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ACE File Format
The ACE file format is a specification for storing data about genomic contigs. The original ACE format was developed for use with Consed, a program for viewing, editing, and finishing DNA sequence assemblies. ACE files are generated by various assembly programs, including Phrap, CAP3, Newbler Newbler is a software package for '' de novo'' DNA sequence assembly. It is designed specifically for assembling sequence data generated by the 454 GS-series of pyrosequencing platforms sold by 454 Life Sciences, a Roche Diagnostics company. Usag ..., Arachne, AMOS (more specifically Minimo) and Tigr Assembler v2. External links ACE format specificationContig representation in several assembly formats Computer file formats {{bioinformatics-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Contig
A contig (from ''contiguous'') is a set of overlapping DNA segments that together represent a consensus region of DNA.Gregory, S. ''Contig Assembly''. Encyclopedia of Life Sciences, 2005. In bottom-up sequencing projects, a contig refers to overlapping sequence data ( reads); in top-down sequencing projects, contig refers to the overlapping clones that form a physical map of the genome that is used to guide sequencing and assembly.Dear, P. H. ''Genome Mapping''. Encyclopedia of Life Sciences, 2005. . Contigs can thus refer both to overlapping DNA sequences and to overlapping physical segments (fragments) contained in clones depending on the context. Original definition of contig In 1980, Staden wrote: ''In order to make it easier to talk about our data gained by the shotgun method of sequencing we have invented the word "contig". A contig is a set of gel readings that are related to one another by overlap of their sequences. All gel readings belong to one and only one con ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Consed
Consed is a program for viewing, editing, and finishing DNA sequence assemblies. Originally developed for sequence assemblies created with phrap, recent versions also support other sequence assembly programs like Newbler. History Consed was originally developed as a contig editing and finishing tool for large-scale cosmid shotgun sequencing in the Human Genome Project. At genome sequencing centers, Consed was used to check assemblies generated by phrap, solve assembly problems like those caused by highly identical repeats, and finishing tasks like primer picking and gap closure. Development of Consed has continued after the completion of the Human Genome Project. Current Consed versions support very large projects with millions of reads, enabling the use with newer sequencing methods like 454 sequencing and Solexa Illumina, Inc. is an American biotechnology company, headquartered in San Diego, California. Incorporated on April 1, 1998, Illumina develops, manufactures, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sequence Assembly
In bioinformatics, sequence assembly refers to aligning and merging fragments from a longer DNA sequence in order to reconstruct the original sequence. This is needed as DNA sequencing technology might not be able to 'read' whole genomes in one go, but rather reads small pieces of between 20 and 30,000 bases, depending on the technology used. Typically, the short fragments (reads) result from shotgun sequencing genomic DNA, or gene transcript ( ESTs). The problem of sequence assembly can be compared to taking many copies of a book, passing each of them through a shredder with a different cutter, and piecing the text of the book back together just by looking at the shredded pieces. Besides the obvious difficulty of this task, there are some extra practical issues: the original may have many repeated paragraphs, and some shreds may be modified during shredding to have typos. Excerpts from another book may also be added in, and some shreds may be completely unrecognizable. Genom ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phrap
Phrap is a widely used program for DNA sequence assembly. It is part of the Phred-Phrap-Consed package. History Phrap was originally developed by Prof. Phil Green for the assembly of cosmids in large-scale cosmid shotgun sequencing within the Human Genome Project. Phrap has been widely used for many different sequence assembly projects, including bacterial genome assemblies and EST assemblies. Phrap was written as a command line program for easy integration into automated data workflows in genome sequencing centers. For users who want to use Phrap from a graphical interface, the commercial programs MacVector (for Mac OS X only) and CodonCode Aligner (for Mac OS X and Microsoft Windows) are available. Methods A detailed (albeit partially outdated) description of the Phrap algorithms can be found in thPhrap documentation A recurring thread within the Phrap algorithms is the use of Phred quality scores. Phrap used quality scores to mitigate a problem that other assembly progra ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Newbler
Newbler is a software package for '' de novo'' DNA sequence assembly. It is designed specifically for assembling sequence data generated by the 454 GS-series of pyrosequencing platforms sold by 454 Life Sciences, a Roche Diagnostics company. Usage Newbler can run via a Java GUI (gsAssembler) or the command line (runAssembly). It works natively with the .SFF data output by the sequencer, but is also able to accept FASTA files, containing nucleotide sequences, with or without quality information, and FASTQ files. It will use older Sanger sequence data if appropriately formatted to aid in assembly and scaffolding. See also *Sequencing *Sequence assembly In bioinformatics, sequence assembly refers to aligning and merging fragments from a longer DNA sequence in order to reconstruct the original sequence. This is needed as DNA sequencing technology might not be able to 'read' whole genomes in one ... References External links454 Sequencing home page Bioinformatics software ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
