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Articles 31 - 60 of 80
Full-Text Articles in Life Sciences
Predictive Dna Testing And Prophylactic Thyroidectomy In Patients At Risk For Multiple Endocrine Neoplasia Type 2a, Samuel Wells, David Chi, Koi Toshima, Louis Dehner, Cheryl Coffin, S. Dowton, Jennifer Ivanovich, Mary Debenedettl, William Dilley, Jeffrey Moley, Jeffrey Norton, Helen Donis-Keller
Predictive Dna Testing And Prophylactic Thyroidectomy In Patients At Risk For Multiple Endocrine Neoplasia Type 2a, Samuel Wells, David Chi, Koi Toshima, Louis Dehner, Cheryl Coffin, S. Dowton, Jennifer Ivanovich, Mary Debenedettl, William Dilley, Jeffrey Moley, Jeffrey Norton, Helen Donis-Keller
Helen Donis-Keller
Background: Missense germ-line mutations in the RET protooncogene are associated with multiple endocrine neoplasia type 2A (MEN 2A). Detection of these mutant alleles in kindred members predicts disease inheritance and provides the basis for preventative thyroidectomy. Methods: A polymerase chain reaction (PCR)-based genetic test for the 19 known RET mutations was designed to study 132 members of 7 kindreds with MEN 2A. Haplotypes also were constructed using genetic markers flanking the MEN 2A locus. Plasma calcitonin (CT) concentrations were determined before and after provocative testing. Results: Direct DNA testing and haplotype analysis showed that 21 of 58 kindred members at …
A New Class Of Homoserine Lactone Quorum-Sensing Signals, Amy Schaefer, E Greenberg, Colin Oliver, Yasuhiro Oda, Jean Huang, Gili Bittan-Banin, Caroline Peres, Silke Schmidt, Katarina Juhaszova, Janice Sufrin, Caroline Harwood
A New Class Of Homoserine Lactone Quorum-Sensing Signals, Amy Schaefer, E Greenberg, Colin Oliver, Yasuhiro Oda, Jean Huang, Gili Bittan-Banin, Caroline Peres, Silke Schmidt, Katarina Juhaszova, Janice Sufrin, Caroline Harwood
Jean J. Huang
Quorum sensing is a term used to describe cell-to-cell communication that allows cell-density-dependent gene expression. Many bacteria use acyl-homoserine lactone (acyl-HSL) synthases to generate fatty acyl-HSL quorum-sensing signals, which function with signal receptors to control expression of specific genes. The fatty acyl group is derived from fatty acid biosynthesis and provides signal specificity, but the variety of signals is limited. Here we show that the photosynthetic bacterium Rhodopseudomonas palustris uses an acyl-HSL synthase to produce p-coumaroyl-HSL by using environmental p-coumaric acid rather than fatty acids from cellular pools. The bacterium has a signal receptor with homology to fatty acyl-HSL receptors …
Acyl‐Hsl Signal Decay: Intrinsic To Bacterial Cell–Cell Communications, Ya-Juan Wang, Jean Huang, Jared Leadbetter
Acyl‐Hsl Signal Decay: Intrinsic To Bacterial Cell–Cell Communications, Ya-Juan Wang, Jean Huang, Jared Leadbetter
Jean J. Huang
No abstract available.
