Sentence examples for modification peaks were from inspiring English sources
Moreover, selected histone modification peaks were also validated by ChIP-qPCR (Additional file 1: Figure S1A).
To ensure that selected p300 peaks contain histone modification marks under study, distal p300 peaks that did not overlap any histone modification peaks were excluded.
All transcription factor and histone modification peaks were called using Sole-Search software using sequenced MCF7 input as a control [ 12, 58].
Histone modification peaks were identified from the raw ChIP-Seq data using the next-generation sequencing analysis tools provided in the Galaxy Project [ 13].
To provide a co-occurrence criterion for inclusion of genes in the imprinted-candidate pool, genomic features (promoters, CpG islands, histone modification peaks) were considered overlapping if they shared one or more bases in common.
It is remarkable that for all the modifications studied, peaks were higher for the TATA-less genes (as seen in Figure 2a for H3K9ac), with the expected exception of H3K4me1, for which the opposite occurred.
After iodo-benzoic acid modification, three peaks are again detected by LC (Supporting Information Figure S2); however, comparison with the synthetic peptides by RDD reveals that the three peaks represent l-isoAsp, d-isoAsp, and l-Asp with corresponding SRDD values of 2.6, 2.4, and 3.1 (SRDD < 3.2 indicates high similarity, see description above).
Only histone modification peaks that are significantly variable across the four conditions (FDR <0.05) with differences that are larger than one pooled standard deviation are counted.
For identifying regions that were enriched for a specific modification across datasets or between replicates, peaks were overlapped using mergePeaks (Homer suite) [ 30].
About 70% of the PREP1 peaks were associated with chromatin modifications typical of active gene promoters (H3K4me3+ and H3K27Ac+) (Fig. 5A).
When compared with the spectrum of OAMB biomass (Fig. 3a) additional absorption peaks were noted which confirmed the modification.
