Disclosed herein is a method for treating a subject having or suspected of having a disease or condition associated with aberrant hypomethylation of one or more genes in the subject, the method involving a tailored epigenomic modification of the subject using methylated polynucleotides directed to hypomethylated genes in the subject.Also disclosed herein is a medicinal composition for treating a subject having or suspected of having a disease or condition associated with aberrant hypomethylation of one or more genes in the subject, the composition including methylated polynucleotides directed to hypomethylated genes in the subject, so as to result in a tailored epigenomic modification of the subject upon administration.