2.1. DNA extraction from FAdV-4 and polymerase chain reaction
(PCR) of the hexon gene
FAdV-4 was adapted in chicken embryo liver (CEL) culture and
purified virus was used for DNA extraction using DNA isolation kit
(Bangalore Genie, India; Cat No. 107822) following manufacturer’s
instructions. PCR amplification of partial hexon gene of FAdV-4
was done using the primers designed for an immunodominant
coding sequence of hexon gene (737 bp) spanning 1792–2485 bp
from the total hexon gene sequence (2916 bp; Gene Bank Accession
No.AJ554049)using DNAstar software (Laser gene), restriction
endonuclease sites (Pst1 and BamH1) were incorporated for directional
cloning. The primer sequences were as follows: F: 5 AAA CCT
GGA TCCCGACGG CGCCAACATCATCTA3
;R: 5 GATAAC TGC AGG
AGT TGT TGC GAA CGG CTT CCT 3
. PCR amplification was carried
outin a thermocycler (AB System, USA) with an initial denaturation
at 94 ◦C for 5 min followed by 30 cycles of denaturation at 94 ◦C for
1 min; annealing at 57 ◦C for 1 min and extension at 72 ◦C for 2 min
with a final extension of 72 ◦C for 10 min.
2.