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Gholamhosseini-Moghaddam T, Rad M, Mousavi SF, et al. Detection of lytA, pspC, and rrgA genes in Streptococcus pneumoniae isolated from healthy children. Iran J Microbiol. 2015;7(3):156-60
Gholamhosseini-Moghaddam, T., Rad, M., Mousavi, S. F., & Ghazvini, K. (2015). Detection of lytA, pspC, and rrgA genes in Streptococcus pneumoniae isolated from healthy children. Iranian journal of microbiology, 7(3), 156-60.
Gholamhosseini-Moghaddam, Tahereh, et al. "Detection of lytA, pspC, and rrgA genes in Streptococcus pneumoniae isolated from healthy children." Iranian journal of microbiology vol. 7,3 (2015): 156-60.
Gholamhosseini-Moghaddam T, Rad M, Mousavi SF, Ghazvini K. Detection of lytA, pspC, and rrgA genes in Streptococcus pneumoniae isolated from healthy children. Iran J Microbiol. 2015 Jun;7(3):156-60. PMID: 26668703; PMCID: PMC4676985.
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Iran J Microbiol. 2015 Jun;7(3):156-60.

Detection of lytA, pspC, and rrgA genes in Streptococcus pneumoniae isolated from healthy children.

Iranian journal of microbiology

Tahereh Gholamhosseini-Moghaddam, Mehrnaz Rad, Seyed Fazlollah Mousavi, Kiarash Ghazvini

Affiliations

  1. Department of Pathobiology, School of Veterinary Medicine, Ferdowsi University of Mashhad, Mashhad, Iran.
  2. Department of Bacteriology and Microbiology Research Center, Pasteur Institute of Iran, Tehran, Iran.
  3. Antimicrobial Resistance Research Center, Faculty of Madicine, Mashhad University of Medical Sciences, Mashhad, Iran.

PMID: 26668703 PMCID: PMC4676985

Abstract

BACKGROUND AND OBJECTIVES: Many surface proteins are implicated in nasopharyngeal colonization and pathogenesis of Streptococcus pneumoniae. Some of these factors are candidate antigens for protein based vaccines. New vaccine designs focus on the surface proteins (e. g., pspA and pspC) and also cytolysin, and pneumolysin. In this study, 3 key virulence genes, lytA, pspC, and rrgA, which encoded surface proteins, were detected among S. pneumoniae isolates.

MATERIALS AND METHODS: A total of 260 nasopharyngeal swabs were collected from healthy children under 6 years old attending day care centers in Mashhad, Iran. Isolates of S. pneumoniae were confirmed by optochin susceptibility and colony appearance and also by PCR for cpsA gene. The presence of lytA, pspC, and rrgA genes were also detected by PCR.

RESULTS: A total of 59 isolates were confirmed as S. pneumoniae. Among these isolates, 50 (84.74%), 19 (32.20%), and 2 (3.38%) were positive for lytA, rrgA, and pspC genes respectively. The presence of these genes among S.pneumoniae isolates were as follows: 1) rrgA, lytA, pspC (1 isolate), 2) rrgA, lytA(17isolates), 3) pspC (2 isolate), 4) lytA (50 isolates).

CONCLUSION: cpsA gene was specific for detection of S. pneumoniae isolates which were colonized in nasopharynx. The lytA gene was the most frequent gene among the S. pneumoniae isolates, and combination of rrgA, lytA was the most observed pattern. Thus, it is important for future monitoring of vaccine formulation in our country.

Keywords: Streptococcus pneumoniae; children; lytA; pspC; rrgA

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