Microbiology
Shahram Jalilian; Nahid Omidi; Azarakhsh Azaran; Manoochehr Makvandi; Gholamreza Khataminia; Kambiz Ahmadi Angali
Abstract
Introduction: Epidemic Keratoconjunctivitis is an acute ocular infectious disorder often associated with Human Adenovirus Type D8 (HAdV-D8). E1A and E1B are adenoviral proteins that play a crucial role in initiating adenoviral infection and binding to cellular p53. This study aimed to analyze genomic ...
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Introduction: Epidemic Keratoconjunctivitis is an acute ocular infectious disorder often associated with Human Adenovirus Type D8 (HAdV-D8). E1A and E1B are adenoviral proteins that play a crucial role in initiating adenoviral infection and binding to cellular p53. This study aimed to analyze genomic diversity in E1A and HAdV-D8 E1B genes in patients with adenoviral Keratoconjunctivitis.Materials and Methods: Samples of 5 patients with adenoviral Keratoconjunctivitis were cultured on A549 cell line for 48 to 72 hours until the appearance of CPE. The E1 gene region was amplified by PCR and sequenced to investigate mutations.Results: The Ahvaz strain showed the highest similarity to Japanese and American HAdV-D8 and HAdV-D54 strains in E1A and E1B genes. No significant mutation was found in the E1A gene. However, in the E1B gene, an amino acid substitution of serine to phenylalanine occurred. Another mutation converting CTG to GTG in E1B 55KD was observed only in two samples. The analysis with BLOSUM62 matrix confirmed that the replacement of valine with leucine is more likely than the substitution of serine and phenylalanine, which have hydrophobic properties and higher molecular weight.Conclusion: In this study, E1A and E1B gene sequences of HAdV-D8 strain exhibited high conservation. Investigating these strains and their mutations in the human population could be valuable for determining the evolutionary capacity and pathogenicity of the virus.
Microbiology
Zohreh Ahmadiyan fard; Amin Moazami
Volume 26, Issue 6 , March and April 2020, , Pages 789-795
Abstract
Background and Objectives: Ureaplasma urealyticum and Mycoplasma genitalium are the most important opportunistic pathogens in the female reproductive system and the causative agent of the pelvic infection, non-gonococcal urethritis, abortion and infertility. The aim of this study was to frequency of ...
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Background and Objectives: Ureaplasma urealyticum and Mycoplasma genitalium are the most important opportunistic pathogens in the female reproductive system and the causative agent of the pelvic infection, non-gonococcal urethritis, abortion and infertility. The aim of this study was to frequency of Mycoplasma genitalium and Ureaplasma urealyticum among infertile women with vaginal infection by PCR in Kerman. Materials and Methods: In this cross-sectional study, the endo cervical swab sample from 60 women with vaginal infection (vaginitis and cervicitis) referred to the diagnostic laboratories of infertility treatment centers in Kerman in 2013 was prepared. The specimens were transferred to the laboratory in the transport medium and the DNA extracted from the specimens was analyzed as a template for amplification of the 16S rRNA encoding gene in the PCR reaction. Data were analyzed by SPSS V.21 software.Results: Among 60 samples, 38% (23sample) of the samples had mycoplasma contamination and Ureaplasma urealyticum and Mycoplasma genitalium bacteria were found in 13.32% (8 sample) and 11.6% (7 sample) of patients, respectively.Conclusion: Considering the potential effects of mycoplasmas on the complications of infection in maternal pregnancies and infant mortality, Therefore, the need for rapid diagnosis of this infection is felt more than ever. From the two microbial agents studied in this study, the possibility of infertility caused by infection with Ureaplasma urealyticum increased significantly, but more studies are needed
Microbiology
Mahdi Abdollahi; Fateme Tashrifi; Bagher Moradi
Volume 25, Issue 6 , November and December 2018, , Pages 781-785
Abstract
Background and purpose: Cutaneous leishmaniasis is one of important diseases that is endemic in some areas in iran. Leishmaniasis causes by leishmania parasite and can transmit by sand fly. The aim of this study was report of a cutaneous disseminated leishmaniasis case caused by corticosteroid injection ...
