DNA Sequencing

DNA Sequencing is the analytical process determining the precise order of nucleotides (adenine, guanine, cytosine, thymine) comprising DNA molecules enabling forensic identification, disease mutation detection, and genetic characterisation. The sequencing approach provides genetic information at maximum resolution enabling definitive individual identification and genetic diagnosis.

DNA sequencing methodologies span Sanger sequencing through automated capillary electrophoresis generating 600–1000 nucleotide reads with >99.9% accuracy suitable for targeted genetic analysis, and next-generation sequencing (NGS) employing massive parallel analysis generating millions of reads simultaneously enabling comprehensive genome coverage. Sanger sequencing costs more per base pair but requires simpler sample preparation. NGS costs less per base pair but requires sophisticated bioinformatic analysis.

Forensic applications employ STR (short tandem repeat) sequencing generating DNA fingerprints enabling definitive suspect identification through matching against CODIS databases. Mitochondrial DNA sequencing enables identification of degraded remains when nuclear DNA is unavailable. Medical applications detect disease-causing mutations informing therapeutic decisions and genetic counselling. Microbial applications identify pathogens guiding infection management.

Operational procedures involve DNA sample preparation, library construction fragmenting DNA into appropriately-sized pieces, sequencing reactions amplifying fragments with labelled nucleotides, and automated data collection. Real-time analysis provides progressive results without requiring complete sequencing before interpretation.

Data analysis employs sequence alignment comparing unknown sequences against reference genomes identifying variants. Statistical analysis provides confidence estimates.

In Pakistan, DNA sequencing supports forensic analysis and medical diagnostics.

Tactical Supply Pakistan supplies DNA sequencing services for forensic and diagnostic analysis applications.