The replacement strategy tested for ATXN3. (A) The target site and nucleotide sequence of siRNA directed at the ATXN3 transcript. (B) The western blot analysis of the ataxin-3 levels in the HeLa cells at 72 h after transfection with 100 nM siRNA SCA3 and/or ATXN3-8Q plasmid. C - the reference line shows the ATXN3 expression level in the cells transfected with control siRNA. The GAPDH protein level was used as a loading control.