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An effective alternate cloning strategy for unstable mouse genomic sequences
Michael S Lan1, Michelle Muguira
1The Research Institute for Children, Children's Hospital, Department of Pediatrics, Louisiana State University Health Sciences Center, New Orleans, LA 70118, USA. mlan@chnola-research.org
Biochemical and Biophysical Research Communications
|April 6, 2005
Summary
Cloning unstable mammalian genomic DNA, like the INSM1 gene, into bacterial vectors often causes rearrangements. A single-copy cloning technique effectively prevents these DNA recombination events during the cloning process.
Area of Science:
- Molecular Biology
- Genomics
- Bacterial Genetics
Background:
- Mammalian genomic sequences can be unstable during bacterial cloning.
- Spontaneous rearrangements pose challenges for gene studies, particularly for genes like INSM1.
Purpose of the Study:
- To investigate methods for preventing spontaneous DNA rearrangement of unstable mammalian genomic sequences during bacterial cloning.
- To identify an effective cloning strategy for the Insulinoma-Associated 1 (INSM1) gene.
Main Methods:
- Subcloning of flanking sequences of the INSM1 gene into a targeting vector.
- Testing recombinase-free Escherichia coli strains and altered incubation temperatures.
- Evaluating the effect of co-transformation with a methyltransferase vector (pAIT2).
- Implementing a single-copy cloning technique.
Main Results:
- Subcloning of INSM1 gene flanking sequences resulted in spontaneous rearrangement.
- Recombinase-free cells, lower temperatures, and DNA methylation failed to prevent recombination.
- The single-copy cloning technique successfully cloned unstable mouse genomic DNA without rearrangement.
Conclusions:
- Standard bacterial cloning methods are insufficient for unstable mammalian genomic DNA.
- A single-copy cloning technique provides a reliable method for cloning unstable DNA sequences, crucial for gene deletion studies and other genetic manipulations.