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Heat stress affects muscle development and meat quality in food animals; however, little is known regarding its regulatory mechanisms at the epigenetic level, such as via DNA methylation. In this study, we aimed to compare the DNA methylation profiles between control and heat-stressed pigs to identify candidate genes for skeletal muscle development and meat quality. Whole-genome bisulfite sequencing was used to investigate the genome-wide DNA methylation patterns in the  longissimus dorsi  muscles of the pigs. Both groups showed similar proportions of methylation at CpG sites but exhibited different proportions at non-CpG sites. A total of 57,147 differentially methylated regions were identified between the two groups, which corresponded to 1,422 differentially methylated genes. Gene ontogeny and KEGG pathway analyses indicated that these were mainly involved in energy and lipid metabolism, cellular defense and stress responses, and calcium signaling pathways. This study revealed the global DNA methylation pattern of pig muscle between normal and heat stress conditions. The result of this study might contribute to a better understanding of epigenetic regulation in pig muscle development and meat quality.

Genome-wide DNA methylation profiles changes associated with constant heat stress in pigs as measured by bisulfite sequencing