Detailed Description of Services and Fees
The prices quoted below are for members of the UPenn community. They are one third to one half lower than those for comparable commercial services. Prices for non-Penn members are somewhat higher (please inquire). The client’s lab has always the option to perform any of the steps themselves with a corresponding diminution in the Core charge. determine the price for a specific project, especially if it is complex in nature and requires multiple services, it is best to obtain a quote from Dr. Raabe, the Core Director.
Initial consulting for a project: Free of charge.
We recommend that all parties involved in a new project meet with the Core director so as to maximize the overall strategy and be sure that the approach is consistent with the needs of the project. These meetings typically last 30-60 min.
Establishment of molecular map of a targeting vector:
The molecular map is put together based on the preexisting basic biological design of the vector. For establishment of the molecular map there is a flat fee of $1,500 (this fee also covers final quality control of the finished vector by restriction enzyme analysis and sequencing). The basic biological design of the vector takes into account the structure of the gene and exon(s) to be targeted and the mutation to be introduced (floxed alleles, any type of deletion or knockin mutation). For relevant scientific expertise of Core personnel in gene targeting and regulation of gene expression please consult these publications.
Construction of a targeting vector:
The final price of constructing the targeting vector in the Core will depend on the number and nature of cloning steps. This is usually in the range of $3,000 - $6,000. BAC recombineering is used for construction in the majority of cases to ensure long arms of homology. If outside vendors are used for construction, vendors charges will apply. The decision whether to use outside vendors or the UPenn Core is taken jointly by the client’s lab and PGT after thorough discussion of the technical specifics and optimal timing of the project. In some cases synthesis of up to 3000 nt DNA fragments may be required. PGT has extensive experience using synthetic DNA for vector construction. PGT has extensive experience in the construction of all types of targeting vectors, including those introducing knockin mutations, reporter cassettes, stop cassettes and floxed alleles. In addition, vectors targeting tissue and/or drug-inducible transgenes to specific loci, including the Rosa 26 locus, can be constructed.
Electroporation and selection of ES cells:
$5,800 for V6.5 ES cells (C57BL6 x 129 Sv), R1 ES cells (129 Sv x 129 SvJ) and TL1 ES cells (129 SvEvTac) or $6,800 for C57B/6 ES cells. We usually pick 192 clones for further screening (from two 96 well plates). Germline transmission is guaranteed for the V6.5 ES line as long as the targeted allele does not cause embryonic lethality. We will not charge additional fees to obtain germline transmission if it cannot be obtained after injection of at least three independent clones. All the above cell lines have been extensively tested for germline transmission: For the V6.5 C57BL6 x 129 Sv hybrid line > 80% of injected ES clones go germline. In addition, PGT has developed improved growth conditions for C57BL6 ES cells. PGT routinely achieves rates of germline transmission for this desirable but technically challenging mouse background that are comparable to the rates for some 129 ES cells (about 55 % for a single C57BL6 ES clone). For detailed documentation on germline transmission rates of our C57BL6 ES cell lines please click here.
Identification of homologous recombinant ES clones using Southern and PCR:
Design and testing of suitable Southern blot probes to detect correct insertion of the targeting vector along its entire length and at least one genomic PCR primer pair to detect the presence of a targeted mutation: Flat price of $1,700 if only one Southern probe and one genomic PCR primer pair are is needed. $2,700 if two working Southern probes (binding just outside of opposite sides of the integrated vector) and one genomic PCR primer pair are required.
Southern screening, including isolation of genomic DNA:
For 40 ES clones: $1,600. Without isolation of genomic DNA: $1,000. Usually we obtain between 5 and 30 initial positive clones. For certain targeted genes targeting efficiency is naturally low due to epigenetic / structural issues at the targeted locus. If an electroporation must be repeated for this reason we will charge only 70% of the original price for the electroporation.
Cytogenetic analysis of recombinant ES cell clones:
$650 per clone:
The chromosome number of a minimum of 10 metaphases is determined by fluorescent microscopy. All images are stored digitally and are available to the client.
Expansion of homologous recombinant ES clones for injection into blastocysts followed by preparation of single cell suspension for exactly timed delivery to the Transgenic Core:
$550 per clone if ES clones were generated at the Core and $690 if they were generated outside.