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2021, Cilt 51, Sayı 2, Sayfa(lar) 156-162
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Characterization of Phage Obtained from Methicillin -Resistant Staphylococcus aureus (MRSA)
Özlem Ulusan Bağcı, Fikret Şahin, Mehmet Kıyan
Ankara Üniversitesi Tıp Fakültesi, Tıbbi Mikrobiyoloji Anabilim Dalı, Ankara, Türkiye
Keywords: Bacteriophage, phage therapy, Staphylococcus

Objective: The emergence of Staphylococcus aureus strains resistant to all antimicrobials and failure to discover new antibiotics have led researchers to phage therapy, which lost popularity after the discovery of antibiotics. The development of recombinant technology introduced the idea of creating lysogenic recombinant phages that provide controlled bacterial death and this required small- sized phages that were easy to manipulate. Our aim is to identify small-sized lysogenic bacteriophages that can be used safely in therapy.

Method: The gene and protein map of the phage was created by analysis of sequencing after extracting a phage from the MRSA strain that is known to contain a small phage.

Results: The phage was classified in Caudovirales spp. as it contains genes encoding tail proteins, and in Podoviridae spp. due to its genomic size and arrangement.

Conclusion: To date, there are only sixteen phages from Podoviridae family uploaded on NCBI, and the phage described in this study is the seventeenth one. Only 41.4% of the ORFs (Open Reading Frames) in the genome could be matched with proteins using the NCBI BLAST. Recent studies suggest that 50-75% of bacteriophage ORFs do not correspond to any organism in GenBank. For better understanding of bacteriophages and their utilization in phage therapy, it is essential to sequence greater number of phages, and to discover their genomes and corresponding proteins. Since the genes and proteins of a lysogenic phage that can be used safely in recombinant phage therapies have been identified in our study, it will contribute to the relevant literature.


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