ksierzputowska.com Research Title: Using novel TALEN technology to engineer precise mutations in the genome of D. melanogaster
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1 Research Title: Using novel TALEN technology to engineer precise mutations in the genome of D. melanogaster Research plan: Specific aims: 1. To successfully engineer transgenic Drosophila expressing TALENs (transcription activator-like effector nucleases), which has been accomplished only once before [3]. 2. To use the newly developed TALEN technology to precisely excise a short genomic sequence that was a product of a previously used genetic engineering technique, homologous recombination. 3. To sequence the various mutations induced by the engineered TALENs in the Drosophila genome to better understand the limitations of this new technology. 4. To create Drosophila in which homologous recombination may be used without a genetic byproduct. Background and significance: The Reenan laboratory pioneered the use of homologous recombination (HR) in Drosophila, a tool for precisely engineering in vivo genetic mutations (Fig. 1). This technique allows for genome manipulation with surgical precision and produces a single by-product in the form of a short sequence known as the LoxP site [1]. Research carried out by Leila Rieder, a fifth-year graduate student in the lab, focuses on post-transcriptional processing in the paralytic gene, which encodes a sodium channel. Using HR to modify the paralytic gene, she discovered that the LoxP site, previously believed to be inert, causes the transcript structure to interfere with the activity of a specific RNA helicase (Maleless, or Mle). The LoxP site, a by-product of HR, is a short sequence capable of forming a perfect duplex secondary structure in the RNA through intramolecular base pairing (Fig. 2). This property enables the LoxP site to potentially disrupt any double-stranded RNA-dependent molecular machinery, such as the Mle helicase. Disproving the belief that the loxp site is inert, we discovered that loxp interferes with the molecular phenotype observed when we add in the Mle helicase. By targeting the LoxP site with TALENs, our goal is to disrupt, or possibly completely remove, this sequence from the endogenous locus. This would allow us to use the homologous recombination technique in the future without genetic byproduct, remove the LoxP interference with the Mle helicase in previously-engineered animals, and further demonstrate the utility of TALENs in the flexible genetic model organism Drosophila. Just last year, Miller et al [2] demonstrated the use of TALENs to excise small, targeted pieces of the genome in human cells. Very recently Liu et al [3] showed that this technology can be used easily, quickly, and effectively in Drosophila. We intend to use this novel approach to excise the LoxP site from transgenic flies that were the product of HR. Successful manipulation of the LoxP site through TALENs would provide any scientist using homologous recombination in the future with a method for removing the LoxP byproduct. As we will sequence the TALEN-induced mutations, our findings regarding TALEN specificity and precision in large sequence excision will benefit Drosophilists looking to explore this technology and others who choose to use TALENs in whole organisms.
2 Preliminary Studies: Cre recombinase is an endonuclease that recognizes and cuts specifically at LoxP sites. In theory, crossing a fly whose genome contains the LoxP site to a fly expressing the Cre enzyme would cause the enzyme to cleave the LoxP site, causing a double-stranded break in the DNA, and triggering one of the DNA repair pathways. Repair of the broken strand off of a wild-type chromosome could produce a recombinant fly that has replaced part of the LoxP site with a wild-type sequence. Our original approach, which crossed transgenic flies homozygous for the LoxP site to flies expressing Cre, produced flies with unknown genotypes in the region of the LoxP. By developing a sensitive and efficient screening assay, I genotyped these animals to determine whether a recombination event occurred (Fig. 3). I screened over 500 flies and had no success in disrupting the LoxP site. Little success in big numbers caused me to search for an alternate method of removing the LoxP site. TALENs proved to be useful in excising small sequences of target DNA from the genome of various model systems such as yeast [4] and human cells [2]. The only publication to date using TALEN technology in Drosophila demonstrated the efficacy of TALENs at creating small modifications to the genome, the largest being a 12 base-pair deletion [3]. Our proposed use of the TALEN technology to excise a sequence triple in size of those documented [3] is so far novel in concept and. To date, no data has been published on a deliberate, complete excision of a sequence within a genome. Our proposed project will not only be highly publishable in this aspect, but will also enable us to report on the limitations and precision of this technology in a living organism. Research Design and Methods: The TALEN technology is unparalleled in the simplicity and manipulability of its targeting mechanism. Each TALE repeat recognizes a single base pair in a DNA sequence, therefore assembly of TALE repeats can be engineered to bind any DNA sequence (Fig. 4). Fusing TALEs to an endonuclease allows for targeted DNA cleavage [2, 5]. Cermak et al [4] present a method for assembling custom TALENs in just 5 days using the Golden Gate TALEN and TAL effector kit (available through AddGene). We intend to follow the detailed protocol and software provided by Cermak et al [4] to design the sequences for the TALENs. Then we will make use of the protocol by Liu et al (the only Drosophila protocol available to date) for plasmid creation and steps following construct injection into syncytial embryos. As our laboratory is not equipped to inject plasmids into fly embryos, we will use the P-element injection service offered by Genetic Services, Inc., which we have used in the past, with much success. Now having flies that express the TALENs, which in itself is currently new and publishable, we will cross them into the flies produced by HR whose genomes contain the LoxP site, and then use the genetic screening technique described previously to look for disruptions in the LoxP. Based on numbers reported by Liu et al [3], we expect to see modifications in 17.2%-66.7% of injected embryos. Once animals with LoxP mutations are identified, their genomes will be sequenced to determine the extent of modification achieved via TALENs. This will provide us with a clear report on the extent of excision, and therefore the precision of TALEN technology for the Drosophila/genetic engineering fields. Finally, we can use the HR/TALEN modified Drosophila with the Mle enzyme to look for interactions that are not impeded by the LoxP.
