Fig. 7

Profiles of bivalent H3K4me3-H3K27me3 histone modifications present in active genes in potato upon cold stress. a Active genes (n = 6442) in potato tubers were associated with enrichment of the bivalent H3K4me3-H3K27me3 mark in gene body regions upon cold stress. Genes were divided into 100 bins and aligned together from TSSs to TTS. Genes flanking regions (± 1 kb) were analyzed in 100 bins. Each active gene showed transcription (FPKM> 1) in both RT and cold samples. b Bivalent H3K4me3-H3K27me3 modification levels for the gene body regions of the active genes in the potato RT and cold tubers. Gene body regions indicate the genomic regions from TSSs to TTSs. Bivalent H3K4me3-H3K27me3 histone modification signal was measured by quantifying the mid-point of pair-end sequential K4-K27 ChIP-seq reads within each bin and normalized to control data K4-noAb and to the read number per bp genome region per million mapped reads