MYSM1 Knockout HAP1 Cell Line

The choice depends on whether you are studying MYSM1's role as the principal histone H2A K119 deubiquitinase or modeling MYSM1-deficiency immunodeficiency. The Knockout line is the standard tool for asking whether MYSM1 is required for these activities — MYSM1 (Myb-like, SWIRM and MPN domains 1) is a JAMM/MPN+ family DUB that removes monoubiquitin from H2A K119 (the PRC1-deposited mark), promoting transcription activation at MYSM1-target loci. Overexpression is useful for studying MYSM1 in heterologous expression contexts. For chromatin biology and immunodeficiency research, the EDITGENE MYSM1 Knockout in HAP1 enables study of H2A K119 deubiquitination biology. MYSM1 biallelic loss-of-function mutations cause bone marrow failure with B-cell lymphopenia and developmental abnormalities (MYSM1-deficiency syndrome) — disease variant rescue enables genotype-function studies. Rescue with wild-type or catalytically-dead (D660N) MYSM1 enables comprehensive structure-function studies.

Primary applications: • H2A K119 monoubiquitination: H2AK119ub1 Western blot and ChIP-seq to characterize MYSM1-dependent deubiquitination at target loci. • MYSM1-deficiency syndrome modeling: rescue with patient-derived MYSM1 mutations for genotype-function studies of bone marrow failure and immunodeficiency. • Substrate identification: ubiquitin remnant proteomics in the knockout to identify candidate MYSM1-dependent deubiquitination events beyond H2A. • Transcriptional regulation: RNA-seq analysis at MYSM1-target genes to characterize MYSM1-dependent transcriptional programs. EDITGENE recommends this model for researchers investigating MYSM1 chromatin biology and MYSM1-deficiency immunodeficiency mechanisms.

Yes. MYSM1 rescue experiments require attention to dual SWIRM-MPN architecture: • Construct design: use a codon-modified MYSM1 sequence with a small C-terminal tag (FLAG, HA). MYSM1 has N-terminal Myb-like SANT domain, central SWIRM domain, and C-terminal MPN catalytic domain (JAMM motif) — preserve all elements. • Catalytically-dead rescue: the D660N mutation in the MPN domain JAMM motif (DxH...HxHx10D) abolishes deubiquitinase activity and is the standard specificity control. • MYSM1-deficiency mutation rescue: patient-derived MYSM1 mutations enable disease genotype-function studies. • Functional readout: rescue should restore H2A K119 deubiquitination at MYSM1 target loci. HAP1-specific considerations: • Diploidization: HAP1 cells gradually diploidize during extended culture — confirm ploidy by flow cytometry at the time of phenotypic assay. • Integration site sensitivity: position effects on transgene expression are more pronounced in near-haploid backgrounds; generating multiple independent rescue clones is strongly recommended. • Transduction efficiency: HAP1 transduces with lentivirus at moderate efficiency — increase MOI compared to standard immortalized lines.