The Acid Stress Response Of The Cyanobacterium Synechocystis Sp. Strain Pcc 6308, Jean Huang, Nancy Kolodny, Jennifer Redfearn, Mary Allen
The Acid Stress Response Of The Cyanobacterium Synechocystis Sp. Strain Pcc 6308, Jean Huang, Nancy Kolodny, Jennifer Redfearn, Mary Allen
Jean J. Huang
The cyanobacterium Synechocystis sp. strain PCC 6308 has been shown to exhibit predictable physiological responses to acid stress. Originally isolated from a Wisconsin lake, this cyanobacterium grows optimally under alkaline conditions in the laboratory. After acid stress at a pH of between 4.4 and 7.7, cells return to exponential growth following a lag phase. The organism's response to this tolerable acid stress involves cell concentration-dependent neutralization of the external medium to pH 6 or above within 5 min, maintenance of a transmembrane pH gradient, and maintenance of photosystem II efficiency. Lethal acid stress, at a pH below 4.4, results in …
Identification Of Quip, The Product Of Gene Pa1032, As The Second Acyl-Homoserine Lactone Acylase Of Pseudomonas Aeruginosa Pao1, Jean Huang, Ashley Petersen, Marvin Whiteley, Jared Leadbetter
Identification Of Quip, The Product Of Gene Pa1032, As The Second Acyl-Homoserine Lactone Acylase Of Pseudomonas Aeruginosa Pao1, Jean Huang, Ashley Petersen, Marvin Whiteley, Jared Leadbetter
Jean J. Huang
The relevance of the acyl homoserine lactone (acyl-HSL) quorum signals N-3-oxododecanoyl-homoserine lactone (3OC12HSL) and N-butanoyl-homoserine lactone to the biology and virulence of Pseudomonas aeruginosa is well investigated. Previously, P. aeruginosa was shown to degrade long-chain, but not short-chain, acyl-HSLs as sole carbon and energy sources (J. J. Huang, J.-I. Han, L.-H. Zhang, and J. R. Leadbetter, Appl. Environ. Microbiol. 69:5941-5949, 2003). A gene encoding an enzyme with acyl-HSL acylase activity, pvdQ (PA2385), was identified, but it was not required for acyl-HSL utilization. This indicated that P. aeruginosa encodes another acyl-HSL acylase, which we identify here. A comparison …
Utilization Of Acyl-Homoserine Lactone Quorum Signals For Growth By A Soil Pseudomonad And Pseudomonas Aeruginosa Pao1, Jean Huang, Jong-In Han, Lian-Hui Zhang, Jared Leadbetter
Utilization Of Acyl-Homoserine Lactone Quorum Signals For Growth By A Soil Pseudomonad And Pseudomonas Aeruginosa Pao1, Jean Huang, Jong-In Han, Lian-Hui Zhang, Jared Leadbetter
Jean J. Huang
Acyl-homoserine lactones (AHLs) are employed by several Proteobacteria as quorum-sensing signals. Past studies have established that these compounds are subject to biochemical decay and can be used as growth nutrients. Here we describe the isolation of a soil bacterium, Pseudomonas strain PAI-A, that degrades 3-oxododecanoyl-homoserine lactone (3OC12HSL) and other long-acyl, but not short-acyl, AHLs as sole energy sources for growth. The small-subunit rRNA gene from strain PAI-A was 98.4% identical to that of Pseudomonas aeruginosa, but the soil isolate did not produce obvious pigments or AHLs or grow under denitrifying conditions or at 42°C. The quorum-sensing bacterium P. aeruginosa, which …
Method Of Identifying Agents That Inhibit Quorum Sensing Activity Of Gamma-Proteobacteria, Jean Huang, Jared Leadbetter
Method Of Identifying Agents That Inhibit Quorum Sensing Activity Of Gamma-Proteobacteria, Jean Huang, Jared Leadbetter
Jean J. Huang
Screening assays that allow for the identification of agents that increase acyl homoserine lactone (AHL) acylase expression and/or AHL acylase activity in γ-proteobacteria such as Pseudomonas aeruginosa. Such agents are useful, for example, for inhibiting quorum sensing activity of such bacteria by increasing degradation of long chain, but not short chain, AHLs and, therefore, can be useful for treating infections by such bacteria.
Production Of Hydrogen Gas From Light And The Inorganic Electron Donor Thiosulfate By Rhodopseudomonas Palustris, Jean Huang
Jean J. Huang
A challenge for photobiological production of hydrogen gas (H2) as a potential biofuel is to find suitable electron-donating feedstocks. Here, we examined the inorganic compound thiosulfate as a possible electron donor for nitrogenase-catalyzed H2 production by the purple nonsulfur phototrophic bacterium (PNSB) Rhodopseudomonas palustris. Thiosulfate is an intermediate of microbial sulfur metabolism in nature and is also generated in industrial processes. We found that R. palustris grew photoautotrophically with thiosulfate and bicarbonate and produced H2 when nitrogen gas was the sole nitrogen source (nitrogen-fixing conditions). In addition, illuminated nongrowing R. palustris cells converted about 80% of available electrons from thiosulfate …