3 Based on numbers given by Liu et al, the entire process, from the design and creation of a TALEN, to its microinjection into the Drosophila embryo and finally the detection of gene modification can, in theory, be accomplished within three to six months, which makes it a perfect time frame for an undergraduate research cumulating in a senior thesis project. I have worked in the Reenan lab for three years and have gained skills in Drosophila husbandry, genetic manipulating and phenotypic screening. This project is ideally suited for me as an experienced undergraduate; it enables me to work independently under guided supervision of two mentors, Dr. Reenan and Leila Rieder. Sources: (1) Staber, C.J. et al. Perturbing A-to-I RNA editing using genetics and homologous recombination. Methods in Molecular Biology. 718, (2011). (2) Miller, J. et al. A TALE nuclease architecture for efficient genome editing. Nat. Biotechnol. 29, (2011). (3) Liu, J. et al. Efficient and specific modifications of the Drosophila genome by means of an easy TALEN strategy. JGG. 39, (2012). (4) Cermak, T. et al. Efficient design and assembly of custom TALEN and other TAL effector-based constructs for DNA targeting. Nuc. Acids Res. 39 (12), e82. (2011). (5) Boch, Jens. TALEs of genome targeting. Nat. Biotechnol. 29, (2011).
4 Figures Figure 1. The Basics of in vivo Homologous Recombination (adapted from Staber et al., 2011). (a)the targeting vector containing arms homologous to the gene of interest (yellow) is randomly integrated into the fly genome. (b)flp and I-SceI enzymes excise the homology arm region, which carries a selectable marker (red) flanked by two LoxP sites (green). Activation of a DNA repair pathway triggers recombination at the endogenous locus (white). (c)cre recombinase excises the sequence between the LoxP sites. (d)targeted locus post-cre with the selectable marker gene removed and the single LoxP byproduct. Figure 2. Predicted secondary structure of the LoxP sequence in the paralytic pre-mrna. The LoxP site (shown in gray) is capable of forming a perfect duplex secondary structure due to the presence of two inverted repeats. This structure may disrupt any double stranded RNA-dependent molecular machinery, such as RNA helicases.
5 Figure 3. Diagnostic assay using the PacI and SpeI restriction enzymes. Flies are screened for the disruption of the LoxP site using a double digest. DNA is extracted from 3 pooled flies, amplified via PCR, and then digested with PacI and SpeI and separated on EtBr-stained agarose gel. Lengths of bands correspond to the expected digestion pattern based on the fly genome. Lanes 1, 100 bp ladder, 2-4: controls in the form of a wild type fly (2), transgenic fly with the ECSΔ mutation (3), transgenic fly homozygous for LoxP (4). Lanes 5-7 recombinant flies with unknown genomes. Lanes 5 and 6 represent pooled flies with either the wild type, or the ECSΔ mutation. Lane 7 contains only ECSΔ flies. If a recombination event occurred to disrupt the LoxP, the digest would show 2 bands, which correspond to the ECSΔ mutation, and bands of bigger size than those of the LoxP, but smaller than pure wildtype. No such pattern was observed in 500 flies screened using this method. Figure 4. Assembled TALEN. The TALEN is assembled from the DNA-binding amino acid residues (Repeat Variable Diresidues) from TAL effectors (proteins secreted by plan pathogens) and the Fok1 endonuclease. RVDs make specific contacts with nucleotides one RVD corresponds to one base in the DNA, ex. yellow RVD corresponds to adenosine (A). This allows for assembly of custom TALE repeat arrays that will recognize any DNA sequence. The repeat domain is tethered to the Fok1 enzyme which, upon dimerization, cleaves DNA and therefore enables genome editing.
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