Why Are We Here? - The Latest News around the World and from Arisaka Lab at UCLA
Tuesday, December 18, 2012
Evolution: Genomic pacemakers or ticking clocks?
Although different genes evolve at different rates, when complete sets of orthologous genes are considered across taxa, the distribution of rates is remarkably conserved. That is, the differences in the rates of evolution among genes in a genome remain consistent. A potential explanation for this observation is the molecular clock, which is a model that has been used widely in phylogenetics. Now, Koonin and colleagues show that available phylogenetic data are more compatible with an alternative model that they propose termed the universal pacemaker (UPM).