Genre
Journal ArticleDate
2007-10-10Author
Acquisti, CPoste, G
Curtiss, D
Kumar, S
Subject
AnimalsBase Sequence
Cattle
CpG Islands
DNA
Dogs
Evolution, Molecular
Genome
Humans
Mice
Molecular Sequence Data
Mutation
Pan troglodytes
Selection, Genetic
Species Specificity
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http://hdl.handle.net/20.500.12613/5617
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Show full item recordDOI
10.1371/journal.pone.0001022Abstract
Background. Nullomers are short DNA sequences that are absent from the genomes of humans and other species. Assuming that nullomers are the signatures of natural selection against deleterious sequences in humans, the use of nullomers in drug target identification, pesticide development, environmental monitoring, and forensic applications has been envisioned. Results. Here, we show that the hypermutability of CpG dinucleotides, rather than the natural selection against the nullomer sequences, is likely the reason for the phenomenal event of short sequence motifs becoming nullomers. Furthermore, many reported human nullomers differ by only one nucleotide, which reinforces the role of mutation in the evolution of the constellation of nullomers in populations and species. The known nullomers in chimpanzee, cow, dog, and mouse genomes show patterns that are consistent with those seen in humans. Conclusions. The role of mutations, instead of selection, in generating nullomers cast doubt on the utility of nullomers in many envisioned applications, because of their dependence on the role of lethal selection on the origin of nullomers. © 2007 Acquisti et al.Citation to related work
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http://dx.doi.org/10.34944/dspace/5599