The interaction of PALB2 with BRCA1 is required for the assembly of PALB2, BRCA2, and RAD51 nuclear foci. The interaction of PALB2 with BRCA1 is required.

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The interaction of PALB2 with BRCA1 is required for the assembly of PALB2, BRCA2, and RAD51 nuclear foci. The interaction of PALB2 with BRCA1 is required for the assembly of PALB2, BRCA2, and RAD51 nuclear foci. A. Levels of stable expression of wild-type PALB2 (FL), PALB2ΔC, PALB2Δ1-70, PALB2-L21P, and PALB2-L24P with an HA-Flag epitope tag in EUFA1341 fibroblasts are indicated for each cell line (input). Coimmunoprecipitation of BRCA1, BRCA2, and RAD51 was determined by immunoblotting. Blots for input extracts represent 2.5% of the amount of protein used for immunoprecipitation. B. Examples of PALB2 foci assembled by full-length (wild-type) PALB2, PALB2ΔC, PALB2-L21P, or pMMP vector alone. In each case, the expressed protein contained HA-Flag epitope tags. PALB2 foci detected with anti-HA antibodies (red) and RAD51 foci detected with anti-RAD51 antibodies (green) are shown in a merged image. Colocalization is indicated by yellow foci, whereas red foci indicate the presence of PALB2 but not RAD51 foci. C. Quantification of the assembly of each form of PALB2 into nuclear foci (top), and of the assembly of RAD51 (center) or BRCA1 (bottom) into foci in EUFA1341 fibroblasts reconstituted with each form of PALB2. D. Quantification of the assembly of BRCA2 foci in U2OS cells exogenously expressing wild-type PALB2, PALB2ΔC, PALB2Δ1-70, PALB2-L21P, or PALB2-L24P that were depleted of endogenous PALB2 using a siRNA against its 3′-UTR. Controls transfected with a siRNA directed against GFP are indicated. Cells were analyzed at 4 d after transfection with the siRNA. Cells were fixed at 16 h following treatment with 15 Gy IR or were left untreated, and average values ± SD were determined from three independent counts of 150 or more cells each (C-D). Fan Zhang et al. Mol Cancer Res 2009;7:1110-1118 ©2009 by American Association for Cancer Research