What is a mini-STR analysis and when is it advantageous?

What is a mini-STR analysis and when is it advantageous?

• A. Uses longer amplicons to improve specificity.
• B. Requires intact DNA only.
• C. Amplifies mitochondrial DNA exclusively.
• D. Targeting shorter amplicons; advantageous for degraded or compromised DNA.

Answer: (D)

Mini-STR analysis focuses on amplifying shorter DNA fragments around STR loci. This makes it especially useful when DNA is degraded or compromised because shorter target regions are more likely to remain intact and amplifiable, whereas longer regions often break apart and fail to amplify. By prioritizing these shorter amplicons, you’re more likely to recover usable STR data from samples like aged bones, heat-damaged evidence, or low-quantity DNA, even if the overall DNA quality isn’t ideal. It uses nuclear STR markers, not mitochondrial DNA, and the advantage isn’t about needing intact DNA in the absolute sense but about the fragment length that can be reliably amplified in degraded material.