The genetic architecture of common traits, including the number,
frequency, and effect sizes of inherited variants that contribute to individual
risk, has been long debated. Genome-wide association studies have identified
scores of common variants associated with type 2 diabetes, but in aggregate,
these explain only a fraction of heritability. To test the hypothesis that
lower-frequency variants explain much of the remainder, the GoT2D and T2D-GENES
consortia performed whole genome sequencing in 2,657 Europeans with and without
diabetes, and exome sequencing in a total of 12,940 subjects from five ancestral
groups. To increase statistical power, we expanded sample size via genotyping
and imputation in a further 111,548 subjects. Variants associated with type 2
diabetes after sequencing were overwhelmingly common and most fell within
regions previously identified by genome-wide association studies. Comprehensive
enumeration of sequence variation is necessary to identify functional alleles
that provide important clues to disease pathophysiology, but large-scale
sequencing does not support a major role for lower-frequency variants in
predisposition to type 2 diabetes.
Despite decades of research, effects of different types of meditation on electroencephalographic (EEG) activity are still being defined. We compared practitioners of three different meditation traditions (Vipassana, Himalayan Yoga and Isha Shoonya) with a control group during a meditative and instructed mind-wandering (IMW) block. All meditators showed higher parieto-occipital 60–110 Hz gamma amplitude than control subjects as a trait effect observed during meditation and when considering meditation and IMW periods together. Moreover, this gamma power was positively correlated with participants meditation experience. Independent component analysis was used to show that gamma activity did not originate in eye or muscle artifacts. In addition, we observed higher 7–11 Hz alpha activity in the Vipassana group compared to all the other groups during both meditation and instructed mind wandering and lower 10–11 Hz activity in the Himalayan yoga group during meditation only. We showed that meditation practice is correlated to changes in the EEG gamma frequency range that are common to a variety of meditation practices.
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