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Functional and evolutionary implications of gene orthology

TLDR
The complexity of the evolution of gene–phenotype relationships is discussed and the validity of the key implications of orthology and paralogy relationships as general statistical trends and guiding principles are assessed.
Abstract
The concepts of orthology and paralogy are fundamental to comparative genomics and are also frequently used for the functional annotation of uncharacterized genes. However, assumptions regarding function have recently been challenged, and the implications of assigning genes as orthologues or paralogues are far from straightforward.

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eggNOG 5.0: a hierarchical, functionally and phylogenetically annotated orthology resource based on 5090 organisms and 2502 viruses.

TL;DR: eggNOG as discussed by the authors is a public database of orthology relationships, gene evolutionary histories and functional annotations, with a major update of the underlying genome sets, which have been expanded to 4445 representative bacteria and 168 archaea derived from 25 038 genomes.
Journal ArticleDOI

Fast Genome-Wide Functional Annotation through Orthology Assignment by eggNOG-Mapper

TL;DR: EggNOG-mapper is developed, a tool for functional annotation of large sets of sequences based on fast orthology assignments using precomputed clusters and phylogenies from the eggNOG database, and scored within the top-5 methods in the three GO categories using the CAFA2 NK-partial benchmark.
Journal ArticleDOI

The Harvest suite for rapid core-genome alignment and visualization of thousands of intraspecific microbial genomes.

TL;DR: The Harvest suite of core-genome alignment and visualization tools for the rapid and simultaneous analysis of thousands of intraspecific microbial strains is presented, demonstrating that the approach exhibits unrivaled speed while maintaining the accuracy of existing methods.
Posted ContentDOI

eggNOG-mapper v2: Functional Annotation, Orthology Assignments, and Domain Prediction at the Metagenomic Scale

TL;DR: For example, EggNOG-mapper v2 as mentioned in this paper is a tool for functional annotation based on precomputed orthology assignments, optimized for vast (meta)genomic data sets.
References
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Journal ArticleDOI

Gapped BLAST and PSI-BLAST: a new generation of protein database search programs.

TL;DR: A new criterion for triggering the extension of word hits, combined with a new heuristic for generating gapped alignments, yields a gapped BLAST program that runs at approximately three times the speed of the original.
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A genomic perspective on protein families

TL;DR: Comparison of proteins encoded in seven complete genomes from five major phylogenetic lineages and elucidation of consistent patterns of sequence similarities allowed the delineation of 720 clusters of orthologous groups (COGs), which comprise a framework for functional and evolutionary genome analysis.
Journal ArticleDOI

Distinguishing Homologous From Analogous Proteins

TL;DR: This work provides a means by which it is possible to determine whether two groups of related proteins have a common ancestor or are of independent origin, and how many nucleotide positions must differ in the genes encoding the two presumptively homologous proteins.
Journal ArticleDOI

Automatic clustering of orthologs and in-paralogs from pairwise species comparisons.

TL;DR: This study led to the identification with a high degree of confidence of over a dozen novel worm-mammalian ortholog assignments that were previously undetected because of shortcomings of phylogenetic methods.
Journal ArticleDOI

Orthologs, Paralogs, and Evolutionary Genomics 1

TL;DR: This review examines in depth the definitions and subtypes of orthologs and paralogs, outlines the principal methodological approaches employed for identification of orthology and paralogy, and considers evolutionary and functional implications of these concepts.
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