Adeno-associated virus (AAV) vectors, in particular serotype AAV9, are the most potent and promising vector types used for gene transfer into the heart. However AAV vectors also transduce non-target organs such as liver or skeletal muscle. Reduction of AAV-mediated transgene expression in non-target organs is an important aim to reduce or avoid unwanted side effects in gene therapy. The use of heart-specific promoters or the use of non-target organ specific microRNAs (miRNA) and its specific target site are approaches to control transgene transcription. E.g. the use of a miR-122 target site in the 3´UTR of an AAV9 vector leads to silencing of the transgene expression in the non-target organ liver (miR-122 is a liver-specific microRNA) (Geisler et al. 2011). <br><br> <strong>Technology</strong><br> We offer a mutated miR-206 target site (TS) as a control element for the si-lencing of unwanted transgene expression in the non-target organ skeletal muscle while allowing transgene expression in the target organ (e.g. heart). miR-206 is highly expressed in skeletal muscle and virtually absent in the heart. Unexpectedly, the expression of wild-type miR-206TS in the AAV9 transgene vector indeed exhibited reduced expression of the transgene in skeletal muscle however transgene expression was also silenced in the heart. This was due to the presence of miR-1 in the heart which shows 86% homology to miR-206. Thus miR-1 in the heart also binds to miR-206TS in the AAV9 vector which results in silencing of transgene expression in the heart. The use of specifically mutated miR-206TS overcomes this problem: miR-206 binds furthermore and even better to the mutated miR-206TS whereas miR-1 cannot bind the mutated miR-206TS. Hence, transgene expression is repressed in the skeletal muscle whereas it remains high in the heart.<br><br>
firstname.lastname@example.org | TechnologieAllianz e.V.
High-throughput screening system for directed evolution experiments using novel compartments
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Novel CVD-based growth process for zinc oxide layers
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Physicists of the University of Würzburg have made an astonishing discovery in a specific type of topological insulators. The effect is due to the structure of the materials used. The researchers have now published their work in the journal Science.
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In recent years, lasers with ultrashort pulses (USP) down to the femtosecond range have become established on an industrial scale. They could advance some applications with the much-lauded “cold ablation” – if that meant they would then achieve more throughput. A new generation of process engineering that will address this issue in particular will be discussed at the “4th UKP Workshop – Ultrafast Laser Technology” in April 2017.
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A multi-institutional research collaboration has created a novel approach for fabricating three-dimensional micro-optics through the shape-defined formation of porous silicon (PSi), with broad impacts in integrated optoelectronics, imaging, and photovoltaics.
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In experiments with magnetic atoms conducted at extremely low temperatures, scientists have demonstrated a unique phase of matter: The atoms form a new type of quantum liquid or quantum droplet state. These so called quantum droplets may preserve their form in absence of external confinement because of quantum effects. The joint team of experimental physicists from Innsbruck and theoretical physicists from Hannover report on their findings in the journal Physical Review X.
“Our Quantum droplets are in the gas phase but they still drop like a rock,” explains experimental physicist Francesca Ferlaino when talking about the...
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