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Tips from the Repository Trenches: Using Barcodes to Track Samples

Posted by Amanda Hazen on Oct 6, 2015 10:30:00 AM

Every plasmid sample enters Addgene the same way. A package is delivered by a mail courier and then the journey of transformation and storage begins. Some samples are submitted as bacterial colonies in petri dishes, but close to 80% of samples are received as DNA in a microcentrifuge tube. Once a sample enters Addgene’s lab, a series of events is triggered. Each step is tracked through barcoded tubes that are scanned into our Laboratory Information Management System (LIMS), a database we use to keep track of and manage all of the samples that come through our doors. It would be a nightmare if we didn’t have a simple way to track all of our 40,000 samples available for distribution!

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Topics: Inside Addgene, Lab Tips

Important Considerations in Optogenetics Behavioral Experiments

Posted by Guest Blogger on Oct 1, 2015 10:30:00 AM

This post is part of our Primer on Optogenetics and was contributed by guest blogger Derek Simon.

The actual experiments you do will be determined by the topic you’re interested in studying, but, in today’s post, we’ll discuss some of the important considerations you should think about when developing optogenetics behavioral experiments. There are far too many behaviors that have utilized optogenetics to be fully summarized in a short blog post, but some examples I’m personally interested in include: intracranial self-stimulation (ICSS) and place preference. The lab I work in (the Kreek lab) focuses on the neurobiology of addictive diseases, which means we are interested in circuits that mediate drug taking behavior. If a circuit reinforces behavior (activation of the circuit promotes subsequent, repeated activation), this is an approximation of reward or the sense of pleasure that the animal perceives through taking a drug. The ideal behaviors to test reinforcement are ICSS and place preference.

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Topics: Optogenetics, Lab Tips, Primer on Optogenetics

pSiM24: Simplifying Plant Genetic Engineering

Posted by Mary Gearing on Sep 29, 2015 10:30:00 AM

As previous blogs have noted, plants are an important foundation for life on Earth. Selective breeding methods have shaped the plants that we grow and eat, and genetic engineering will continue to improve plant nutrition, yield, and pest resistance. Much of plant genetic engineering revolves around Agrobacterium tumifaciens. Agrobacterium carries a “tumor-inducing” or Ti plasmid, which allows it to transfer genetic material into the host plant genome. Scientists have worked to optimize this system for gene transfer, studying the stability of modified Ti plasmids during plant infection, as well as plasmid yield during preparation in E. coli. Addgene depositor Indu Maiti has created a new and versatile binary Ti vector for both transient and stable gene expression applications in plants. This smaller, easily customizable vector functions in multiple species, including tobacco and Arabidopsis.

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Topics: Plasmid Technology, Plant Biology

CRISPR 101: Mammalian Expression Systems and Delivery Methods

Posted by Nicole Waxmonsky on Sep 24, 2015 10:30:00 AM

This post was updated on Dec 4, 2017.

CRISPR technology has been widely adopted for genome editing purposes because it's cheaper, faster, and easier than prior editing techniques. More and more CRISPR tools are being published each month, making CRISPR a great choice for your next experiment!

In this blog post we’ll provide an overview of some CRISPR mammalian expression systems, the typical applications for each, and potential delivery methods.

 

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Topics: Genome Engineering, CRISPR, CRISPR 101

New Tool for Lineage Tracing: The ClonTracer Library

Posted by Tyler Ford on Sep 22, 2015 10:30:00 AM

This article is based on an interview with Novartis researcher, Carrie Bhang.

The ClonTracer Library, deposited by Carrie Bhang, a research investigator in the In Vivo Pharmacology group at Novartis Oncology, is an exciting new tool that allows researchers to individually label millions of mammalian cells through lentiviral infection and to monitor their abundance and clonal dynamics over time using next generation sequencing (NGS). The library was developed when Carrie was a post-doc in Frank Stegmeier’s lab in Novartis Oncology. 

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Topics: Interview, Viral Vectors, pooled libraries, Cancer

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