DNAprofileringsanalyse

DNAprofileringsanalyse refers to the laboratory process of generating and interpreting a DNA profile from biological material to identify individuals or determine relatedness. The analysis typically focuses on specific genetic markers that vary among individuals, most commonly short tandem repeats (STRs). Depending on the purpose, other marker types such as mitochondrial DNA (mtDNA) sequences or single nucleotide polymorphisms (SNPs) may be used. The process generally involves DNA extraction, amplification of chosen loci by polymerase chain reaction (PCR), and separation and detection of the amplified fragments, often by capillary electrophoresis. The resulting profile is compared to reference samples or entered into a database to assess the strength of a potential match.

Interpretation uses statistical calculations such as random match probability or likelihood ratios, taking into account population genetics, mixture analysis, and potential degraded samples. Quality control, chain of custody, and laboratory accreditation are essential to ensure reliability.

Applications include forensic casework, paternity and kinship testing, disaster victim identification, and historical or anthropological research. In forensic databases, profiles may be stored to aid future matches, raising privacy and civil liberty concerns. National and international guidelines and standards (for example ISO/IEC 17025, and guidance from SWGDAM or ISFG) govern laboratory practices and reporting.

Limitations include incomplete or mixed DNA, contamination, or degraded samples affecting interpretability. The technique cannot determine phenotype or motive; ethical considerations require consent, data protection, and regulated use.