Cytomegalovirus Seroepidemiology: a Population-based Study in Alborz Province, Iran.

Cytomegalovirus (CMV) is a type of herpes virus. This virus is one of the most common causes of congenital and prenatal infections. CMV infection in pregnant women, especially in the first trimester, may lead to congenital abnormalities in newborns. The prevalence of CMV infection in developed countries is approximately 40%, and in developing countries, this prevalence may be up to 100%. Because there is no information available related to the seroepidemiological patterns of this infection in different cities of Alborz province, Iran, this study was conducted. This seroprevalence study was based on sera collected from adults who were referred to health care providers or Medical Diagnostic Laboratory Centers (MDLS) in Alborz province, Iran, from 2011 to 2015 for different purposes. Using ELISA (IgG), a retrospective serological survey of CMV antibodies in serum samples was performed in a non-immunized community. Frozen sera from 2001 individuals who were randomly selected by a cluster sampling technique were collected from spring 2013 to winter 2015. Seroprevalence was stratified by age (>1 to <50 years). Mathematical techniques were used to determine whether there is a relationship between CMV seroprevalence and age, sex, and level of education in this community. Data were analyzed using Fisher’s exact test and the χ2 test using SPSS software version 11.5. The mean age of seropositive individuals varied between 15 and 50 years. CMV IgG was found in 1813 (91%) of 2001 individuals. In total, 188 individuals (9%) were negative for CMV IgG. There were significant relationships between seropositivity (CMV IgG) and age, sex, level of education, and level of antibody titer by sex. As in other developing countries, the prevalence of CMV infection in adults in Alborz province is high. Since CMV infection is prevalent and there are potential abnormalities associated with it, we strongly recommend the expansion of preventive measures and the establishment of programs to inform at-risk populations, especially vulnerable populations such as transplant recipients, immunocompromised patients, and school children on how to prevent this infection and its associated consequences.

Wild and attenuated vaccine RS-12 strains of mumps virus exhibit differences in amino acid sequences of their proteins.

Attenuated mumps virus (MuV) RS-12 strain-based vaccine is one of several effective vaccines available in the prevention of mumps. Since previous studies have unveiled only about one-third of the attenuated vaccine RS-12 strain genome sequence, the rest of sequence and molecular basis for attenuation remained unsolved. Therefore, in this study, the full-length genome sequences of wild and attenuated RS-12 strains were determined and compared. The comparison revealed nucleotide substitutions at 9 positions leading to amino acid substitutions at 6 positions in P, V, I, M, and L proteins, while the remaining substitutions were silent. This result indicates that the observed mutations in P, V, I, M, and L proteins of MuV might be responsible for the attenuation of the RS-12 vaccine strain.

Molecular profiling techniques and bioinformatics in cancer research.

AIMS: Our aim was to describe the commonly used molecular profiling techniques in cancer research, to examine their limitations and to discuss the challenges of bioinformatics. METHODS: A literature search was performed using the PubMed database to identify publications relevant to this review. Citations from these articles were also examined to yield further relevant publications. RESULTS: We describe the use of DNA microarrays, comparative genomic hybridisation, tissue microarrays and digital differential display. The limitations of these technologies, their contribution to cancer research and the challenges of bioinformatics are also discussed. CONCLUSIONS: Although these high throughput technologies each have their own limitations they are rapidly developing and contributing significantly to our understanding of cancer genetics. They have also led to the emergence of bioinformatics as a rapidly developing and vital field.