“…DNA methylation (and heterochromatin in general) has been reported to suppress homologous recombination (Pàldi et al, 1995;Maloisel and Rossignol, 1998;Schnable et al, 1998;Fu et al, 2002;Yao et al, 2002;Yamada et al, 2004;Myers et al, 2005) as well as transposition (Yoder et al, 1997;Walsh et al, 1998;Hirochika et al, 2000;Robertson, 2001;Bird, 2002;Kato et al, 2003). Accordingly, reports of deletions caused by homologous recombination between LINE-1 elements are rare (Segal et al, 1999) except in cancers (Florl and Schulz, 2003) where LINE-1 elements are frequently hypomethylated (Santourlidis et al, 1999;Takai et al, 2000;Ehrlich, 2002;Carnell and Goodman, 2003;Florl et al, 2004;Roman-Gomez et al, 2005). LINE-1 transposition has also been reported to be elevated in cancers (Schulz, 2006).…”