Self-Assembling Short Oligopeptides And The Promotion Of Angiogenesis, Alisha Sarang-Sieminski, Daria Narmoneva, Olumuyiwa Oni, Shugang Zhang, Jonathan Gertler, Roger Kamm, Richard Lee
Self-Assembling Short Oligopeptides And The Promotion Of Angiogenesis, Alisha Sarang-Sieminski, Daria Narmoneva, Olumuyiwa Oni, Shugang Zhang, Jonathan Gertler, Roger Kamm, Richard Lee
Alisha L. Sarang-Sieminski
Because an adequate blood supply to and within tissues is an essential factor for successful tissue regeneration, promoting a functional microvasculature is a crucial factor for biomaterials. In this study, we demonstrate that short self-assembling peptides form scaffolds that provide an angiogenic environment promoting long-term cell survival and capillary-like network formation in three-dimensional cultures of human microvascular endothelial cells. Our data show that, in contrast to collagen type I, the peptide scaffold inhibits endothelial cell apoptosis in the absence of added angiogenic factors, accompanied by enhanced gene expression of the angiogenic factor VEGF. In addition, our results suggest that the …
Salmon Fibrin Supports An Increased Number Of Sprouts And Decreased Degradation While Maintaining Sprout Length Relative To Human Fibrin In An In Vitro Angiogenesis Model, Alisha Sarang-Sieminski, Keith Gooch
Salmon Fibrin Supports An Increased Number Of Sprouts And Decreased Degradation While Maintaining Sprout Length Relative To Human Fibrin In An In Vitro Angiogenesis Model, Alisha Sarang-Sieminski, Keith Gooch
Alisha L. Sarang-Sieminski
Salmon-derived fibrin has been proposed as a preferred alternative to human or bovine fibrin because of its reduced potential for disease transmission. Here we evaluate salmon fibrin as an alternative ECM support for therapeutic angiogenesis applications, such as vascularizing engineered tissues. Human umbilical vein endothelial cells (HUVEC) seeded on gelatin beads and suspended in either salmon or human fibrin sprouted and formed capillary-like structures. Sprout length was generally increased with the addition of bFGF and VEGF and further increased with the addition of phorbol myristate acetate (PMA). The number of sprouts per bead was increased 61-188% in salmon fibrin relative …
Migration Of Tumor Cells In 3d Matrices Is Governed By Matrix Stiffness Along With Cell-Matrix Adhesion And Proteolysis, Alisha Sarang-Sieminski, Muhammad Zaman, Linda Trapani, Drew Mackellar, Haiyan Gong, Roger Kamm, Alan Wells, Douglas Lauffenburger, Paul Matsudaira
Migration Of Tumor Cells In 3d Matrices Is Governed By Matrix Stiffness Along With Cell-Matrix Adhesion And Proteolysis, Alisha Sarang-Sieminski, Muhammad Zaman, Linda Trapani, Drew Mackellar, Haiyan Gong, Roger Kamm, Alan Wells, Douglas Lauffenburger, Paul Matsudaira
Alisha L. Sarang-Sieminski
Cell migration on 2D surfaces is governed by a balance between counteracting tractile and adhesion forces. Although biochemical factors such as adhesion receptor and ligand concentration and binding, signaling through cell adhesion complexes, and cytoskeletal structure assembly/disassembly have been studied in detail in a 2D context, the critical biochemical and biophysical parameters that affect cell migration in 3D matrices have not been quantitatively investigated. We demonstrate that, in addition to adhesion and tractile forces, matrix stiffness is a key factor that influences cell movement in 3D. Cell migration assays in which Matrigel density, fibronectin concentration, and β1 integrin binding are …
Association Between Prostate Cancer In Black Americans And An Allele Of The Padprp Pseudogene Locus On Chromosome 13, Helen Donis-Keller, Jennifer Doll, B Suarez
Association Between Prostate Cancer In Black Americans And An Allele Of The Padprp Pseudogene Locus On Chromosome 13, Helen Donis-Keller, Jennifer Doll, B Suarez
Helen Donis-Keller
