Analysis of 30 Biallelic INDEL Markers Using the Investigator DIPplex® Kit

Bashir, Majid and Hassan, Nur Haliza Bt (2016) Analysis of 30 Biallelic INDEL Markers Using the Investigator DIPplex® Kit. In: Forensic DNA Typing Protocols. Methods in Molecular Biology, 1420 . Springer, Humana Press, New York, NY, pp. 135-142. ISBN 978-1-4939-3595-6

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Insertion/deletion polymorphisms (INDELs) are a relatively new class of a DNA marker to be used in forensic casework; used most commonly as a supplementary method to STR-based typing. INDELs, like SNPs, are particularly useful for the analysis of highly degraded DNA as the amplicon sizes are typically below 160 bp; they can also be valuable as an additional tool to help resolve kinship cases, with the advantage over STRs that they do not have high mutation rates. INDELs have an advantage over SNPs in that they are length polymorphisms and so can be analyzed by simply measuring the length of the allele(s). The Qiagen Investigator® DIPplex Kit is currently only one of two commercially available kits for the amplification of INDEL polymorphisms; it amplifies 30 biallelic INDEL loci and the amelogenin locus. The primers used are fluorescence labeled with 6-FAM, BTG, BTY, and BTR. This technique is robust, relatively simple, and the results are analyzed using the same capillary electrophoresis equipment and software as used for STR typing.

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