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PLos ONE 7, e47892. Epigenetic disruption of the PIWI pathway in human spermatogenic disorders. 2012

Heyn, H., Ferreira, H.J., Bassas, L., Bonache, S., Sayols, S., Sandoval, J., Esteller, M. and Larriba, S.

Notes: The authors used microarray analysis, bisulfite sequencing and pyrosequencing to examine a possible link between aberrant DNA methylation and abnormal human spermatogenesis and male infertility. They identified almost 600 genes that were differentially methylated in testis tissue of men with secretory male infertility. Genomic DNA used in the microarray analysis was extracted from testicular biopsies using the Wizard® Genomic DNA Purification Kit. For the bisulfite sequencing experiments, genomic DNA was bisulfite-modified, amplified, cloned using the pGEM®-T Easy Vector System, then sequenced. (4257)

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Appl. Environ. Microbiol. 78, 445–54. Responses of methanogen mcrA genes and their transcripts to an alternate dry/wet cycle of paddy field soil. 2012

Ma, K., Conrad, R. and Lu, Y.

Notes: The authors of this study investigated the microbial mechanisms associated with the reduction of methane production and emission from rice fields observed with intermittent field drainage. They looked in particular at the abundance of mcrA gene copies and transcripts from rice paddy soil fauna. The mcrA gene encodes the alpha subunit of methyl coenzyme M reductase. 

Total nucleic acid was extracted from soil samples using a phenol-chloroform procedure. For RNA analyses, DNA was hydrolyzed using RQ1 RNase-free DNase in the presence of 0.2µl Recombinant RNasin® Ribonuclease Inhibitor and then further purified using a commercial kit. cDNA synthesis was carried out using the Improm-II™ Reverse Transcription System, again in the presence of 1.0µl Recombinant RNasin® Ribonuclease Inhibitor. A clone library of transcripts was generated using the pGEM®-T Easy Vector System. The transcript standard for quantitative mcrA analysis was prepared from the in vitro transcript of a mcrA clone using the Riboprobe® in vitro Transcription Systems. (4241)

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J. Biol. Chem. 286, 37196–206. 5-Aza-2'-deoxycytidine activates iron uptake and heme biosynthesis by increasing c-myc nuclear localization and binding to the e-boxes of transferrin receptor 1 (TfR1) and ferrochelatase (Fech) genes. 2011

Ning, B., Liu., G., Liu, Y., Su, X., Anderson, G.J., Zheng, X., Chang, Y., Guo, M., Liu, Y., Zhao, Y. and Nie, G.

Notes: The authors used GoTaq® DNA Polymerase to amplify cDNA generated from total RNA (RT-PCR) extracted from murine erythroid leukemia (MEL) cells and mouse erythroid burst-forming units (BFU-Es). These cells were used to study the molecular mechanism of 5-aza-2'-deoxycytidine (5-aza-CdR)-induced erythroid differentiation, a process involved in azanucleotides for treating myelodysplastic syndromes (MDS) that reduces the risk of transformation to acute myeloid leukemia (AML). Treatment of these cells with 5-aza-CdR, a hypomethylation reagent, upregulated genes responsible for heme production and iron uptake. The pGL3 basic vector and promoter were used to create plasmid constructs of different E-box regulatory sequences with a luciferase reporter. The plasmids were cotransfected with c-Myc, Max or both transcription factors into human hepatocytes (HepG2). The Dual-Luciferase® Reporter Assay System was used to identify that the –6kb E-box of the transferrin receptor 1 (TfR1) promoter was a strong enhancer for inducing TfR1 expression when c-Myc and Max formed functional complexes that bound to it. Bisulfite sequencing was performed to study methylation patterns after 5-aza-2’-CdR treatment using the pGEM-T® Easy Vector system to ligate the isolated DNA fragments for TfR1 and Fech (ferrochetalase), which were transformed into E coli. for final sequencing. (4176)

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Appl. Environ. Microbiol. 77, 2113–21. General suppression of Escherichia coli O157:H7 in sand-based dairy livestock bedding. 2011

Westphal, A., Williams, M.L., Baysal-Gurel, F., LeJeune, J.T. and McSpadden Gardener, B.B.

