NoRC affects centromere function.

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NoRC affects centromere function. NoRC affects centromere function. (A) Depletion of TIP5 induces apoptosis. Percentage of apoptotic HeLa/Kyoto cells transfected with control siRNA (ctrl) or siRNA against TIP5 (siTIP5). Data represent mean values and error bars indicate s.e.m. (n=3). A representative apoptotic cell is shown in the inset. (B) Knockdown of TIP5 delays metaphase plate formation and prolongs mitosis. Representative images of mitotic HeLa/Kyoto cells 72 h after transfection with control (ctrl) and TIP5‐specific siRNA (siTIP5). The graph indicates the length of mitosis in a representative experiment (N=3), each dot represents one cell and red lines indicate the median duration of mitosis (Mann–Whitney test, *P=0.028, n=43). Scale bar, 5 μm. (C) NoRC is localized in nucleoli and the nucleoplasm. Three‐dimensional reconstruction of deconvolved image of an interphase U2OS cell nucleus immunostained with α‐TIP5 (red) and α‐UBF (green) antibodies. DNA was counterstained with DAPI. Scale bar, 5 μm. (D) TIP5 localizes at centromeres. Left: Z‐projection of a representative nucleus from U2OS cells immunostained with α‐TIP5 (red) and α‐CENPs antibodies (green). The same nucleus showing colocalization of TIP5 with CENPs (white spots) is shown below. Middle: magnification of an indicated section showing colocalization of TIP5 and CENPs (yellow). Scale bar, 5 μm. Right: quantification of TIP5‐positive spots colocalizating with CENPs in a representative experiment (N=4), each dot represents one cell (unpaired t‐test, P‐value ****<0.0001, n=45). (E) ChIP comparing TIP5 occupancy at major satellite repeats and the rDNA promoter in NIH3T3 cells. Error bars represent s.e.m. (n=3). (F) NoRC triggers heterochromatin formation at pericentromeres. H4K20me3 and H3K9me3 occupancy at pericentromeres of NIH3T3 cells overexpressing TIP5 (left) and in TIP5‐depleted cells (right). ChIPs from mock‐transfected cells were used as reference (ctrl=1). Error bars represent s.e.m. (n=3). ChIP, chromatin immunoprecipitation; DAPI, 4,6‐diamidino‐2‐phenylindole; NoRC, nucleolar remodelling complex; siRNA, short interfering RNA. Anna Postepska‐Igielska et al. EMBO Rep. 2013;14:704-710 © as stated in the article, figure or figure legend