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A simplified method to prepare PCR template DNA for screening of transgenic and knockout mice
1Institute of Human Virology, Division of Infectious Diseases, Department of Medicine and the University of Maryland Medical School, Baltimore, Maryland 21201, USA.
Abstract:
Polymerase chain reaction (PCR) amplification of DNA is the most widely used technique for screening of large numbers of genetically engineered transgenic or knockout mice (Mus musculus). In this report, we present a new DNA preparation procedure for running diagnostic PCR. In this procedure, mouse ear tissue was used directly for PCR after the tissue underwent brief digestion in a solution containing only proteinase K. Using this method, we have successfully screened several lines of single, double, and triple transgenic and knockout mice. The results are reliable and reproducible. The advantage of this new method is that DNA purification by organic extraction or isolation kit was omitted. DNA purification is the limiting factor in terms of time and money when screening transgenic and knockout mice by PCR. In addition, using ear instead of tail tissue can reduce distress of animals because the samples can be obtained when the mice are labeled by ear punch.
Insights
We developed a faster, cheaper DNA preparation method for screening genetically engineered mice using polymerase chain reaction (PCR). Mouse ear tissue is digested directly, eliminating DNA purification steps for reliable results.
Area of Science:
- Molecular Biology
- Genetics
- Animal Models
Background:
- Polymerase chain reaction (PCR) is essential for screening genetically engineered mice.
- Traditional DNA preparation is time-consuming and costly, often involving organic extraction or isolation kits.
- Screening large numbers of transgenic and knockout mice requires efficient DNA preparation methods.
Purpose of the Study:
- To introduce a simplified DNA preparation procedure for diagnostic PCR in mice.
- To reduce the time and cost associated with screening transgenic and knockout mouse lines.
- To offer a less invasive method for sample collection compared to traditional tail snips.
Main Methods:
- Directly using mouse ear tissue for PCR.
- Brief digestion of ear tissue in a proteinase K solution.
- Omitting organic extraction or commercial DNA isolation kits.
Main Results:
- Successfully screened multiple lines of single, double, and triple transgenic and knockout mice.
- Achieved reliable and reproducible results using the simplified method.
- Demonstrated the feasibility of using ear tissue for DNA preparation, reducing animal distress.
Conclusions:
- The new method significantly streamlines DNA preparation for PCR-based screening of genetically engineered mice.
- Eliminating DNA purification steps saves time and resources.
- Utilizing ear tissue offers a more humane approach to sample collection in mouse research.