Notes: The authors investigated the suppression of E. coli O157:H7 in sand-based livestock bedding and hypothesized that suppression of E. coli O157:H7 growth was mediated by an environmentally stable population of pathogen-suppressing bacteria. These bacteria were identified by terminal restriction fragment length polymorphism (T-RFLP) analysis of amplified 16S rRNA gene sequences isolated from used bedding followed by cloning and sequencing of the most abundant terminal restriction fragments. Amplifications were performed using the GoTaq® Flexi DNA Polymerase, then PCR products were cloned into the pGEM®-T Easy Vector. The PureYield™ Plasmid Miniprep System was used to purify plasmids for sequencing. (4165)

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Biochem. J. 436, 387–397. The novel Nrf2-interacting factor KAP1 regulates susceptibility to oxidative stress by promoting the Nrf2-mediated cytoprotective response. 2011

Maruyama, A., Nishikawa, K., Kawatani, Y., Mimura, J., Hosoya, T., Harada, N., Yamamato, M. and Itoh, K.

Notes: These authors first used a FLAG-tagged protein (nfr2) with a HeLa Nuclear extract and captured interacting proteins via SDS-PAGE and in-gel digests of bands to identify (Krüppel-associated box)-associated protein 1 (KAP1) as a potential interacting partner. Human KAP1 was purchased as a HaloTag® CMV Flexi® Vector from Kazusa and used in a Mammalian PullDown scenario (with HaloLink™ Resin) to demonstrate interaction between the two proteins. A reporter assay was used to show that KAP1 facilitates Nrf2 transactivation in a dose-dependent manner. The authors defined the interaction sites using GST-tagged nrf2 and various forms of KAP1-HaloTag® Fusions expressed in TNT® SP6 High-Yield Wheat Germ Extract. GST-tagged proteins were expressed in E. coli and bound to glutathione-Sepharose beads. These bound proteins were mixed with the KAP1 from the cell-free expression system, incubated for 4 hours at 4°C, washed and stained with the HaloTag® TMR Ligand for 30 minutes. The proteins from the pull-down assay were subjected to SDS-PAGE and the HaloTag® proteins detected by phosphorimaging and the GST proteins by Coomassie Brilliant Blue Staining. A two-hybrid system consisting of the pRL-TK Vector with a firefly luciferase reporter with Gal4 UAS, mouse Nrf-2 N-terminal domain and KAP1 was also used. The vectors were transfected into Nrf2 knockout MEFs for 4 hours then incubated for 36 hours before luciferase expression was determined using the Dual-Luciferase® Reporter Assay System. (4123)

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J. Biol. Chem. 286, 19478–19488. Thrombomodulin is silenced in malignant mesothelioma by a poly(ADP-ribose) polymerase-1-mediated epigenetic mechanism. 2011

Nocchi, L., Tomasetti, M., Amati, M., Neuzil, J., Santarelli, L. and Saccucci, F.

Notes: Thrombomodulin (TM) expression was examined by isolating genomic DNA from biopies of human malignant mesothelioma and normal mesothelial tissue, and cultured cell lines with or without PARP1 silencing treated with 5-aza-2´-deoxycytidine and trichostatin alone or in combination and then subjected to biosulfide modification. To analyze methylation of TM, a CpG island in the promoter, 5´ UTR and an exon region containing 44 CpG dinucleotides were PCR amplified, cloned into the pGEM®-T Easy Vector, transformed and positive clones selected using IPTG/X-Gal and analyzed by PCR. Colonies were cultured, the plasmids isolated using the Wizard® Plus SV Minipreps DNA Purification System then 10 clones
from each sample type were sequenced. (4132)

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Appl. Environ. Microbiol. 75, 2275–83. Characterization of regulatory pathways in Xylella fastidiosa: genes and phenotypes controlled by gacA. 2009

Shi, X.Y., Dumenyo, C.K., Hernandez-Martinez, R., Azad, H. and Cooksey, D.A.

