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The ORF Finder (Open Reading Frame Finder) [16] is a graphical analysis tool which finds all open reading frames of a selectable minimum size in a user's sequence or in a sequence already in the database. This tool identifies all open reading frames using the standard or alternative genetic codes.
An open reading frame (ORF) is a reading frame that has the potential to be transcribed into RNA and translated into protein. It requires a continuous sequence of DNA which may include a start codon, through a subsequent region which has a length that is a multiple of 3 nucleotides, to a stop codon in the same reading frame.
Overprinting refers to a type of overlap in which all or part of the sequence of one gene is read in an alternate reading frame from another gene at the same locus. [4] The alternative open reading frames (ORF) are thought to be created by critical nucleotide substitutions within an expressible pre-existing gene, which can be induced to express ...
An upstream open reading frame (uORF) is an open reading frame (ORF) within the 5' untranslated region (5'UTR) of an mRNA. uORFs can regulate eukaryotic gene expression. [1] [2] Translation of the uORF typically inhibits downstream expression of the primary ORF. However, in some genes such as yeast GCN4, translation of specific uORFs may ...
The regulatory sequence elements (yellow) at the start of a eukaryotic protein-coding gene, can be immediately upstream of the open read frame (ORF, red), or many kilobases away (upstream or downstream). Promoter and enhancer regions up-regulate (and silencers downregulate) transcription from DNA to mRNA.
ORF1a is the first open reading frame at the 5' end of the genome. Together ORF1ab occupies about two thirds of the genome, with the remaining third at the 3' end encoding the structural proteins and accessory proteins. [1] [2] [3] It is translated from a 5' capped RNA by cap-dependent translation. [1]
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Another form of translational regulation in eukaryotes comes from unique elements on the 5′ UTR called upstream open reading frames (uORF). These elements are fairly common, occurring in 35–49% of all human genes. [18] A uORF is a coding sequence located in the 5′ UTR located upstream of the coding sequences initiation site.