Mos1 transposase with synthetic intron from Drosophila mauritiana
Engineered DNA transposase from the Tc1/mariner superfamily optimized for C. elegans applications through synthetic intron insertion. Mobilizes transgenes via cut-and-paste mechanism targeting TA dinucleotides. Enables targeted single-copy insertions at defined genomic loci and supports cargo up to 45 kb for stable transgene integration without viral vectors.
Origin: Engineered from Drosophila mauritiana Mos1 element
Characteristics
Catalyzes precise excision and genomic integration via cut-and-paste mechanism targeting TA dinucleotide sites, which are duplicated upon insertion. Recognizes and binds to Mos1 terminal inverted repeats (TIRs) flanking transposon cargo. Synthetic intron insertion enhances transposase expression in C. elegans germline, improving mobilization efficiency. Supports large cargo capacity up to 45 kb transgenes while maintaining transposition activity. Active in C. elegans germline with optimized expression from heat-shock or germline-specific promoters. Lower transposition activity in mammalian cells compared to piggyBac or Sleeping Beauty transposons.
Applications: Targeted single-copy transgene insertion at defined genomic loci in C. elegans for functional genomics. Insertional mutagenesis screens for forward genetics and gene discovery. Generation of stable transgenic C. elegans lines with large constructs including fosmids and genomic fragments. Mos1-mediated deletion and genome engineering via targeted excision. Alternative to extrachromosomal arrays for stable, heritable transgene expression without silencing. Widely used with MosSCI (Mos1-mediated Single Copy Insertion) system for reproducible transgene integration.
Limitations: Restricted primarily to C. elegans applications with limited activity in other organisms. Transposition efficiency substantially lower than piggyBac or Sleeping Beauty systems in mammalian cells. Requires co-delivery of both transposon and transposase components for activity. Insertion shows preference for TA-rich regions rather than completely random genomic distribution. Transposon footprint may remain at excision sites in some contexts. Lower cargo capacity compared to some viral vectors for very large genomic constructs.