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Mouse CRISPR/Cas9 mRNA Microinjection

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Resource Type

  1. Material modification service


  1. Fee for service
  2. Resource Description
    The conventional and traditional method for creating gene targeted mice was to induce a site-specific mutation in mouse embryonic stem (ES) cells, then microinject the ES cells into blastocysts (see ES cell Microinjection). This work is extremely laborious and expensive. Genetic modification technology has evolved and the bacterial method of genetic repair has been adopted, as a faster and cheaper method for creating gene target mutations in animals. This newly adopted system is referred to as the CRISPR/Cas9 method. This technology consists of two main components; the guide RNA (gRNA) that binds to DNA and the enzyme Cas9, which cuts the DNA at a specific location. Once a cut has been made it is possible to:; insert, delete, or alter a specific sequence of interest. Microinjecting Cas9 mRNA into zygotes is the preferred method for large gene sequence modifications or conditionals mutations. While some labs may prefer to prepare their own CRISPR reagents, we can also recommend utilizing the Penn School of Medicine CRISPR/Cas9 Mouse Targeting Core or ordering the guides through a commercial vendor such as IDT. While success rates may vary for each gene target region, there have been no lines that we were unable to generate founder animals. The average success rate for microinjections is 30%. Your mRNA will be injected directly into the cytoplasm of a minimum of 150 fertilized 0.5d.p.c. zygotes. This can be performed in a wild-type strain, or existing mutant strain. The mRNA is loaded into the ultra-fine injection needle, and using a constant, regulated flow of pressure is injected into each zygote. Following an incubation period, the surviving zygotes are surgically transferred into the reproductive tract of 0.5day pseudo-pregnant surrogate females. When the offspring reach 10-14 days old they will be tail snipped, the tissues will be delivered to your lab and screened for integration of the mRNA sequence. Mice identified with the correct sequence are considered the founders, or F0, these will be transferred to your animal holding room, where they can be bred to expand the line for experimental use. The facility will schedule your strain production requests on a first-come, first-served basis. We will attempt to accommodate any strain background requests, but please be aware that hybrid strains tend to work better than inbred strains.
  3. Service Fee URL
  4. Service Provided by
    Transgenic Core (CHOP)
  5. Website(s)
Provenance Metadata About This Resource Record
  1. workflow state
  2. contributor
    ggrant (Gregory Grant)
  3. created
  4. creator
    ggrant (Gregory Grant)
  5. modified
Copyright © 2016 by the President and Fellows of Harvard College
The eagle-i Consortium is supported by NIH Grant #5U24RR029825-02 / Copyright 2016