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Four DNA fragments (fragments A, B, C and D) covering the whole genome of chicken anemia virus (CAV) were amplified enzymatically by polymerase chain reaction (PCR) using four pairs of oligonucleotide primers. The DNA fragments were amplified from each of nine CAV isolates including eight Malaysian isolates and one European isolate (Cux-1). For all nine CAV isolates, fragment A (1518 bp) was digested with one restriction enzyme, Eco 130I ( Sty I); fragment B (926 bp) with three enzymes, Eco 130I ( Sty I), Hpa II and Mbo I separately; fragment C (675 bp) with also three enzymes, Bsu RI ( Hae III), Hin fI, and Hpa II separately; and the fragment D (552 bp) with one enzyme, Eco RI. Enzyme digested products of different fragments were separated by agarose gel or polyacrylamide gel electrophoresis. Each of the eightenzymatic reactions differentiated at least two isolates except the Hpa II digestion of fragment C where no isolate was distinguished. The overall restriction endonuclease (RE) analysis separated four isolates (BL-1, BL- 2, BL-4 and BL-5) in one group and the rest five isolates (SMSC-1, SMSC-2, 3-1, BL-3 and Cux-1) were differentiated from each other and also from the group of four isolates, based on the number of restriction site differences and the fragments generated by different enzymatic digestions. The study revealed that RE analysis could be used to identify and differentiate CAV isolates based on the number of restriction site differences. The study showed that more isolates, even the isolates from the same poultry farm, could be differentiated with proper genomic diversity after RE analysis of more genome fragments compared to that of single genome fragment. SAARC J. Agri., 15(2): 1-18 (2017)

Restriction endonuclease analysis of the genomes of different isolates of chicken anemia virus amplified by polymerase chain reaction