A Protocol for Rapid and Inexpensive Genotyping of Mutant Mice from Dried Blood Spots: An Update

Abstract Background: Dried blood spot (DBS) testing is a well-known method of bio-sampling by which blood samples are blotted and dried on filter paper. The dried samples can then be analyzed by several techniques such as DNA amplification and HPLC. We have developed a homemade DBS method followed by an alternative protocol for genomic DNA extraction from a drop of blood adsorbed on paper support. This protocol consists of two separate steps: (1) organic DNA extraction from the DBS, followed by (2) DNA amplification by polymerase chain reaction (PCR). The PCR-restriction fragment length polymorphism (PCR-RFLP) is an advantageous and simple approach to detect single nucleotide polymorphisms (SNPs). Results: We have evaluated the efficiency of our method for the extraction of genomic DNA from DBS by testing its performance in genotyping mouse models of obesity and herein discuss the sensitivity, specificity and feasibility of this novel procedure. Conclusions: Our protocol is easy to perform, fast and inexpensive and allows the isolation of pure DNA from a miniscule amount of sample.