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Mol. Cell. Biol., 01 1996, 414-421, Vol 16, No. 1
X Nan, P Tate, E Li and A Bird
MeCP2 is a chromosomal protein that is concentrated in the centromeric
heterochromatin of mouse cells. In vitro, the protein binds preferentially
to DNA containing a single symmetrically methylated CpG. To find out
whether the heterochromatic localization of MeCP2 depended on DNA
methylation, we transiently expressed MeCP2-LacZ fusion proteins in
cultured cells. Intact protein was targeted to heterochromatin in wild-type
cells but was inefficiently localized in mutant cells with low levels of
genomic DNA methylation. Deletions within MeCP2 showed that localization to
heterochromatin required the 85-amino-acid methyl- CpG binding domain but
not the remainder of the protein. Thus MeCP2 is a methyl-CpG-binding
protein in vivo and is likely to be a major mediator of downstream
consequences of DNA methylation.
Copyright © 1996, American Society for Microbiology
DNA methylation specifies chromosomal localization of MeCP2
Institute of Cell and Molecular Biology, University of Edinburgh, United Kingdom.
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