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PerlPrimer 1.1.21 is a free, open-source GUI application authored by Owen Marshall that automates the design of oligonucleotide primers for standard PCR, bisulphite PCR, real-time PCR (QPCR), and sequencing workflows. Written entirely in Perl with a Perl/Tk interface, the program retrieves genomic or cDNA sequences directly from Ensembl, automatically supplies both exonic and intronic templates for QPCR, and predicts primer-dimer formation, ORFs, and CpG islands. Melting temperatures are calculated with J. SantaLucia’s nearest-neighbour thermodynamic parameters and adjusted for user-defined Mg²⁺, dNTP, and primer concentrations via the von Ahsen correction, yielding high-specificity predictions that maximize product yield. Primers can be BLAST-searched against NCBI or a local database, augmented with in-frame cloning tails, and exported in tab-delimited spreadsheet-compatible format. For QPCR assays the software invokes NCBI’s Spidey executable to locate intron–exon boundaries without manual entry, while built-in restriction enzyme maps assist downstream cloning decisions. Supplied as a single cross-platform release (version 1.1.21), PerlPrimer serves molecular-biology, genomics, and diagnostics laboratories that require rapid, accurate primer sets for endpoint, methylation-sensitive, or quantitative amplification experiments. The tool is available for free on get.nero.com, with downloads provided via trusted Windows package sources such as winget, always delivering the latest version and supporting batch installation of multiple applications.
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