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As proposed in the mutational meltdown model, selection is likely the force reducing the number of deleterious mutations that become fixed in p-endosymbiont populations.
Older men are more likely than young ones to father a child who develops autism or schizophrenia, because of random mutations that become more numerous with advancing paternal age, scientists reported on Wednesday, in the first study to quantify the effect as it builds each year.
In the Science section, Benedict Carey describes the research: "Older men are more likely than young ones to father a child who develops autism or schizophrenia, because of random mutations that become more numerous with advancing paternal age, scientists reported on Wednesday.
In this study, we are specifically interested in determining if selection is acting to reduce the number of slightly deleterious mutations that become fixed in the population, thus slowing the process of Muller's ratchet in some insect/p-endosymbiont assemblages.
In contrast, reaching the global optimum on rugged landscapes is expected to be a function of the interactions between the specific mutations that become substituted, because fitness on complex landscapes is determined by the epistatic effects among combinations of mutations [27], [30], [31].
Therefore, on rugged fitness landscapes small populations, owing to increased variability in the fitness effects of beneficial mutations that become substituted [22], may locate a more diverse set of adaptive peaks, and on occasion ascend higher adaptive peaks than large populations.
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In one recent example from our pages, Bernhard Palsson and colleagues conducted whole-genome resequencing of E. coli strains undergoing selection, identifying mutations that became fixed during gradual adaptation (Nat. Genet. 38, 1406 1412; 2006).
Similar timing relationships between reverse and escape mutations were found for the appearance of Gag mutations that became complete.
The median (IQR) appearance of reverse mutations that reached completeness was 54 (30 78) days p/s, whereas the median appearance of escape mutations that became complete later was 90 (44–196) days p/s (p = 0.006).
The novel hotspot mutations that became validated (14 genes) were then screened in 10 CRC cell lines.
We examined longitudinal data of patients with imatinib-resistant mutations that became undetectable by direct Sanger sequencing, to determine whether 'long dormant' mutations could reappear, and the circumstances related to their reappearance.
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