›› 2015, Vol. 42 ›› Issue (12): 3167-3172.doi: 10.16431/j.cnki.1671-7236.2015.12.009

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Sequencing and Phylogenetic Analysis of ITS and 5.8S rDNA of Ascaridia galli Isolated from Liangshan

HAO Gui-ying, HE Xue-qian   

  1. School of Animal Science of Xichang College, Xichang 615013, China
  • Received:2015-05-12 Online:2015-12-20 Published:2015-12-30

Abstract: The internal transcribed spacer (ITS) and 5.8S ribosomal DNA (5.8S rDNA) of roudworm (Ascaridia galli, A.galli) samples collected from Liangshan,Sichuan were amplified by PCR using a pair of conserved primers (BD1 and BD2),then sequenced and analyzed the sequences,phylogenetic trees based on ITS-1 and ITS-2 were reconstructed using Mega 5.0 software.The results showed that ITS and 5.8S rDNA sequences of Ascaridia galli were 974 to 989 bp,with homology among these sequences was 98.9% to 100.0%.The sequences of ITS-1,5.8S rDNA and ITS-2 were 473 to 481,157 and 337 to 359 bp,respectively.With homologies of 98.5% to 100.0%,100.0% and 98.5% to 100.0%,respectively.The phylogenetic trees showed that all the Ascaridia galli isolates were formed the same cluster,and could identify with other Ascaridida.The results indicated that there was no significant variation in ITS-1 and ITS-2 sequences within Ascaridia galli,while inter-species difference was obvious,so they could be used as genetic marker to identify the species of Ascaridia galli,and provided the foundation for further research on molecular classification,epidemiological survey and population genetics of Ascaridia galli.

Key words: Ascaridia galli; ITS; 5.8S rDNA; phylogenetic tree

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