Although the analysis of length polymorphism at short tandem repeat (STR) loci has become a method of choice for grape cultivar identification, the standardization of methods for this purpose lags behind that of methods for DNA profiling in human and animal forensic genetics. The aim of this study was thus to design and validate a grapevine STR protocol with a practically useful level of multiplexing.
Using free bioinformatics tools, published primer sequences, and nucleotide databases, we constructed and optimized a primer set for the simultaneous analysis of six STR loci (VVIi51, scu08vv, scu05vv, VVMD17, VrZAG47, and VrZAG83) by multiplex PCR and capillary electrophoresis with laser induced fluorescence, and tested it on 90 grape cultivars. The new protocol requires sub-nanogram quantities of the DNA template and enables automated, high-throughput genetic analysis with reasonable discriminatory power. As such, it represents a step towards further standardization of grape DNA profiling.
Keywords: Short tandem repeats; grapevine DNA analysis; multiplex PCR; Vitis vinifera L