Notes: To gain a better understanding of how Xylella fastidiosa causes diseases in grapes, the authors mutated conserved regulatory genes, including gacA, that affect expression of virulence-related factors in other species. The relative expression levels of gacA in wildtype and mutated strains were examined using RT-PCR. The authors also identified and quantified a number of genes that were regulated by GacA by microarray analysis. Microarray results were confirmed using RT-PCR. RT-PCR was performed using the AccessQuick™ RT-PCR System. (4052)

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J. Bacteriol. 190, 1912–21. Borrelia burgdorferi uniquely regulates its motility genes and has an intricate flagellar hook-basal body structure. 2008

Sal, M.S., Li, C., Motalab, M.A., Shibata, S., Aizawa, S. and Charon, N.W.

Notes: The authors investigated gene transcription within periplasmic flagella of Borrelia burgdorferi, which are composed of a basal body, hook and filament, to determine if hook formation influences flagellin gene expression. They used insertion mutagenesis to construct strains with mutated versions of the hook structural gene flgE that were disrupted by a kanamycin-resistance cassette. The flgE gene and antibiotic-resistance cassette were amplified by PCR and cloned into the pGEM®-T Vector. To assess the effect of flgE disruption on the transcription of filament proteins FlaA and FlaB, quantitative RT-PCR was performed; enolase was used as an internal control. Negative controls without the reverse transcriptase were included for each sample. (3885)

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Proc. Natl. Acad. Sci. USA 105, 8914-8919. An epoxide hydrolase involved in the biosynthesis of an insect sex attractant and its use to localize the production site. 2008

Abdel-Latief, M., Garbe, L.A., Koch, M., and Ruther, J.

Notes: These authors amplified and characterized a putative epoxide hydrolase gene from the jewel wasp Nasonia vitripennis. PCR fragments were amplified from genomic DNA, purified from gels using the Wizard® SV Gel and PCR Clean Up System and then subcloned into the pGEM®-T Easy Vector. The plasmid DNA was purified using the PureYield™ Midiprep System. Linearized plasmids were used for in vitro transcription of RNA for use in RNA interference experiments. (3903)

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Antimicrob. Agents Chemother. 52, 1812–9. Enhanced resistance to bacterial infection in protegrin-1 transgenic mice. 2008

Cheung, Q.C., Turner, P.V., Song, C., Wu, D., Cai, H.Y., MacInnes, J.I. and Li, J.

Notes: One potential source of antibiotic-resistant bacteria is food-producing animals. The authors examined the ability of protegrin-1 (PG-1), an antimicrobial peptide, to protect wildtype and transgenic mice expressing PG-1 against bacterial infection. As part of the cloning strategy to produce the PG-1 expression construct, the authors amplified and cloned full-length PG-1 into the pGEM®-T Easy Vector. To test the bactericidal activity of PG-1 expressed in transgenic mice, radial diffusion assays were performed, in which test samples were added to a well containing E. coli and the clear antibacterial zone was measured. Two of the test samples were neutrophil secretions from the PG-1 transgenic mice and purified polyhistidine-tagged PG-1 protein, purified using the MagneHis™ Protein Purification System. (3896)

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Microbiology 154, 139–47. Involvement of BmoR and BmoG in n-alkane metabolism in 'Pseudomonas butanovora'. 2008

Kurth, E.G., Doughty, D.M., Bottomley, P.J., Arp, D.J. and Sayavedra-Soto, L.A.

Notes: The authors characterized five open-reading frames flanking the alcohol-inducible alkane monooxygenase (BMO) structural gene of Pseudomonas butanovora. Strains with mutated bmoR, which encodes a putative transcriptional regulator, or bmoG, which encodes a putative chaperonin, were created by gene inactivation. The bmoR gene was amplified and cloned into the pGEM®-T Vector for disruption with a kanamycin cassette. The two termini of the bmoG gene were amplified separately, ligated to the kanamycin cassette and cloned into the pGEM®-T Easy Vector. Plasmids encoding the disrupted genes were transformed into Pseudomonas butanovora by electroporation. (3893)

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Nucl. Acids Res. 36, 2107–2722. PDZ domain-mediated dimerization and homeodomain-directed specificity are required for high-affinity DNA binding by SATB1. 2008

Purbey, P.K., Singh, S., Kumar, P.P., Mehta, S., Ganesh, K.N., Mitra, D. and Galande, S.

