| 翻訳と辞書 |
OrthoDB
OrthoDB presents a catalog of orthologous protein-coding genes across vertebrates, arthropods, fungi, and bacteria. Orthology refers to the last common ancestor of the species under consideration, and thus OrthoDB explicitly delineates orthologs at each radiation along the species phylogeny. The database of orthologs presents available protein descriptors, together with Gene Ontology and InterPro attributes, which serve to provide general descriptive annotations of the orthologous groups, and facilitate comprehensive orthology database querying. OrthoDB also provides computed evolutionary traits of orthologs, such as gene duplicability and loss profiles, divergence rates, and sibling groups, now extended to detail intron-exon architectures, syntenic orthologs, and parent-child trees.
== Methodology ==
Orthology is defined relative to the last common ancestor of the species being considered, thereby determining the hierarchical nature of orthologous classifications. This is explicitly addressed in OrthoDB by application of the orthology delineation procedure at each radiation point of the considered phylogeny, empirically computed over the super-alignment of single-copy orthologs using a maximum-likelihood approach. The OrthoDB implementation employs a Best-Reciprocal-Hit (BRH) clustering algorithm based on all-against-all Smith–Waterman protein sequence comparisons. Gene set pre-processing selects the longest protein-coding transcript of alternatively spliced genes and of very similar gene copies. The procedure triangulates BRHs to progressively build the clusters and requires an overall minimum sequence alignment overlap to avoid domain walking. These core clusters are further expanded to include all more closely related within-species in-paralogs, and the previously identified very similar gene copies.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「OrthoDB」の詳細全文を読む
スポンサード リンク
| 翻訳と辞書 : 翻訳のためのインターネットリソース |
Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.
|
|