Black American men have a higher incidence of cancer of the prostate (CAP), multiple myeloma, and lung cancer than do white American men (discussed by Lyn et al.1993a). The basis for these differences no doubt includes environmental influences, because American blacks have also been found to have a higher incidence of CAP than do African blacks. However, genetic factors may play a role as well. For example, Lyn et al. (1993a) reported an increase in the frequency of an allele of the poly(ADPribose)polymerase (PADPRP) pseudogene locus onchromosome 13 in black Americans with CAP, suggesting the presence of a disease-susceptibility locus. …
Identification Of Sonic Hedgehog As A Candidate Gene Responsible For Holoprosencephaly, Helen Donis-Keller, E Belloni, M Muenke, E Roessler, G Traverse, J Siegel-Bartelt, A Frumkin, H Mitchell, C Helms, A Hing, H Heng, B Kroop, D Martindale, J Rommens, L Tsui, S Scherer
Identification Of Sonic Hedgehog As A Candidate Gene Responsible For Holoprosencephaly, Helen Donis-Keller, E Belloni, M Muenke, E Roessler, G Traverse, J Siegel-Bartelt, A Frumkin, H Mitchell, C Helms, A Hing, H Heng, B Kroop, D Martindale, J Rommens, L Tsui, S Scherer
Helen Donis-Keller
Holoprosencephaly (HPE) is a genetically and phenotypically heterogenous disorder involving the development of forebrain and midface, with an incidence of 1:16,000 live born and 1:250 induced abortions. This disorder is associated with several distinct facies and phenotypic variability: in the most extreme cases, anophthalmia or cyclopia is evident along with a congenital absence of the mature nose. The less severe form features facial dysmorphia characterized by ocular hypertelorism, defects of the upper lip and/or nose, and absence of the olfactory nerves or corpus callosum. Several intermediate phenotypes involving both the brain and face have been described. One of the gene …
Functional Characterization Of An Epidermal Growth Factor Receptor/Ret Chimera, Helen Donis-Keller, Sunil Pandit, Timothy O'Hare, Linda Pike
Functional Characterization Of An Epidermal Growth Factor Receptor/Ret Chimera, Helen Donis-Keller, Sunil Pandit, Timothy O'Hare, Linda Pike
Helen Donis-Keller
The RET (combined in ransfection) gene encodes a receptor tyrosine kinase homolog involved in innervation of the gut and renal development. A chimeric epidermal growth factor receptor (EGFR)/RET receptor was constructed which contained the extracellular and transmembrane domains of the EGF receptor fused to the intracellular domain of RET. This construct was expressed in NIH 3T3 cells, and the functional properties of the receptor were characterized and compared with those of the wild type EGF receptor. Whereas the EGF receptor exhibited both high and low affinity binding sites for 125I-EGF, the EGFR/RET chimera exhibited only low affinity binding …
7q11.23 Deletions In Williams Syndrome Arise As A Consequence Of Unequal Meiotic Crossover, Helen Donis-Keller, Zsolt Urbán, C Helms, G Fekete, Katalin Csiszár, D Bonnet, A Munnich, C Boyd
7q11.23 Deletions In Williams Syndrome Arise As A Consequence Of Unequal Meiotic Crossover, Helen Donis-Keller, Zsolt Urbán, C Helms, G Fekete, Katalin Csiszár, D Bonnet, A Munnich, C Boyd
Helen Donis-Keller
Williams syndrome (WS) (Williams et al. 1961; Beurenet al. 1962) is a multisystem disorder characterized by mental retardation, a specific neurobehavioral profile,characteristic facies, infantile hypercalcemia, cardiovascular abnormalities, progressive joint limitation, hernias, and soft skin. Recent studies have shown that hemizygosity at the elastin (ELN) gene locus on chromosome7q is associated with WS (Ewart et al. 1993). Furthermore, two FISH studies using cosmid recombinants containing the 5' or the 3' end of the ELN gene revealed deletion of the entire ELN gene in 90%-96% of classical WS cases (Lowery et al. 1995; Nickerson et al. 1995). However, the size of the …
Comparative Genomic Hybridization Of Human Malignant Gliomas Reveals Multiple Amplification Sites And Nonrandom Chromosomal Gains And Losses, Helen Donis-Keller, Evelin Schròck, Gundula Thiel, Tanka Lozanova, Stanislas Du Manoir, Marie-Christine Meffert, Anna Jauch, Michael Speicher, Peter Nürnberg, Siegfried Vogel, Werner Janisch, Thomas Ried, Regine Witkowski, Thomas Cremer
Comparative Genomic Hybridization Of Human Malignant Gliomas Reveals Multiple Amplification Sites And Nonrandom Chromosomal Gains And Losses, Helen Donis-Keller, Evelin Schròck, Gundula Thiel, Tanka Lozanova, Stanislas Du Manoir, Marie-Christine Meffert, Anna Jauch, Michael Speicher, Peter Nürnberg, Siegfried Vogel, Werner Janisch, Thomas Ried, Regine Witkowski, Thomas Cremer
