metabolism ; Sea Urchins
    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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  • 6
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    Sequence and expression of human estrogen receptor complementary DNA (1986)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1986-03-07
    Description: The mechanism by which the estrogen receptor and other steroid hormone receptors regulate gene expression in eukaryotic cells is not well understood. In this study, a complementary DNA clone containing the entire translated portion of the messenger RNA for the estrogen receptor from MCF-7 human breast cancer cells was sequenced and then expressed in Chinese hamster ovary (CHO-K1) cells to give a functional protein. An open reading frame of 1785 nucleotides in the complementary DNA corresponded to a polypeptide of 595 amino acids and a molecular weight of 66,200, which is in good agreement with published molecular weight values of 65,000 to 70,000 for the estrogen receptor. Homogenates of transformed Chinese hamster ovary cells containing a protein that bound [3H]estradiol and sedimented as a 4S complex in salt-containing sucrose gradients and as an 8 to 9S complex in the absence of salt. Interaction of this receptor-[3H]estradiol complex with a monoclonal antibody that is specific for primate ER confirms the identity of the expressed complementary DNA as human estrogen receptor. Amino acid sequence comparisons revealed significant regional homology among the human estrogen receptor, the human glucocorticoid receptor, and the putative v-erbA oncogene product. This suggests that steroid receptor genes and the avian erythroblastosis viral oncogene are derived from a common primordial gene. The homologous region, which is rich in cysteine, lysine, and arginine, may represent the DNA-binding domain of these proteins.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Greene, G L -- Gilna, P -- Waterfield, M -- Baker, A -- Hort, Y -- Shine, J -- CA-02897/CA/NCI NIH HHS/ -- HD17103/HD/NICHD NIH HHS/ -- New York, N.Y. -- Science. 1986 Mar 7;231(4742):1150-4.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3753802" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Amino Acids/analysis ; Antibodies, Monoclonal ; Base Sequence ; Cells, Cultured ; Cloning, Molecular ; DNA/*metabolism ; Female ; Humans ; Molecular Weight ; Receptors, Estrogen/*genetics ; Transformation, Genetic
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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