[1] Marinus MG, Casadesus J. Roles of DNA adenine methy-lation in host-pathogen interactions: mismatch repair, transcriptional regulation, and more. FEMS Microbiol Rev, 2009, 33(3): 488–503. <\p>

[2] Chatti A, Landoulsi A. The DNA-methylation state regu-lates virulence and stress response of Salmonella. C R Biol, 2008, 331(9): 648–654. <\p>

[3] Collier J. Epigenetic regulation of the bacterial cell cycle. Curr Opin Microbiol, 2009, 12(6): 722–729. <\p>

[4] Saya Kagiwada, Kazuki Kurimoto, Takayuki Hirota, Ma-sashi Yamaji and Mitinori Saitou. Replication-coupled passive DNA demethylation for the erasure of genome imprints in mice. EMBO J, 2012, 32: 340–353. <\p>

[5] Pleasance ED, Cheetham RK, Stephens PJ, McBride DJ, Humphray SJ, Greenman CD, Varela I, Lin ML, Ordóñez GR, Bignell GR, Ye K, Alipaz J, Bauer MJ, Beare D, But-ler A, Carter RJ, Chen L, Cox AJ, Edkins S, Kokko- Gonzales PI, Gormley NA, Grocock RJ, Haudenschild CD, Hims MM, James T, Jia M, Kingsbury Z, Leroy C, Mar-shall J, Menzies A, Mudie LJ, Ning Z, Royce T, Schulz- Trieglaff OB, Spiridou A, Stebbings LA, Szajkowski L, Teague J, Williamson D, Chin L, Ross MT, Campbell PJ, Bentley DR, Futreal PA, Stratton MR. A comprehensive catalogue of somatic mutations from a human cancer ge-nome. Nature, 2010, 463(7278): 191–196. <\p>

[6] Alexandrov LB, Nik-Zainal S, Wedge DC, Aparicio SA, Behjati S, Biankin AV, Bignell GR, Bolli N, Borg A, Bør-resen-Dale AL, Boyault S, Burkhardt B, Butler AP, Caldas C, Davies HR, Desmedt C, Eils R, Eyfjörd JE, Foekens JA, Greaves M, Hosoda F, Hutter B, Ilicic T, Imbeaud S, Imielinsk M, Jäger N, Jones DT, Jones D, Knappskog S, Kool M, Lakhani SR, López-Otín C, Martin S, Munshi NC, Nakamura H, Northcott PA, Pajic M, Papaemmanuil E, Paradiso A, Pearson JV, Puente XS, Raine K, Ramakrishna M, Richardson AL, Richter J, Rosenstiel P, Schlesner M, Schumacher TN, Span PN, Teague JW, Totoki Y, Tutt AN, Valdés-Mas R, van Buuren MM, van 't Veer L, Vin-cent-Salomon A, Waddell N, Yates LR, Australian Pancre-atic Cancer Genome Initiative, ICGC Breast Cancer Con-sortium, ICGC MMML-Seq Consortium, ICGC PedBrain, Zucman-Rossi J, Futreal PA, McDermott U, Lichter P, Meyerson M, Grimmond SM, Siebert R, Campo E, Shibata T, Pfister SM, Campbell PJ, Stratton MR. Signatures of mutational processes in human cancer. Nature, 2013, 500(7463): 415–421. <\p>

[7] Popp C, Dean W, Feng S, Cokus SJ, Andrews S, Pellegrini M, Jacobsen SE, Reik W. Genome-wide erasure of DNA methylation in mouse primordial germ cells is affected by AID deficiency. Nature, 2010, 463: 1101–1105. <\p>

[8] Kriaucionis S, Heintz N. The nuclear DNA base 5- hy-droxymethylcytosine is present in purkinje neurons and the brain. Science, 2009, 324(5929): 929–930. <\p>

[9] Tahiliani M, Koh KP, Shen Y, Pastor WA, Bandukwala H, Brudno Y, Agarwal S, Iyer LM, Liu DR, Aravind L, Rao A. Conversion of 5-methylcytosine to 5-hydroxymethylcytosine in mammalian DNA by MLL partner TET1. Science, 2009, 324(5929): 930–935. <\p>

[10] He YF, Li BZ, Li Z, Liu P, Wang Y, Tang Q, Ding J, Jia Y, Chen Z, Li L, Sun Y, Li X, Dai Q, Song CX, Zhang K, He C, Xu GL. Tet-mediated formation of 5-carboxylcytosine and its excision by TDG in mammalian DNA. Science, 2011, 333(6047): 1303–1307. <\p>

[11] Ito S, Shen L, Dai Q, Wu SC, Collins LB, Swenberg JA, He C, Zhang Y. Tet proteins can convert 5-methylcytosine to 5-formylcytosine and 5-carboxylcytosine. Science, 2011, 333(6047): 1300–1303. <\p>

[12] Gu TP, Guo F, Yang H, Wu HP, Xu GF, Liu W, Xie ZG, Shi L, He X, Jin SG, Iqbal K, Shi YG, Deng Z, Szabó PE, Pfeifer GP, Li J, Xu GL. The role of Tet3 DNA dioxygenase in epigenetic reprogramming by oocytes. Nature, 2011, 477(7366): 606–610. <\p>

[13] Wi