Helen Donis-Keller
Nine human malignant gliomas (2 astrocytomas grade III and 7 glioblastomas) were analyzed using comparative genomic hybridization (CGH). In addition to the amplification of the EGFR gene at 7p12 in 4 of 9 cases, six new amplification sites were mapped to 1q32, 4q12, 7q21.1, 7q21.2-3, 12p, and 22q12. Nonrandom chromosomal gains and losses were identified with overrepresentation of chromosome 7 and underrepresentation of chromosome 10 as the most frequent events (1 of 2 astrocytomas, 7 of 7 glioblastomas). Gain of a part or the whole chromosome 19 and losses of chromosome bands 9pter-23 and 22q13 were detected each in five …
Recombinant Mapping Of The Familial Hyperinsulinism Gene To An 0.8 Cm Region On Chromosome 11p15.1 And Demonstration Of A Founder Effect In Ashkenazi Jews, Helen Donis-Keller, Benjamin Glaser, Ken Chiu, Li Liu, Roberto Anker, Ann Nestorowicz, Nancy Cox, Heddy Landau, Kalser Nurit, Paul Thornton, Charles Stanley, Erol Cerasl, Lester Baker, M. Alan Permutt
Recombinant Mapping Of The Familial Hyperinsulinism Gene To An 0.8 Cm Region On Chromosome 11p15.1 And Demonstration Of A Founder Effect In Ashkenazi Jews, Helen Donis-Keller, Benjamin Glaser, Ken Chiu, Li Liu, Roberto Anker, Ann Nestorowicz, Nancy Cox, Heddy Landau, Kalser Nurit, Paul Thornton, Charles Stanley, Erol Cerasl, Lester Baker, M. Alan Permutt
Helen Donis-Keller
A gene for autosomal recessive familial hyperinsulinism (HI) (OMIM: 256450), a neonatal metabolic disease characterized by inappropriate insulin secretion in the presence of severe hypoglycemia, was recently mapped to a 6.6 cM interval between the markers D11S926 and D11S928 onchromosome 11p in 15 families (1). In the current study we evaluated six additional families and five new markers, and further localized the gene between D11S419 and D11S1310. Using genotype data from CEPH Version 7 and data generated from this study, this region was estimated to be 0.8 cM in length. Significant linkage disequilibrium between markers and the HIgene was observed …
Sequence-Ready Contig For The 1.4-Cm Ductal Carcinoma In Situ Loss Of Heterozygosity Region On Chromosome 8p22–P23, Helen Donis-Keller, Jen Wang, Diane Radford, Matthew Holt, C Helms, A Goate, W Brandt, M Parik, Nancy Phillips, K Deschryver, M Schuh, Keri Fair, Jon Ritter, P Marshall
Sequence-Ready Contig For The 1.4-Cm Ductal Carcinoma In Situ Loss Of Heterozygosity Region On Chromosome 8p22–P23, Helen Donis-Keller, Jen Wang, Diane Radford, Matthew Holt, C Helms, A Goate, W Brandt, M Parik, Nancy Phillips, K Deschryver, M Schuh, Keri Fair, Jon Ritter, P Marshall
Helen Donis-Keller
We report the construction of an ∼1.7-Mb sequence-ready YAC/BAC clone contig of 8p22–p23. This chromosomal region has been associated with frequent loss of heterozygosity (LOH) in breast, ovarian, prostate, head and neck, and liver cancer. We first constructed a meiotic linkage map for 8p to resolve previously reported conflicting map orders from the literature. The target region containing a putative tumor suppressor gene was defined by allelotyping 65 cases of sporadic ductal carcinoma in situ with 18 polymorphic markers from 8p. The minimal region of loss encompassed the interval between D8S520 and D8S261, and one tumor had loss of D8S550 …
Isolation, Characterization, And Chromosomal Mapping Of The Human Nkx6.1 Gene (Nkx6a), A New Pancreatic Islet Homeobox Gene, Helen Donis-Keller, Hiroshi Inoue, Abraham Rudnick, Michael German, Rosalie Veile, M. Alan Permutt
Isolation, Characterization, And Chromosomal Mapping Of The Human Nkx6.1 Gene (Nkx6a), A New Pancreatic Islet Homeobox Gene, Helen Donis-Keller, Hiroshi Inoue, Abraham Rudnick, Michael German, Rosalie Veile, M. Alan Permutt
Helen Donis-Keller
Nkx6.1 (gene symbol NKX6A), a new member of the NK homeobox gene family, was recently identified in rodent pancreatic islet β-cell lines. The pattern of expression suggested that this gene product might be important for control of islet development and/or regulation of insulin biosynthesis. We now report cloning of human NKX6A, characterization of its genomic structure, and its chromosomal localization. The predicted protein of human NKX6A contained 367 amino acids and had 97% identity to the hamster protein. The highly conserved NK decapeptide and homeodomain regions were identical between human and hamster, suggesting functional importance of these domains. The coding …