Notes: To learn about the ideal target binding sequence for SATB1, the T-lineage-enriched chromatin organizer and transcription factor, random oligonucleotides underwent SELEX and five rounds of selection by EMSA. The enriched library of oligos was cloned into the pGEM®-T Easy Vector, transformed and sequenced. Several variants of SATB1-binding consensus sequences were annealed, ligated into the pGL3-Promoter Vector and cotransfected into HEK 293 cells with a plasmid that either contained SATB1 or was empty. After 48 hours, the cells were harvested and luciferase activity measured. The CheckMate™ Mammalian Two-Hybrid System was used to assess how the N-terminal PDZ domain of SATB1 interacted with the Cut and homeodomain in the C-terminus. (3982)

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Clin. Vaccine Immunol. 15, 418–424. Sequential analysis of Anaplasma phagocytophilum msp2 transcription in murine and equine models of human. 2008

Scorpio, D.G., Leutenegger, C., Berger, J., Barat, N., Madigan, J.E. and Dumler, J.S.

Notes: The authors examined the pattern of Anaplasma phagocytophilum msp2 expression, a gene that modulates with little immune pressure and has decreased virulence with prolonged in vitro passage. C57BL/6J mice were inoculated with HL-60 cells infected with low-passage (passage 5) or high-passage (passage 26). Blood samples were taken 2–21 days post-inoculation, and total RNA was isolated. The purified RNA was subjected to RT-PCR, cloned into the pGEM®-T Easy Vector, transformed and plated. Plasmids were purified using the Wizard® SV 96 Plasmid DNA Purification System, and the insert size analyzed after EcoRI digestion. The inserts were sequenced, aligned with A. phagocytophilum Webster strain msp2 references using ClustalX and the diversity of msp2 transcripts divided into low- or high-passage bacteria. (3975)

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J. Virol. 12, 5940–50. Sulfatide is required for efficient replication of influenza A virus. 2008

Takahashi, T., Murakami, K., Nagakura, M., Kishita, H., Watanabe, S., Honke, K., Ogura, K., Tai, T., Kawasaki, K., Miyamoto, D., Hidari, K.I., Guo, C.T., Suzuki, Y. and Suzuki, T.

Notes: Sulfatide is present in mammalian organs where influenza A replicates. Ceramide galactosyltransferase (CGT) and cerebroside (galactosylceramide) sulfotransferase (CST), which synthesize sulfatide, were cloned by PCR into the pTargeT™ Mammalian Expression Vector and the pGEM®-T Easy Vector, (CST with or without a three base insertion), respectively. The two genes were removed by restriction digestion and cloned into pIRES-neo to forma bicistronic construct. Arylsulfatase A (ASA), which degrades sulfatide was also amplified and cloned into the pGEM®-T Easy Vector, before being subcloned into a neomycin-resistant expression vector. The expression vectors were transfected into COS-7 cells and selected for stable expression using G418. (3990)

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Appl. Environ. Microbiol. 74, 2288–97. The genomes of the non-clearing-zone-forming and natural-rubber-degrading species Gordonia polyisoprenivorans and Gordonia westfalica harbor genes expressing Lcp activity in Streptomyces strains. 2008

Bröker, D., Dietz, D., Arenskötter, M. and Steinbüchel, A.

Notes: Natural rubber-degrading bacteria fall into two categories: those forming clearing zones on latex overlay plates and those that do not. To investigate this degradation process, the authors amplified latex-clearing protein (lcp) homologs from non-clearing-zone-forming bacteria using degenerate PCR primers based on lcp sequences from clearing-zone forming species. The 3´ region of the lcp gene in G. westfalica was amplified by nested PCR using biotinylated primers, and the amplified products were cloned in the pGEM®-T Easy Vector and sequenced using universal M13 forward and reverse primers. (3907)

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Genetics 179, 177-192. The small ubiquitin-like modifier (SUMO) and SUMO-conjugating system of Chlamydomonas reinhardtii. 2008

Wang, Y., Ladunga, I., Miller, A.R., Horken, K.M., Plucinak, T., Weeks, D.P. and Bailey, C.P.

