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Journal of Cell Science, Vol 109, Issue 9 2199-2206, Copyright © 1996 by Company of Biologists

JOURNAL ARTICLES

Epigenetic control of mammalian centromere protein binding: does DNA methylation have a role?

AR Mitchell, P Jeppesen, L Nicol, H Morrison and D Kipling
MRC Human Genetics Unit, Western General Hospital, Edinburgh, UK.

Chromosome 1 of the inbred mouse strain DBA/2 has a polymorphism associated with the minor satellite DNA at its centromere. The more terminal block of satellite DNA sequences on this chromosome acts as the centromere as shown by the binding of CREST ACA serum, anti-CENP-B and anti-CENP-E polyclonal sera. Demethylation of the minor satellite DNA sequences accomplished by growing cells in the presence of the drug 5-aza-2'-deoxycytidine results in a redistribution of the CENP-B protein. This protein now binds to an enlarged area on the more terminal block and in addition it now binds to the more internal block of minor satellite DNA sequences on chromosome 1. The binding of the CENP-E protein does not appear to be affected by demethylation of the minor satellite sequences. We present a model to explain these observations. This model may also indicate the mechanism by which the CENP-B protein recognises specific sites within the arrays of minor satellite DNA on mouse chromosomes.
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© The Company of Biologists Ltd 1996