Journal: Frontiers in Cell and Developmental Biology
Article Title: Loss of FAM111B protease mutated in hereditary fibrosing poikiloderma negatively regulates telomere length
doi: 10.3389/fcell.2023.1175069
Figure Lengend Snippet: FAM111B -deficient cells have shorter telomeres. (A) Widefield images of chromosome spreads and (B) interphase cells from wild-type (WT) and FAM111B knockout cells stained with fluorescent probe against telomeric repeats. Scale bar 20 μm. (C) Quantification of individual TeloFISH foci intensity in metaphase spreads and interphase cells. Green bars show averages of N = 3, with at least 30 metaphase spreads or 60 cells scored per sample in each experiment. (D) Widefield images of wild-type (WT) and FAM111B −/- U2OS cells stained with TRF2 antibodies. Scale bar 20 μm. (E) Quantification of TRF2 foci intensity in U2OS wild-type (WT) FAM111B negative U2OS cells. Green bars show averages of N = 3 experiments, where 400 cells was scored per sample in each experiment. (F) Quantification of TRF2 intensities in U2OS cells over-expressing empty vector (EV) or FLAG-tagged FAM111B variants wild-type (WT), protease-dead (PD) or HFP mutant (Q430P, QP), respectively. Green bars show averages of N = 3 experiments, with at least 50 cells per sample scored in each experiment. K-W test was used in C, E and (F) .
Article Snippet: Primary antibodies were as follows: mouse anti-human BLM (sc-365753, Santa Cruz Biotechnology) at 1:250 (IF), mouse anti-BrdU (347580, Becton Dickinson) at 1:20 (Flow cytometry), rabbit anti-human FAM111B (HPA038637, Atlas Antibodies) at 1:1,000 (IB and IF), mouse anti-human Histone H3 (10799, Abcam) at 1:1,000 (IB), mouse anti-human Lamin A/C (sc-376248, Santa Cruz Biotechnology) at 1:1,000 (IB and IF), rabbit anti-human Lamin B1 (12987-1-AP, Proteintech Group) at 1:1,000 (IB and IF), rabbit anti-human NUP42 (16587-1-AP, Proteintech Group) at 1:1,000 (IB), mouse anti-human PCNA (sc-56, Santa Cruz Biotechnology) at 1:1,000 (IF), rabbit anti-human SEC13 (15397-1-AP, Proteintech Group) at 1:1,000 (IB), mouse anti-human TRF2 (NB100-56506, Novus Biologicals) at 1:1,000 (IF), mouse anti-human αTubulin (T6074, Sigma) at 1:10,000 (WB) or 1:1,000 (IF).
Techniques: Knock-Out, Staining, Expressing, Plasmid Preparation, Mutagenesis