Where Are Strs Found?
Most Strs Are Found in the Noncoding Regions, While Only About 8% Locate in the Coding Regions (3). Moreover, Their Densities Vary Slightly Among Chromosomes...
Most STRs are found in the noncoding regions, while only about 8% locate in the coding regions (3). Moreover, their densities vary slightly among chromosomes. In humans, chromosome 19 has the highest density of STRs (4). On average, one STR occurs per 2,000 bp in the human genome (5).
Where can I find short tandem repeats?
DNA Separations
Following PCR amplification, the overall length of the STR amplicon is measured to determine the number of repeats present in each allele found in the DNA profile. This length measurement is made via a sized-based separation involving gel or capillary electrophoresis (CE).
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What is an STR in DNA?
Short tandem repeats (STRs) are short repeated sequences of DNA (2–6 bp) that account for approximately 3% of the human genome (Lander et al., 2001). The number of repeat units is highly variable among individuals, which offers a high power of discrimination when analyzed for identification purposes.
Forensic uses. STR analysis is a tool in forensic analysis that evaluates specific STR regions found on nuclear DNA. These STR loci (locations on a chromosome) are targeted with sequence-specific primers and amplified using PCR. The DNA fragments that result are then separated and detected using electrophoresis.
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