Words similar to presence-absence
Example sentences for: presence-absence
How can you use “presence-absence” in a sentence? Here are some example sentences to help you improve your vocabulary:
From the data on the presence-absence of each conserved gene pair in the analyzed genomes (excluding pairs of closely related species: E. coli-Buchnera sp., H. influenzae-P.
The topology of the tree based on gene pair conservation seems to carry a stronger phylogenetic signal than the gene presence-absence tree because it correctly groups together related free-living and parasitic bacteria despite major differences in gene repertoires (Fig.
Here, we compare the topologies produced with five, largely independent approaches to genome-tree building: i) presence-absence of genomes in Clusters of Orthologous Groups of proteins (COGs); ii) conservation of local gene order (pairs of adjacent genes) among prokaryotic genomes; iii) distribution of percent identity between apparent orthologs; iv) sequence conservation in concatenated alignments of ribosomal proteins; v) comparative analysis of multiple trees reconstructed for representative protein families.
Probably the most obvious of such characteristics is the presence-absence of representatives of the analyzed species in orthologous groups of genes, and recently, at least three groups have employed this approach to build genome trees, primarily for prokaryotes [ 8 9 10 ] . An alternative way to construct a genome tree involves using the mean or median level of similarity among all detectable pairs of orthologs as the measure of the evolutionary distance between species [ 11 ] . Yet another possibility involves building species trees by comparing gene orders.
We find that, while the presence-absence approach is most heavily affected by gene loss and horizontal transfer, the other four methods reveal stronger phylogenetic signals.
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