DNA Extraction and PCR Detection of G.Lamblia Cyst from Human Fecal Samples in Some Sudanese Suspected Patients

The study aim to evaluate guanidine hydrochloride (HCL) as DNA extraction method from Giardia Cyst in human fecal samples and PCR detection using triose phosphate isomerase gene (tpi). Atotal of 30positive fecal samples of Giardia were collected from Hospitals and health centers from three states of Sudan (Khartoum, Gazeira and Sennar) during the periods from June to September 2017 by Convenient sampling method the samp!es were purifid in Phosphate buffer saline , treated with Liquid Nitrogen and boiling, then guanidine hydrochloride method was used for DNA extraction 1ml of sample added to 1ml lysis buffer ,1ml guanidine hydrochloride , 300μl ammonium acetate, and 10μl proteinase K and incubated in 37 C over night, DNA was harvested, confirmed and evaluated by Nanodrops can, and spectrophotometr for concentration, then followed by PCR detection, using ready prepared commercial product (Maxime PCRPriMex (i-Taq 20μl) Macro gene Company, Korea). In the reaction 1.5μl forwards and 1.5μl reverse primer were add to 5μl DNA template and complete the volume to 20μl with sterile D. W. the reaction was conducted in 94°C for 5min as initial temperature 94°C for 30 sec, 55°C for 45 sec, 72°C for 2min, 72°C for The result found that DNA concentration was 34.5000±2.1213ng/m 62.4000±0.56569ng/ml 4.6800±1.46803ng/ml for Khartoum, Sennar, and Gazeira states while PCR only 5samples were+ve 2 (20%) samples Khartoum and 3 (30%) samples Sennar states but no+ve PCR result in Gazeira state. which confirmed by agarose gel electrophoresis,the sdudy conclude that chemical methods of DNA extraction for examples guanidine HCL is not less effective than other, and PCR it is high sensitive to inhibitors. Also it is possible to obtain DNA from G.cyst after treated with heat and liquid nitrogen