Our findings indicate that STAT5Ptyr in T1D but not non-autoimmune monocytes respond to GM-CSF stimulation by binding to the promoter of CSF2 and in an enhancer region associated with the Chromosome 1 region between IL10 and PTGS2. ChIP evaluation of GM-CSF-stimulated STAT5Ptyr binding at these sites show coincidence with histone modification and recruitment of epigenetic and transcription proteins that can modulate epigenetic gene expression in chromatin regions. The gene discussed is CSF2; the disease is type 1 diabetes mellitus.