[Study on molecular phylogeny of Schistosoma sinensium based on mitochondrial genes].
OBJECTIVE
To determine the phylogenetic position of Schistosoma sinensium in the genus Schistosoma using mitochondrial cytochrome C oxidase 1 (CO1) and NADH dehydrogenase 1(ND1) as molecular markers.


METHODS
The genomic DNA of adult worms were extracted by the GNT-K method. The target regions were amplified by PCR using specific primers. The PCR products were purified before ligation into the plasmid Zero-Blunt. Recombinant plasmids were amplified in E. coli, extracted and purified using routine methods and then sequenced using M13 primers (F/R) on a Licor long-read auto-sequencer. Sequences of related schistosomes were retrieved from GenBank and aligned with our data in the sequence editor ESEE. Gene trees were constructed in PHYLIP and MEGA using both maximum parsimony and neighbor-joining methods. For parsimony analysis, all characters were treated as unordered and with equal weights. At least 3,000 cycles of bootstrapping were carried out. For analysis in MEGA, all gap columns were deleted. The third position of codon was included.


RESULTS
The nucleotide and amino acid sequences of CO1 and ND1 of S. sinensium were obtained.


CONCLUSIONS
The phylogenetic trees from these molecular data suggested that S. sinensium belongs to the Asian schistosome group, and the results coincided with the previous rDNA (ITS2 & LSU) analysis results.
Zhang
Guang-jun
GJ
Institute for Parasitic Disease Control and Prevention, Chinese Center for Disease Control and Prenention, Shanghai 200025.
Qiu
Chi-ping
CP
Qiu
Dong-chuan
DC
Xia
Ming-yi
MY
D000818:Animals; D003576:Electron Transport Complex IV / Q000737:chemistry / Q000235:genetics; D050259:Genes, Mitochondrial; D009245:NADH Dehydrogenase / Q000737:chemistry / Q000235:genetics; D010802:Phylogeny; D012547:Schistosoma / Q000145:classification* / Q000235:genetics
D009245:NADH Dehydrogenase; D003576:Electron Transport Complex IV