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The double cut and join (DCJ) model is a model for genome rearrangement used to define an edit distance between genomes based on gene order and orientation, rather than nucleotide sequence. It takes the fundamental units of a genome to be synteny blocks, maximal sections of DNA conserved between genomes. It focuses on changes due to genome rearrangement operations such as inversions, translocations as well as the creation and absorption of circular intermediates.

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  • Double Cut and Join Model (en)
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  • The double cut and join (DCJ) model is a model for genome rearrangement used to define an edit distance between genomes based on gene order and orientation, rather than nucleotide sequence. It takes the fundamental units of a genome to be synteny blocks, maximal sections of DNA conserved between genomes. It focuses on changes due to genome rearrangement operations such as inversions, translocations as well as the creation and absorption of circular intermediates. (en)
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  • The double cut and join (DCJ) model is a model for genome rearrangement used to define an edit distance between genomes based on gene order and orientation, rather than nucleotide sequence. It takes the fundamental units of a genome to be synteny blocks, maximal sections of DNA conserved between genomes. It focuses on changes due to genome rearrangement operations such as inversions, translocations as well as the creation and absorption of circular intermediates. A genome is described as a directed, edge labeled graph with each vertex having degree 1 or 2. Edges are labeled as synteny blocks, vertices of degree 1 represent telomeres, and vertices of degree 2 representing adjacencies between blocks. This requires that the genome consist of cycles and paths. Each component is called a chromosome. The beginning of each edge is called the tail, the end of each edge is called the head; together heads and tails are known as extremities. Vertices are described by their roles as heads and tails of blocks, for instance, in the figure, the adjacency which forms the head of marker 1 and the tail of marker 2 is labelled (h1, t2), the telomere formed by the head of 2 is (h2). A double cut and join (DCJ) operation consists of one of the following four transformations: * (i) breaking two adjacencies (a, b) and (c, d) to create two more adjacencies, (a, c) and (b,d) * (ii) taking an adjacency (a, b) and a telomere (c) to create a new adjacency and telomere, either as (a, c), (b) or (b,c), (a). * (iii) taking two telomeres (a) and (b) and creating a new adjacency (a, b) * (iv) breaking an adjacency (a, b) to create the two telomeres (a) and (b). An edit distance, the double cut and join distance, is defined between genomes with the same number of edges and , as the minimum number of DCJ operations needed to transform into . (en)
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