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Top: An ancestral gene duplicates to produce two paralogs (Genes A and B). A speciation event produces orthologs in the two daughter species. Bottom: in a separate species, an unrelated gene has a similar function (Gene C) but has a separate evolutionary origin and so is an analog .
Subfunctionalization is a neutral mutation process in which each paralog retains a subset of its original ancestral function. The figure illustrates that the ancestral gene (orange & blue) is capable of both functions before gene duplication.
Paralogs can be identified in single genomes through a sequence comparison of all annotated gene models to one another. Such a comparison can be performed on translated amino acid sequences (e.g. BLASTp, tBLASTx) to identify ancient duplications or on DNA nucleotide sequences (e.g. BLASTn, megablast) to identify more recent duplications.
Pierre Belon systematically compared the skeletons of birds and humans in his Book of Birds (1555) [1]. Homology was noticed by Aristotle (c. 350 BC), [1] and was explicitly analysed by Pierre Belon in his 1555 Book of Birds, where he systematically compared the skeletons of birds and humans.
Among archaea, RadB and RadC recombinase paralogs are found in many organisms belonging to Euryarchaeota, while a broader diversity of related recombinase paralogs are found in Crenarchaea, including Ral1, Ral2, Ral3, RadC, RadC1, and RadC2. The RAD51 paralogs contribute to efficient DNA double-strand break repair by homologous recombination ...
Gene redundancy is the existence of multiple genes in the genome of an organism that perform the same function. Gene redundancy can result from gene duplication. [1] Such duplication events are responsible for many sets of paralogous genes. [1]
This page was last edited on 25 October 2018, at 11:05 (UTC).; Text is available under the
Neofunctionalization is the process by which a gene acquires a new function after a gene duplication event. The figure shows that once a gene duplication event has occurred one gene copy retains the original ancestral function (represented by the green paralog), while the other acquires mutations that allow it to diverge and develop a new function (represented by the blue paralog).
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