RESUMO
We report here a human case of Taenia asiatica infection which was confirmed by genetic analyses in Dali, China. A patient was found to have symptoms of taeniasis with discharge of tapeworm proglottids. By sequencing of the mitochondrial cytochrome c oxidase subunit 1 (cox1) gene, we observed nucleotide sequence identity of 99% with T. asiatica and 96% with T. saginata. Using the cytochrome b (cytb) gene, 99% identity with T. asiatica and 96% identity with T. saginata were found. Our findings suggest that taeniasis of people in Dali, China may be mainly caused by T. asiatica.
Assuntos
Adulto , Animais , Humanos , Masculino , China , Citocromos b/genética , Complexo IV da Cadeia de Transporte de Elétrons/genética , Filogenia , Homologia de Sequência do Ácido Nucleico , Taenia/classificação , Teníase/parasitologiaRESUMO
The 2 species of the genus Anoplocephala (Anoplocephalidae), A. perfoliata and A. magna, are among the most important equine cestode parasites. However, there is little information about their differences at the molecular level. The present study revealed that the mitochondrial (mt) genome of A. magna was 13,759 bp in size and 700 bp shorter than that of A. perfoliata. The 2 species includes 2 rRNA, 22 tRNA, and 12 protein-coding genes each. The size of each of the 36 genes was the same as that of A. perfoliata, except for cox1, rrnL, trnC, trnS2(UCN), trnG, trnH, trnQ, and trnP. In the full mitochondrial genome, the sequence similarity was 87.1%. The divergence in the nucleotide and amino acid sequences of individual protein-coding genes ranged from 11.1% to 16% and 6.8% to 16.4%, respectively. The 2 noncoding regions of the mt genome of A. magna were 199 bp and 271 bp in length, while the equivalent regions in A. perfoliata were 875 bp and 276 bp, respectively. The results of this study support the proposal that A. magna and A. perfoliata are separate species, consistent with previous morphological analyses.
Assuntos
Sequência de Aminoácidos , Cestoides , Genoma , Genoma Mitocondrial , Parasitos , RNA de TransferênciaRESUMO
To obtain the recombinant 18 kD protein with high purity and normal bioactivity of Cysticercus cellulosae (rCE18), E. coli cells with the rCE18 were disrupted ultra-sonically, and the inclusion bodies were washed with a solution containing 0.2% deoxycholic acid sodium (DOC)and 2% DOC, respectively. Then they were denatured with 0.9% sodium lauroyl sarcosine (SKL) followed by dialysis and gel filtration to refold and purify the target protein. At the same time, this method was compared with GST-FF affinity chromatography and recovering from SDS-PAGE gel. Biological activity of purified rCE18 was analyzed with indirect ELISA, and the purity of the products was identified using SDS-PAGE. The purity of refolded inclusion bodies exceeded 60% and the total recovery of activated protein rCE18 was about 41.3%. The specificity of rCE18 reached up to 97.2% using indirect ELISA. An effective way for purifying and refolding rCE18 expressed in E. coli as inclusion bodies was established, rCE18 with higher purity and activity was obtained, which has the potential for developing diagnosis methods of porcine cysticercosis.
Assuntos
Animais , Antígenos de Helmintos , Genética , Alergia e Imunologia , Cromatografia em Gel , Cysticercus , Genética , Alergia e Imunologia , Metabolismo , Escherichia coli , Genética , Metabolismo , Corpos de Inclusão , Metabolismo , Renaturação Proteica , Proteínas Recombinantes , Genética , Alergia e ImunologiaRESUMO
This review focuses on the application of phage display technology in the prevention,diagnosis and treatment of parasitic diseases. It covers: ① an introduction of phage display technology,filamentous phage and the advantage of carrier. ② construction of phage antibody libraries of parasites,epitope mapping and mimotope,and their potential application in the development of novel diagnostic reagents and vaccines.