Nucleic Acid Amplification

Nucleic acid amplification technologies copy specific DNA or RNA sequences from biological samples millions of times. They generate detectable quantities of target genetic material from trace starting amounts. Furthermore, these technologies underpin molecular diagnostics, forensic profiling, infectious disease surveillance, and research genomics across laboratory and point-of-care settings.

Polymerase chain reaction (PCR) is the most widely deployed amplification method. It uses thermal cycling to denature double-stranded DNA. Primers then anneal to sequences flanking the target region. A thermostable polymerase extends new complementary strands from each primer. Each cycle doubles the target sequence count. As a result, over one billion copies generate from a single starting molecule after 30 cycles. Moreover, real-time quantitative PCR (qPCR) measures amplification product accumulation in each cycle using fluorescent probe chemistries. This generates quantitative data on starting copy number without post-amplification gel electrophoresis.

Isothermal amplification methods operate at a single fixed temperature. They eliminate thermal cycling equipment entirely. Loop-mediated isothermal amplification (LAMP) uses four to six primers and a strand-displacing polymerase at 60 to 65°C. It completes amplification in 15 to 30 minutes. Additionally, recombinase polymerase amplification (RPA) operates at 37 to 42°C in under 20 minutes. This approaches body temperature, enabling reactions without laboratory heating equipment. Furthermore, nucleic acid sequence-based amplification (NASBA) amplifies RNA targets directly at 41°C, without a reverse transcription step.

Digital PCR (dPCR) partitions samples into thousands of individual nanoliter reactions. It counts positive and negative partitions after amplification. This delivers absolute target molecule counts without standard curves — directly supporting clinical copy number measurement and rare mutation detection in oncology applications.

These technologies serve Pakistan’s hospital diagnostic laboratories, forensic DNA units at PFSA and FIA, public health surveillance programs, Shaukat Khanum molecular oncology programs, and university molecular biology departments in Lahore, Karachi, and Islamabad.

Tactical Supply Pakistan supplies nucleic acid amplification instruments, reagents, and consumables for clinical diagnostics, forensic profiling, and molecular research procurement across Pakistan.