Msi1 CRISPR/Cas9 KO Plasmid (h2): sc-404014-KO-2

Overview

MSI1 encodes Musashi RNA-binding protein 1 (Msi1), a conserved post-transcriptional regulator that controls mRNA stability and translation through sequence-specific binding in 3′ UTRs. Msi1 helps coordinate cell-state programs including stemness, proliferation, and differentiation by modulating signaling nodes commonly linked to Notch and Wnt/β-catenin pathways and cell-cycle regulators. In human biology, altered MSI1 expression has been associated with dysregulated progenitor cell maintenance and aberrant lineage commitment in multiple tissue contexts. These properties make MSI1 a widely used target for investigating RNA regulons, developmental gene expression programs, and mechanisms of oncogenic signaling rewiring.

Msi1 CRISPR/Cas9 KO Plasmid (h2) is a pool of plasmids designed for targeted disruption of the MSI1 gene in human cell lines. Each plasmid in the pool co-expresses a unique sgRNA, targeting a distinct site within the MSI1 locus, alongside the Streptococcus pyogenes Cas9 nuclease, and encodes GFP to enable fluorescent identification and enrichment of successfully transfected cells. This multi-guide strategy increases the likelihood of inducing frameshifts or deletions that produce a functional knockout, offering a more robust alternative to single-guide approaches. DSBs induced at multiple sites are resolved through non-homologous end joining (NHEJ) or, when used with the included HDR donor template, homology-directed repair (HDR) at a defined target site within the locus.

When used in conjunction with the RFP-expressing HDR donor, GFP and RFP fluorescence can be used together to distinguish transfected from edited cell populations, streamlining flow cytometry-based sorting and clone selection workflows.

Homology-Directed Repair (HDR) Donor — Puromycin Cassette with RFP Reporter

For applications requiring confirmed, selectable knockout clones, Msi1 HDR Plasmid (h2) includes an HDR donor construct containing a puromycin resistance cassette (PuroR) and a red fluorescent protein (RFP) reporter, flanked by homology arms specific to a defined MSI1 target site.
When co-transfected with Msi1 CRISPR/Cas9 KO Plasmid (h2):

• The PuroR-RFP cassette integrates at the Cas9 cut site via HDR, disrupting the MSI1 open reading frame.
• RFP fluorescence provides an immediate visual indicator of successful integration, enabling fluorescence-based identification or sorting of edited cells prior to or alongside puromycin selection.
• Successfully edited cells are confirmed through puromycin resistance, substantially reducing clone screening burden.
• This selection strategy is ideal for generating stable, clonal KO cell lines for downstream functional studies, drug screening, or model development.

Cre-lox Cassette Removal System

The HDR donor construct features loxP sites flanking the PuroR-RFP selection cassette to allow clean marker removal following clone confirmation. Transient expression of Cre recombinase via the included Cre Vector: sc-418923 excises the cassette, leaving a minimal residual loxP site within the MSI1 locus and eliminating potential confounding effects on downstream assays.
This two-step approach:

• Minimizes disruption to local chromatin architecture and neighboring regulatory elements
• Restores a near-native genomic context at the edited locus
• Enables reuse of the puromycin selection strategy in the same cell line for additional edits

Key Features

• gRNA targeting MSI1 exon(s) critical for Msi1 function
• Co-expression of SpCas9 and sgRNA from a single plasmid for simplified delivery
• HDR donor with puromycin resistance for positive clone selection
• loxP-flanked PuroR cassette with Cre recombinase vector for seamless marker removal
• Supplied ready to use for delivery by transfection

For Research Use Only. Not Intended for Diagnostic or Therapeutic Use.