Notes: These authors used computational biology to screen the genome of the alga Chlamydomonas reinhardtii for SUMO (small ubiquitin-like modifier) homologs. They identified several SUMO and SUMO-like sequences. One of these proteins, crSUMO96, which was recognized by the A. thaliana anti-SUMO antibody, was studied in detail. During their studies, the authors used the PureYield™ RNA Midiprep System to isolate total RNA from C. reinhardtii cells. This RNA was used in real-time RT-RCR assays to detect mRNA transcripts for the various SUMO-like proteins. The Plexor® Two-Step qRT-PCR System was used for the real-time assays. For expression studies, cDNA encoding the various proteins was amplified and subcloned into the pGEM®-T Easy Vector before transfer into an expression vector. (3875)

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J. Biol. Chem. 282, 29211–21. A novel CaV1.2 N terminus expressed in smooth muscle cells of resistance size arteries modifies channel regulation by auxiliary subunits. 2007

Cheng, X., Liu, J., Asuncion-Chin, M., Blaskova, E., Bannister, J.P., Dopico, A.M. and Jaggar, J.H.

Notes: The authors identified a novel subunit of the voltage-dependent L-type Ca2+ channel (CaV1.2) with a cysteine-rich N-terminus using rapid amplification of cDNA ends (5´ RACE). The 5´ RACE products were amplified using nested PCR, then cloned into the pGEM®-T Easy Vector and sequenced using the T7 Promoter Primer. (3801)

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J. Mol. Endocrinol. 36, 449–461. Human chorionic gonadotropin-dependent induction of an equine aldo-keto reductase (AKR1C23) with 20alpha-hydroxysteroid dehydrogenase activity during follicular luteinization in vivo. 2007

Brown, K.A., Boerboom, D., Bouchard, N., Doré, M., Lussier, J.G. and Sirois, J.

Notes: The authors cloned the novel equine aldo-keto reductase AKR1C23 and characterized its expression patterns in the preovulatory follicle. The AKR1C23 cDNA was amplified from equine ovarian RNA using the Access RT-PCR System and primers designed by sequence alignments of known AKR sequences, then cloned into the pGEM®-T Easy Vector. Levels of AKR1C23 and ribosomal protein L17a mRNAs in various equine tissues were quantified using the Access RT-PCR System and 21 cycles and 18 cycles, respectively, followed by agarose gel electrophoresis, transfer to nylon membranes, and hybridization to radiolabeled probes synthesized using the Prime-a-Gene® Labeling System. (3791)

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Mol. Cell. Biol. 26, 8448–8460. Specific isoforms of translation initiation factor 4GI show differences in translational activity. 2007

Coldwell, M.J. and Morley, S.J.

Notes: The authors explored the role of five different eukaryotic initiation factor (eIF) 4GI protein isoforms, which are encoded by alternatively spliced mRNAs, by using short interfering RNAs (siRNAs) to silence the eIF4GI gene. Three eIF4GI siRNA target sequences were evaluated for their ability to reduce eIF4GI mRNA levels in HeLa cells. To quantify the extent of gene silencing, a control plasmid that encodes an eIF4GI/Renilla luciferase fusion mRNA was created using the psiCHECK™-2 Vector. Cotransfection of HeLa cells with the eIF4GI siRNAs and psiCHECK™-2 control plasmid resulted in degradation of the eIF4GI/Renilla luciferase mRNA, leading to reduced Renilla luciferase activity and lower light output. The psiCHECK™-2 Vector encodes the firefly luciferase gene, which allowed normalization of Renilla luciferase expression. Firefly and Renilla luciferase activities were measured using the Dual-Luciferase® Reporter Assay System. Quantitative PCR (qPCR) was used to quantify the silencing of endogenous eIF4GI mRNA splice variants. Prior to qPCR, total RNA was isolated from siRNA-expressing HeLa cells, then reverse transcribed using the ImProm-II™ Reverse Transcription System. qPCR was The pGEM®-T Easy Vector was used in the creation of plasmids encoding siRNA-resistant eIF4GI isoforms, which were transfected into siRNA-expressing HeLa cells to restore eIF4GI function. (3778)

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J. Androl. 27, 240-247. Aging and the Brown Norway Rat Leydig Cel Antioxidant Defense System 2006

Luo, L., Chen, H., Trush, M.A., Show, M.D., Anway, M.D. and Zirkin, B.R.

