鸭圆环病毒全基因组克隆与序列分析

Genome Cloning and Sequence Analysis of Duck Circovirus

为研究鸭圆环病毒全基因组的分子生物学特性,运用重叠PCR技术从鸭组织脏器提取的DNA中扩增出2条核苷酸序列,拼接后对其核酸组成、基因组结构及病毒的遗传变异进行分析。结果表明所获病毒核酸为大小1995nt的环型DNA,包含6个ORF,与登录在GenBank中克隆株MuDCV(AY228555)的同源性高达97·4%,可见所扩增的核酸序列为鸭圆环病毒基因组序列。

To reveal the molecular biological characteristics of genome of circovirus in infected ducks, two nucleotide fragments were amplified by overlapping PCRs using DNA extracted from various tissues of ducks. After they had been assembled together, the nucleotide components, the genome organization and the phylogenetic scale of the sequence were analyzed. The results showed that the obtained sequence is a circular DNA with a total length of 1995nt. It contains 6 open reading frames （ORFs）, and shares a high identity of 97.4% with the MuDCV circovirus sequence presented in GenBank （AY228555）. These results indicate that the amplified product stems from duck circovirus sequence.