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Vol. 15, No. 22, pp. 2940-2944, November 15, 2001
Laboratory of Molecular Immunoregulation,
SAIC, National Cancer Institute at Frederick, Frederick,
Maryland 21702-1201, USA
Methylation patterns of the mammalian genome are thought to be
crucial for development. The precise mechanisms designating specific
genomic loci for methylation are not known. Targeted deletion of
Lsh results in perinatal lethality with a rather normal development. We report here, however, that Lsh
/
mice show substantial loss of methylation throughout the genome. The
hypomethylated loci comprise repetitive elements and single copy genes.
This suggests that global genomic methylation is not absolutely
required for normal embryogenesis. Based on the similarity of Lsh to
other SNF2 chromatin remodeling proteins, it suggests that alteration
of chromatin affects global methylation patterns in mice.
[Key Words: Lsh; methylation; SNF2; SWI/SNF complex; chromatin]
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