Notes: Rat cDNA fragments of the genes encoding copper-zinc superoxide dismutase, manganese superoxide dismutase and glutathione peroxidase were amplified and cloned into the pGEM®-T Easy Vector. The clones were used to probe Northern blots to examine the effect of age on the expression of these antioxidant defense genes. (3632)

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Appl. Environ. Microbiol. 72, 6070-6078. An oxidoreductase is involved in cercosporin degradation by the bacterium Xanthomonas campestris pv. zinniae. 2006

Taylor, T.V., Mitchell, T.K. and Daub, M.E.

Notes: Fungi of the genus Cercospora are plant pathogens that cause leaf spot and blight diseases, and produce the polyketide toxin cercosporin. The bacterium Xanthomonas campestris is able to rapidly degrade cercosporin. In this study, X. campestris mutants unable to degrade cercosporin were created by chemical mutagenesis. Complementation studies with a plasmid-based library of X. campestris DNA showed that the ability to degrade cercosporin was restored upon transformation with plasmids containing an oxidoreductase gene and a putative transcriptional regulator. These genes were then amplified from the mutant strains by high-fidelity PCR. The PCR products were separated by agarose gel electrophoresis, purified using the Wizard® SV Gel and PCR Clean-Up System, and subcloned into the pGEM®-T Easy Vector. The mutant genes were then sequenced to identify the nature of the mutations. (3531)

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Appl. Environ. Microbiol. 72, 2539-2546. Cloning and sequencing of the ompA gene of Enterobacter sakazakii and development of an ompA-targeted PCR for rapid detection of Enterobacter sakazakii in infant formula. 2006

Mohan Nair, M.K. and Venkitanarayanan, K.S.

Notes: The outer membrane protein A (ompA) gene of Enterobacter sakazakii was amplified using PCR primers based on E. coli ompA sequences. The resulting PCR product was ligated into the pGEM®-T Easy Vector, and the sequence was confirmed. The ompA sequence was used to develop a PCR for detection of Enterobacter sakazakii in reconsituted infant formula. (3464)

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J. Exp. Bot. July, epub ahead of print. HaloTag™: A new versatile reporter gene system in plant cells. 2006

Lang, C., Schulze, J., Mendel, R-R. and Hänsch, R.

Notes: This paper highlights the first use of the HaloTag™ Interchangeable Protein Labeling Technology in plant cells. The cDNA for the HaloTag™ protein was amplified by PCR from the pHT2 Vector and cloned into the pGEM®-T Easy® Vector, from which it was excised and transferred to a second vector where its expression was under the control of the cauliflower mosaic virus (CaMV)-35S promoter. The construct was transformed into tobacco protoplasts and bioballistically transformed into tobacco leaf cells. Localization was followed using the HaloTag™ TMR and diAcFAM Ligands. (3503)

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Infect. Immun. 74, 3825-3833. Identification of novel virulence determinants in Mycobacterium paratuberculosis by screening a library of insertional mutants. 2006

Shin, S.J., Wu, C-W., Steinberg, H. and Talaat, A.M.

Notes: In this study, insertional mutagenesis with the transposon TN5367 was used to generate a library of M. paratuberculosis mutants. Sequences containing transposons were then amplified, gel purified using the Wizard® SV Gel and PCR Clean-Up System, and cloned into the pGEM®-T Easy Vector prior to sequencing. Bioinformatic screening was then used to identify potential virulence determinants for further study in a mouse model of M. paratuberculosis infection. (3534)

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J. Physiol. 570, 283-294. Motor neurone targeting of IGF-1 prevents specific force decline in ageing mouse muscle 2006

Payne, A.M., Zheng, Z., Messi, M.L., Milligan, C.E., González, E. and Delbono, O.

Notes: Overexpression of IGF-1 can delay or prevent aging problems in motor neurons and skeletal muscle. The authors of this paper were able to target IGF-1 to motor neurons using a fusion protein containing tetanus toxin fragment C (TTC). Motor neurons will bind, take up and transport the TTC fragment with no toxicity to the neurons. Full-length human IGF-1 cDNA was generated by PCR and inserted into the pGEM®-T Easy Vector. TTC amplified from Clostridium tetani CN655 genomic DNA was inserted into the vector. The new IFG-1-TTC insert was used for PCR to eventually produce the fusion protein for the studies. (3635)

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