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Deprecated: Implicit conversion from float 209.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Dev+Cell 2015 ; 33 (3): 314-27 Nephropedia Template TP
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DNA sequence-specific binding of CENP-B enhances the fidelity of human centromere function #MMPMID25942623
Fachinetti D; Han JS; McMahon MA; Ly P; Abdullah A; Wong AJ; Cleveland DW
Dev Cell 2015[May]; 33 (3): 314-27 PMID25942623show ga
Human centromeres are specified by a stably inherited epigenetic mark that maintains centromere position and function through a two-step mechanism relying on self-templating centromeric chromatin assembled with the histone H3 variant CENP-A, followed by CENP-A-dependent nucleation of kinetochore assembly. Nevertheless, natural human centromeres are positioned within specific megabase chromosomal regions containing ?-satellite DNA repeats, which contain binding sites for the DNA sequence specific binding protein CENP-B. We now demonstrate that CENP-B directly binds both CENP-A?s amino-terminal tail and CENP-C, a key nucleator of kinetochore assembly. DNA sequence-dependent binding of CENP-B within ?-satellite repeats is required to stabilize optimal centromeric levels of CENP-C. Chromosomes bearing centromeres without bound CENP-B, including the human Y chromosome, are shown to missegregate in cells at rates several fold higher than chromosomes with CENP-B containing centromeres. These data demonstrate a DNA sequence-specific enhancement by CENP-B of the fidelity of epigenetically defined human centromere function.