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Background and purpose: Cutaneous leishmaniasis is one of important diseases that is endemic in some areas in iran. Leishmaniasis causes by leishmania parasite and can transmit by sand fly. The aim of this study was report of a cutaneous disseminated leishmaniasis case caused by corticosteroid injection after incorrect microscopic diagnosis.Materials and methods: Patient was a 55 years old man who referred to the physician by a painful and wet papule on nose skin. The initial diagnosis of lupus was considered. Prednisone as a corticosteroid had been injected by physician and after a few months several painful nodular and papular lesions were appeared on patient's face, so that the simple cutaneous lishmaniasis became a Cutaneous disseminated leishmaniasis. It should be noted that the immune system of patient was normal. The patient's hom is an endemic area of the disease and the patient's wounds can be suspected of contamination with leishmaniasis. For this purpose, the patient was introduced to the laboratory and Giemsa sampling and staining were carried out.Results : After sampling and microscopic examination leishman bodies were observed in the all samples of wounds. lishmaniasis was diagnosed and then systemic treatment with glucantime was initiated immediately.Conclusion : It is proposed that in negative clinical diagnosis, the microscopic exam and high sensitive standard molecular detection tests, such as quantitative and qualitative PCR can be useful.
B BARATI; M SHIRAZI; M SAADATI; MJ SOLTANPOUR
Volume 14, Issue 2 , July and August 2007, , Pages 117-127
Abstract
Background and purpose: Staphylococcus aureus is a pathogen which can cause food poisoning, under certain conditions though growth in nutrients and producing enterotoxin. Only some strains are capable of producing enterotoxin and causing food poisoning and their presence can be detected by DNA amplification ...
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Background and purpose: Staphylococcus aureus is a pathogen which can cause food poisoning, under certain conditions though growth in nutrients and producing enterotoxin. Only some strains are capable of producing enterotoxin and causing food poisoning and their presence can be detected by DNA amplification and gene sequence specification. Therefore, this research was conducted to detect type e enterotoxin producing staphylococcus aureus.
Methods and Materials: 95 staphylococcus aureus strains were isolated from 150 nasal carriers using sterilized swabs and were confirmed by biochemical tests. Then primers were designed and the PCR was used to amplify amplify the staphylococcal enterotoxin e gene (sec) in order to detect type C enterotoxogenic strains.
Results: DNA amplification fragments of 397 bp for staphylococcal nuclease and those of 271 bp for type e gene were confirmed by enzymatic digestion. Only 9.5% of the isolated strains contained sec gene. Specificity and sensitivity were also evaluated and its sensitivity was found to be 125 cells.
Conclusion: this technique is a rapid, sensitive, specific, inexpensive and different alternative to conventional biochemical and serologic assays and it can be used to detect the agent producing type C staphylococcal enterotoxin.
SM ZARGARIAN; R GOLMOHAMMADI
Volume 14, Issue 1 , March and April 2007, , Pages 7-14
Abstract
Background and purpose: Assessment of genetic changes from a molecular viewpoint is essential for diagnosis, follow-up and treatment. For molecular procedures, DNA extraction is the first step. Therefore, applying economical and easy procedures will be helpful. Pathological specimens are normally fixed ...
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Background and purpose: Assessment of genetic changes from a molecular viewpoint is essential for diagnosis, follow-up and treatment. For molecular procedures, DNA extraction is the first step. Therefore, applying economical and easy procedures will be helpful. Pathological specimens are normally fixed in formalin and paraffin after surgery and it is important to extract quality DNA from specimens. This study is intended to compare Chelex and Phenol / Chloroform methods of DNA extraction in Paraffin-embedded Colorectal Cancer specimens and their effect on PCR-SPSS.
Methods and Materials: This descriptive-analytical study was conducted on 60 colorectal cancer specimens including 10 rectal and 50 various colon specimens. DNA extractions were done by Chelex and Phelex / Chloroform methods and their quality and quantity were measured by spectrophotometer. The P53 gene was amplified using specific primers in a PCR assay and, consequently, electrophoresis was done. The two methods were compared and analyzed by Kappa coefficient.
Results: Out of 60 subjects, 15 were female and 45 male. Their age ranged from 44 to 91 with the mean being 62 years. Quality DNA was extracted from 44 formalin-fixed specimens by Chelex method, and the PCR was positive. However, with the same sample, 32 specimens had suitable PCR assay by Phenol / Chloroform method. Therefore, a significant relationship was observed between the two methods (p