The present disclosure provides nucleases and compositions, methods, and systems thereof for nucleic acid modification. More particularly, the present disclosure provides compositions and system comprising a nuclease comprising an amino acid sequence having at least 70% identity, at least 80% identity, at least 90% identity, at least 95% identity or at least 99% identity to any of SEQ ID NOs: 1-23 or 32-35 and at least one gRNA.