Identification Of A Human Lmx1 (Lmx1.1)-Related Gene, Lmx1.2: Tissue-Specific Expression And Linkage Mapping On Chromosome 9, Helen Donis-Keller, Christopher Iannotti, Hiroshi Inoue, Ernesto Bernal-Mizrachi, Minoru Aoki, Li Liu, Michael German, M. Alan Permutt
Identification Of A Human Lmx1 (Lmx1.1)-Related Gene, Lmx1.2: Tissue-Specific Expression And Linkage Mapping On Chromosome 9, Helen Donis-Keller, Christopher Iannotti, Hiroshi Inoue, Ernesto Bernal-Mizrachi, Minoru Aoki, Li Liu, Michael German, M. Alan Permutt
Helen Donis-Keller
LMX1 is a LIM-homeodomain (LIM-HD)-containing protein expressed selectively in insulin-producing β-cell lines, and it it has been shown to activate insulin gene transcription. The human LMX1 gene was mapped by fluorescencein situhybridization to chromosome region 1q22–q23, yet Churchet al.(1994,Nat. Genet.6: 98–105) identified two exon-trapping products from human chromosome 9 that were highly homologous to hamster LMX1. In the current study, we demonstrate tissue-specific expression of an LMX1 (now known as LMX1.1)-related gene, named LMX1.2. The chicken C-LMX1 gene, recently cloned using the hamster LMX1.1 sequence and shown to specify dorsal cell fate during vertebrate …
Supravalvular Aortic Stenosis: A Splice Site Mutation Within The Elastin Gene Results In Reduced Expression Of Two Aberrantly Spliced Transcripts, Helen Donis-Keller, Zsolt Urbán, Virginia Michels, Stephen Thibodeau, Katalin Csiszár, C Boyd
Supravalvular Aortic Stenosis: A Splice Site Mutation Within The Elastin Gene Results In Reduced Expression Of Two Aberrantly Spliced Transcripts, Helen Donis-Keller, Zsolt Urbán, Virginia Michels, Stephen Thibodeau, Katalin Csiszár, C Boyd
Helen Donis-Keller
We have screened the elastin gene for mutations responsible for supravalvular aortic stenosis (SVAS) in two large, independently collected families with isolated (nonsyndromic) SVAS. By single-strand conformation polymorphism and heteroduplex analysis, we have identified a C to G transversion within the acceptor splice site of exon 16 in SVAS patients from both families. This mutation segregates in both families with high penetrance of SVAS, and all affected individuals carry the mutation. Haplotype analysis by using closely linked polymorphisms, including a previously unreported BfaI restriction fragment length polymorphism within the 3’-UTR of the elastin gene, indicates that the mutations found …
High Levels Of Loss At The 17p Telomere Suggest The Close Proximity Of A Tumour Suppressor, Helen Donis-Keller, G White, M Stack, M Santibáñez-Koref, D Liscia, T Venesio, Jen Wang, C Helms, D Betticher, H Altermatt, P Hoban, J Heighway
High Levels Of Loss At The 17p Telomere Suggest The Close Proximity Of A Tumour Suppressor, Helen Donis-Keller, G White, M Stack, M Santibáñez-Koref, D Liscia, T Venesio, Jen Wang, C Helms, D Betticher, H Altermatt, P Hoban, J Heighway
Helen Donis-Keller
High levels of loss of distal markers on 17p13.3 in breast cancer suggested the presence within the region of at least one tumour-suppressor gene. Here we describe the derivation of two biallelic polymorphisms from the 17p telomeric yeast artificial chromosome (YAC) TYAC98. Polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) and multiplex PCR analysis demonstrated that the high level of allelic imbalance observed in breast tumours represented loss of constitutional heterozygosity (LOH) and that this LOH extended to the telomere. Lung carcinoma (but not Wilms' tumour)-derived DNA again revealed a high level of loss of subtelomeric 17p sequences. Telomeric microsatellite polymorphisms …
Genetic Fine Mapping Of The Gene For Nonsyndromic Congenital Retinal Nonattachment., Helen Donis-Keller, N Ghiasvand, T Fleming, C Helms, Aledavood Avisa
Genetic Fine Mapping Of The Gene For Nonsyndromic Congenital Retinal Nonattachment., Helen Donis-Keller, N Ghiasvand, T Fleming, C Helms, Aledavood Avisa
Helen Donis-Keller
Autosomal recessive nonsyndromic congenital retinal nonattachment (NCRNA) comprises congenital insensitivity to light, massive retrolental mass, shallow anterior chamber, microphthalmia, and nystagmus in otherwise normal individuals. Polymerase chain reaction-based linkage analyses of polymorphic microsatellite markers in the 10q21 region on DNA samples from 106 individuals provide evidence that the NCRNA locus is within an interval of ∼0.6–1.5 cM, flanked by the markers D10S522 and D10S1418. Haplotype analysis demonstrated a unique founder haplotype shared by 100% of the NCRNA chromosomes. These results indicate a founder effect and the strong possibility of a single mutation as the cause of the disease in the …
