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Intraspecies Gene Variation within Putative Epitopes of Immunodominant Protein P48 of Mycoplasma agalactiae | ||
| Archives of Razi Institute | ||
| مقاله 2، دوره 73، شماره 4، اسفند 2018، صفحه 265-275 اصل مقاله (973.56 K) | ||
| نوع مقاله: Original Articles | ||
| شناسه دیجیتال (DOI): 10.22092/ari.2017.115059.1143 | ||
| نویسندگان | ||
| P. Panahi1؛ S. A. Pourbakhsh* 1؛ T. Zahraei Salehi2؛ M. Esmaelizad3؛ R. Madani4، 5 | ||
| 1Mycoplasma Reference Laboratory, Razi Vaccine and Serum Research Institute, Agricultural Research, Education and Extension Organization (AREEO), Karaj, Iran | ||
| 2Department of Microbiology and Immunology, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran | ||
| 3Central Laboratory Department, Razi Vaccine and Serum Research Institute, Agricultural Research, Education and Extension Organization (AREEO), Karaj, Iran | ||
| 4Proteomics and Biochemistry Department, Razi Vaccine and Serum Research Institute, Agricultural Research, Education and Extension Organization (AREEO), Karaj, Iran. | ||
| 5Department of Microbiology, School of Specialized Veterinary Science, Science and Research Branch, Islamic Azad University, Tehran, Iran. | ||
| چکیده | ||
| P48 protein of Mycoplasma agalactiae is used to diagnose infection and was identified as potential vaccine candidate. According to the genetic nature of mycoplasma and variable sensitivity in P48-based serological diagnosis tests, intra species variation of P48 nucleotide sequence investigated in 13 field isolates of difference province of Iran along with three vaccine strains. Samples were collected from sheep and goat and were cultured in modified PPLO broth. Two pair of primer employed to confirm genus and species of isolates and a pair of primer has developed to amplify the P48 gene. The sequencing results of PCR products were aligned and analyzed besides published sequences in GenBank. T-Cell and B-Cell epitopes and antigenicity of sequence were computationally predicted. The results have shown P48 nucleotide sequences are 99.9% identical in field isolates and vaccine strain of Iran, but analysis of GenBank published sequences have shown divergence up to 5.3% at the nucleotide level and up to 4.9% divergence in protein level of P48 sequences of Iran isolates and other available sequences in GenBank. Single nucleotide polymorphism exists in 89 positions and variable amino acid was observed at 25 residues. Phylogenetic analyses have shown that Mycoplasma agalactiae isolates fall into three main groups based on P48 nucleotide sequences. Immunoinformatics analysis of all available P48 nucleotide sequences have revealed that gene variation lead to differences in immunological properties, but the gene in Iranian isolates are conservative and stable. The sequence variation in epitopes can be underlying source of antigen heterogeneity as a result, affect serological tests accuracy. Due to the high level of divergence in worldwide isolates and high degree of similarity in P48 protein of Iranian isolates, designing recombinant P48 protein based on local pattern can increase the sensitivity and consistency of serological test. | ||
| کلیدواژه‌ها | ||
| Mycoplasma؛ Contagious Agalactiae؛ P48؛ Variation؛ Antigen Heterogeneity | ||
| عنوان مقاله [English] | ||
| .. | ||
| کلیدواژه‌ها [English] | ||
| مایکوپلاسما, آگالاکسی مسری, P48, تنوع, تنوع آنتی ژنی | ||
| مراجع | ||
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