piRNAs are targeted to repeated sequences, including TEs, and the silencing process involves an amplification cycle (ping-pong), and acts through RNA destruction, epigenetic modification of the homologous DNA locus, and the formation of heterochromatin.
The frequency of targeting to repeats by piggyBac was 31.8%, with a slight preference for SINEs.
This weakness of the tested enrichment design would also apply to other hybridization-based sequence capture bait designs that subject targets to repeat masking before probe design.
These include: i) only marked birds with known breeding status were targeted to avoid repeated sampling on the same individuals in the same breeding season.
We generated transgenic fly lines that expressed both SU VAR 3 9 and JIL-1 LacI fusion proteins to ensure that both proteins were targeted to the lacO repeats.
We designed 2,138 EST-SSR primer pairs from the identified SSRs (Additional file 2), with 94.6% of them targeted to amplify perfect repeats and over 70% of the primers targeted at trinucleotide motif types.
Taken together, both the disintegration specificity and the deep sequencing data for integration support the hypothesis that integration is targeted to the leader-repeat 1 junction on the plus strand at least in part by the inherent sequence specificity of Cas1, which presumably involves specific recognition of these bases within the active site of the enzyme.
The feasibility of this approach for labeling chromosomes in suspension was confirmed by Gygi et al. (2002) who used a polyamide targeted to a sequence motif repeated in heterochromatic regions to discriminate by flow cytometry human chromosome 9 from chromosomes 10, 11, and 12. Surprisingly, this method has not been used by others.
Based on the literature which suggests that increasing perceived risk motivates behavior change, we report on the effectiveness of four risk-communication interventions targeted to increase initial, yearly and repeat fecal occult screening (FOBT) among carpenters (N = 860) over a 3-year period.
This, alongside the broader mass-media campaign advertising is a low cost promotion that can be targeted to particular populations and warrants repeat use.
