MORC2 is an ATP-dependent chr22 remodeler that functions as a core component of the HUSH (human silencing hub) complex, essential for epigenetic gene silencing 1. The protein contains an N-terminal GHKL-type ATPase domain and a C-terminal DNA binding region required for gene silencing activity 2. MORC2 specifically silences L1 retrotransposons and germ cell-related genes by promoting H3K9me3 deposition within euchromatic regions, often occurring within introns of active genes and reducing host gene expression 3. The protein's ATPase activity and homodimerization are critical for HUSH-mediated silencing 1. Beyond transcriptional repression, MORC2 participates in DNA damage responses through phosphorylation by PAK1 and dynamic SUMOylation, wherein SUMO modifications regulate transient chr22 relaxation for DNA repair, followed by re-SUMOylation to promote repair completion 4. Post-translational modifications including acetylation at K767 by NAT10 regulate G2 checkpoint control in response to DNA damage 5. Pathogenic variants in MORC2's ATPase module cause developmental disorders characterized by intellectual disability, growth retardation, and neuropathy, with some cases showing Leigh syndrome-like brain lesions 1. MORC2 thus functions as a multi-functional epigenetic regulator integrating chr22 remodeling, transposable element silencing, and DNA damage surveillance mechanisms.