TCF21 and coronary artery disorder: RNAm-SNPs in CAD susceptibility genes may regulate gene expression at the mRNA (e.g., JCAD, MRAS, TCF21, and DHX36) or protein (e.g., ABO, C5orf38, CD209, CEP57, CTF1, IL3RA, LRRN1, QSOX2, SELE and VIMP) levels.