Mapping Human Telomere Regions With Yac And P1 Clones: Chromosome-Specific Markers For 27 Telomeres Including 149 Stss And 24 Polymorphisms For 14 Proterminal Regions, Helen Donis-Keller, A Vocero-Akbani, C Helms, Jen Wang, F Sanjurjo, J Korte-Sarfaty, Rosalie Veile, L Liu, A Jauch, A Burgess, A Hing, Matthew Holt, S Ramachandra, A Whelan, R Anker, L Ahrent, M Chen, M Gavin, K Iannantuoni, S Morton, Sunil Pandit, C Read, Todd Steinbrueck, Christopher Warlick, D Smoller
Mapping Human Telomere Regions With Yac And P1 Clones: Chromosome-Specific Markers For 27 Telomeres Including 149 Stss And 24 Polymorphisms For 14 Proterminal Regions, Helen Donis-Keller, A Vocero-Akbani, C Helms, Jen Wang, F Sanjurjo, J Korte-Sarfaty, Rosalie Veile, L Liu, A Jauch, A Burgess, A Hing, Matthew Holt, S Ramachandra, A Whelan, R Anker, L Ahrent, M Chen, M Gavin, K Iannantuoni, S Morton, Sunil Pandit, C Read, Todd Steinbrueck, Christopher Warlick, D Smoller
Helen Donis-Keller
A YAC library enriched for telomere clones was constructed and screened for the humantelomere-specific repeat sequence (TTAGGG). Altogether 196 TYAC library clones were studied: 189 new TYAC clones were isolated, 149 STSs were developed for 132 different TY-ACs, and 39P1 clones were identified using 19 STSs from 16 of the TYACs. A combination of mappingmethods including fluorescence in situ hybridization, somatic cell hybrid panels, clamped homogeneous electric fields, meiotic linkage, and BLASTN sequence analysis was utilized to characterize the resource. Forty-five of the TYACs map to 31 specific telomere regions. Twenty-four linkage markers were developed and mapped within 14 proterminal …
Subregional Localization Of 21 Chromosome 7-Specific Expressed Sequence Tags (Ests) By Fish Using Newly Identified Yacs And P1s, Helen Donis-Keller, S Morton, Rosalie Veile, Cynthia Helms, Martin Lee, Wen-Lin Kuo, Joe Gray
Subregional Localization Of 21 Chromosome 7-Specific Expressed Sequence Tags (Ests) By Fish Using Newly Identified Yacs And P1s, Helen Donis-Keller, S Morton, Rosalie Veile, Cynthia Helms, Martin Lee, Wen-Lin Kuo, Joe Gray
Helen Donis-Keller
Twenty-one putative chromosome 7-derived expressed sequence tags (ESTs) identified 33 yeast artificial chromosomes (YACs) or P1 clones, which were then used as reagents for physical mapping. FISH mapping established that the ESTs contained within these clones were distributed throughout chromosome 7, with all major cytogenetic bands represented, except 7p13–p15, 7p11, 7q31.2, and 7q35. Each EST sequence identified at least one other sequence in publicly available databases (using search tools such as BLASTN, basic local alignment search tool), and many of the ESTs identified cDNAs and several genomic DNA sequences. However, 7 ESTs did not identify highly significant matches (P< 1 …
The Finding Of A Somatic Deletion In Ret Exon 15 Clarified The Sporadic Nature Of A Medullary Thyroid Carcinoma Suspected To Be Familial, Helen Donis-Keller, J Oriola, I Halperin, F Rivera-Fillat
The Finding Of A Somatic Deletion In Ret Exon 15 Clarified The Sporadic Nature Of A Medullary Thyroid Carcinoma Suspected To Be Familial, Helen Donis-Keller, J Oriola, I Halperin, F Rivera-Fillat
Helen Donis-Keller
Medullary thyroid carcinoma (MTC) occurs both sporadically and in the autosomal dominantly inherited multiple endocrine neoplasia (MEN) type 2 syndromes. The distinction between both is important for future clinical management. We report a family initially described as a familial MTC by pentagastrin stimulation test and clinical outcome, in which we found a 12 bp deletion within the catalytic domain of the protooncogene RET in the index case tumor alone. Linkage study suggests that it is a sporadic MTC. Therefore, in view of these results, in kindred with just one MTC case, borderline pentagastrin test values must be carefully assessed. In …
The Multiple Endocrine Neoplasia Type 2b Point Mutation Alters Long-Term Regulation And Enhances The Transforming Capacity Of The Epidermal Growth Factor Receptor, Helen Donis-Keller, Sunil Pandit, Takeo Iwamoto, John Tomich, Linda Pike
