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      Primer3Plus, an enhanced web interface to Primer3

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          Abstract

          Here we present Primer3Plus, a new web interface to the popular Primer3 primer design program as an enhanced alternative for the CGI- scripts that come with Primer3. Primer3 consists of a command line program and a web interface. The web interface is one large form showing all of the possible options. This makes the interface powerful, but at the same time confusing for occasional users. Primer3Plus provides an intuitive user interface using present-day web technologies and has been developed in close collaboration with molecular biologists and technicians regularly designing primers. It focuses on the task at hand, and hides detailed settings from the user until these are needed. We also added functionality to automate specific tasks like designing primers for cloning or step-wise sequencing. Settings and designed primer sequences can be stored locally for later use. Primer3Plus supports a range of common sequence formats, such as FASTA. Finally, primers selected by Primer3Plus can be sent to an order form, allowing tight integration into laboratory ordering systems. Moreover, the open architecture of Primer3Plus allows easy expansion or integration of external software packages. The Primer3Plus Perl source code is available under GPL license from SourceForge. Primer3Plus is available at http://www.bioinformatics.nl/primer3plus.

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          Predicting DNA duplex stability from the base sequence.

          We report the complete thermodynamic library of all 10 Watson-Crick DNA nearest-neighbor interactions. We obtained the relevant thermodynamic data from calorimetric studies on 19 DNA oligomers and 9 DNA polymers. We show how these thermodynamic data can be used to calculate the stability and predict the temperature-dependent behavior of any DNA duplex structure from knowledge of its base sequence. We illustrate our method of calculation by using the nearest-neighbor data to predict transition enthalpies and free energies for a series of DNA oligomers. These predicted values are in excellent agreement with the corresponding values determined experimentally. This agreement demonstrates that a DNA duplex structure thermodynamically can be considered to be the sum of its nearest-neighbor interactions. Armed with this knowledge and the nearest-neighbor thermodynamic data reported here, scientists now will be able to predict the stability (delta G degree) and the melting behavior (delta H degree) of any DNA duplex structure from inspection of its primary sequence. This capability should prove valuable in numerous applications, such as predicting the stability of a probe-gene complex; selecting optimal conditions for a hybridization experiment; deciding on the minimum length of a probe; predicting the influence of a specific transversion or transition on the stability of an affected DNA region; and predicting the relative stabilities of local domains within a DNA duplex.
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            The PCR suite.

            The web application PCR Suite is an extension of the primer design program Primer3. It allows the design of primer sets encompassing single nucleotide polymorphisms, all exons of a single gene, all open reading frames in a list of cDNAs or the creation of overlapping PCR products.
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              Osprey: a comprehensive tool employing novel methods for the design of oligonucleotides for DNA sequencing and microarrays.

              We have developed a software package called Osprey for the calculation of optimal oligonucleotides for DNA sequencing and the creation of microarrays based on either PCR-products or directly spotted oligomers. It incorporates a novel use of position-specific scoring matrices, for the sensitive and specific identification of secondary binding sites anywhere in the target sequence. Using accelerated hardware is faster and more efficient than the traditional pairwise alignments used in most oligo-design software. Osprey consists of a module for target site selection based on user input, novel utilities for dealing with problematic sequences such as repeats, and a common code base for the identification of optimal oligonucleotides from the target list. Overall, these improvements provide a program that, without major increases in run time, reflects current DNA thermodynamics models, improves specificity and reduces the user's data preprocessing and parameterization requirements. Using a TimeLogic hardware accelerator, we report up to 50-fold reduction in search time versus a linear search strategy. Target sites may be derived from computer analysis of DNA sequence assemblies in the case of sequencing efforts, or genome or EST analysis in the case of microarray development in both prokaryotes and eukaryotes.
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                Author and article information

                Journal
                Nucleic Acids Res
                Nucleic Acids Res
                nar
                nar
                Nucleic Acids Research
                Oxford University Press
                0305-1048
                1362-4962
                July 2007
                7 May 2007
                7 May 2007
                : 35
                : Web Server issue
                : W71-W74
                Affiliations
                1Laboratory of Molecular Biology and 2Laboratory of Bioinformatics, Department of Plant Science, Wageningen University, Dreijenlaan 3, 6703HA, Wageningen, The Netherlands
                Author notes
                *To whom correspondente should be addressed. +31 317 482037+31 317 483584 andreas@ 123456untergasser.de

                The authors wish it to be known that, in their option, the first two authors should be regarded as joint First Authors

                Article
                10.1093/nar/gkm306
                1933133
                17485472
                fd01bbaf-6325-42df-b81d-657e1aa5bfff
                © 2007 The Author(s)

                This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( http://creativecommons.org/licenses/by-nc/2.0/uk/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

                History
                : 31 January 2007
                : 2 April 2007
                : 4 April 2007
                Categories
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                Genetics
                Genetics

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