“…The genetic predisposition [ 95 , 96 , 97 , 98 ] and epigenetic factors, including an increased level of gene methylation, histone modification, and microRNA pattern variation [ 99 , 100 , 101 ], are important for the development of PCOS. Environmental and socioeconomic factors are also of great importance, including ethnic characteristics, nutrition, and adverse environmental factors (toxins, xenobiotics, chemical mutagens, and ionizing radiation) [ 102 , 103 , 104 ]. The development of PCOS in women largely depends on the effects of maternal hormones during the prenatal period, as well as on their metabolic and hormonal status in the early childhood [ 84 , 99 , 105 , 106 , 107 ].…”