Combined actions of HDACs and DNA repair outweigh HATs, resulting in expansions (a). But perturbing this situation, for example, adding an HDAC inhibitor (b), changes the outcome (stabilizing trinucleotide repeats). Q. ChoiCharles 2012 <p>Combined actions of HDACs and DNA repair outweigh HATs, resulting in expansions (a). But perturbing this situation, for example, adding an HDAC inhibitor (b), changes the outcome (stabilizing trinucleotide repeats).</p>