Disclosed herein are zinc finger peptides having at least 4 zinc finger domains, such as 6, 11, 12 or 18 zinc finger domains. The zinc finger peptides may be fused to effector domains for modulating gene expression. Zinc finger peptides of the invention are useful for targeting trinucleotide-repeat sequences in mutant genes and may have applications in gene therapy. Also disclosed are methods for constructing poly-zinc finger peptides having arrays of at least 8 zinc finger domains, along with zinc finger frameworks that may be useful for selecting zinc finger peptides from libraries.