The Multiple Endocrine Neoplasia Type 2b Point Mutation Alters Long-Term Regulation And Enhances The Transforming Capacity Of The Epidermal Growth Factor Receptor, Helen Donis-Keller, Sunil Pandit, Takeo Iwamoto, John Tomich, Linda Pike
Helen Donis-Keller
The RET proto-oncogene encodes a member of the receptor tyrosine kinase family. Multiple endocrine neoplasia type 2B (MEN 2B) is caused by the mutation of a conserved methionine to a threonine in the catalytic domain of the RET kinase. When the MEN 2B point mutation was introduced into the epidermal growth factor (EGF) receptor (M857T EGFR), the intrinsic tyrosine kinase activity of the mutant receptor was similar to that of wild-type EGF receptor and remained ligand-dependent. However, the mutant receptor showed an enhanced transforming capacitycompared to the wild-type receptor as judged by its ability to mediate the growth of NIH …
Index, Comprehensive Microsatellite, And Unified Linkage Maps Of Human Chromosome 14 With Cytogenetic Tie Points And A Telomere Microsatellite Marker, Helen Donis-Keller, Sunil Pandit, Jen Wang, Rosalie Veile, Santosh Mishra, Christopher Warlick
Index, Comprehensive Microsatellite, And Unified Linkage Maps Of Human Chromosome 14 With Cytogenetic Tie Points And A Telomere Microsatellite Marker, Helen Donis-Keller, Sunil Pandit, Jen Wang, Rosalie Veile, Santosh Mishra, Christopher Warlick
Helen Donis-Keller
Three sets of linkage maps (index, comprehensive microsatellite, and unified) have been constructed for human chromosome 14 based on genotypes from the CEPH reference pedigrees. The index maps consist of 18 microsatellite markers, with heterozygosities of at least 68% and intermarker spacing no greater than 11 cM. The sex-average comprehensive microsatellite map is 125 cM in length and includes 115 markers with 54 loci uniquely placed with odds for marker order of at least 1000:1. The sex-average index map length is 121 cM, and the female- and male-specificmaps are 143 and 101 cM, respectively. A unified map was also constructed …
The Cooperative Breast Cancer Tissue Resource: Archival Tissue For The Investigation Of Tumor Markers, Helen Donis-Keller, Andrew Glass, Carolyn Mies, Jose Russo, Barbara Zehnbauer, Sheila Taube, Roger Aamodt
The Cooperative Breast Cancer Tissue Resource: Archival Tissue For The Investigation Of Tumor Markers, Helen Donis-Keller, Andrew Glass, Carolyn Mies, Jose Russo, Barbara Zehnbauer, Sheila Taube, Roger Aamodt
Helen Donis-Keller
Investigators continue to search for reliable markers of prognosis of breast cancer. For many analyses, laboratory techniques permit the use of archival paraffin-embedded tissue collected years previously and readily linked to clinical and follow-up information. Laboratory investigators have often expressed the need for such a tissue resource. We have developed a publicly availableresource of archival breast cancer specimens. The pathological material has been collected and reviewed by investigators at four institutions and currently includes breast cancer specimens from more than 9300 cases. Institutional pathologists reviewed slides and blocks using a common protocol and coding scheme. Clinical information and details of …
The Ceph Consortium Linkage Map Of Human Chromosome 11, M Litt, P Kramer, E. Kort, P Fain, S Cox, D Root, R White, J Weissenbach, Helen Donis-Keller, R Gatti, J Weber, Y Nakamura, C Julier, K Hayashi, N Spurr, M Dean, J Mandel, K Kidd, T Kruse, A Retief, A Bale, T Meo, G Vergnaud, S Warren, H Willard
The Ceph Consortium Linkage Map Of Human Chromosome 11, M Litt, P Kramer, E. Kort, P Fain, S Cox, D Root, R White, J Weissenbach, Helen Donis-Keller, R Gatti, J Weber, Y Nakamura, C Julier, K Hayashi, N Spurr, M Dean, J Mandel, K Kidd, T Kruse, A Retief, A Bale, T Meo, G Vergnaud, S Warren, H Willard
Helen Donis-Keller
The CEPH consortium framework map of chromosome 11 is presented. The map was generated from CEPH family DNAs with 181 probe/enzyme combinations contributed by 20 laboratories. Seventy-seven of the loci are defined by microsatellite polymorphisms that can be typed by the PCR. A total of 42 loci have been placed on the map with likelihood support of at least 1000:1. The female, male, and sex-average maps extend for 179.6, 110.8, and 145.3 cM, respectively. The largest interval on the sex-average map is less than 11 cM, and the average distance between uniquely placed loci is 4 cM. The genotypic data …