Egl, with defects in HSN migration, and HSN and PVQ axon guidance. Crispr/Cas9 induced mutation in Ring1 domain with epigenetic effects on neurodevelopment. Amino acid substitution that likely disrupts interaction with a specific substrate, resulting in a phenotype comparable to a complete gene deletion. Reference: Pierce SB, et al. Proc Natl Acad Sci U S A. 2018 Feb 13;115(7):1558-1563.