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Validation of a Short Tandem Repeat Multiplex Typing System for Genetic Individualization of Domestic Cat Samples

Overview
Journal Croat Med J
Specialty General Medicine
Date 2007 Aug 19
PMID 17696310
Citations 8
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Abstract

Aim: To conduct developmental validation studies on a polymerase chain reaction (PCR) based short tandem repeat (STR) multiplex typing system, developed for the purpose of genetic individualization and parentage testing in domestic cat samples.

Methods: To evaluate reproducibility of the typing system, the multiplex was amplified using DNA extracted from hair, blood, and buccal samples obtained from the same individual (n=13). Additional studies were performed to evaluate the system's species' specificity, using 26 North American mammalian species and two prokaryotes Sacchromyces and Escherichia coli, sensitivity, and ability to identify DNA mixtures. Patterns of Mendelian inheritance and mutation rates for the 11 loci were directly examined in a large multi-generation domestic cat pedigree (n=263).

Results: Our studies confirm that the multiplex system was species-specific for feline DNA and amplified robustly with as little as 125 picograms of genomic template DNA, demonstrating good product balance. The multiplex generated all components of a two DNA mixture when the minor component was one tenth of the major component at a threshold of 50 relative fluorescence units. The multiplex was reproducible in multiple tissue types of the same individual. Mutation rates for the 11 STR were within the range of sex averaged rates observed for Combined DNA Index System (CODIS) loci.

Conclusion: The cat STR multiplex typing system is a robust and reliable tool for the use of forensic DNA analysis of domestic cat samples.

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