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Al-Jaberi S.A.,United Arab Emirates University | Ben-Salem S.,United Arab Emirates University | Messedi M.,Research Unit Molecular Bases of Human Diseases | Ayadi F.,Research Unit Molecular Bases of Human Diseases | And 2 more authors.
Gene | Year: 2013

Background: The chemokine receptor components play crucial roles in the immune system and some of them serve as co-receptors for the HIV virus. Several studies have documented that variants in chemokine receptors are correlated with susceptibility and resistance to infection with HIV virus. For example, mutations in the chemokine receptor 5 gene ( CCR5) resulting in loss-of-function (such as the homozygous CCR5{increment}32) confer high degree of resistance to HIV infection. Heterozygotes for these variants exhibit slow progression to AIDS. The prevalence of CCR5 polymorphisms varies among ethnic and geographical groups. For example, the CCR5{increment}32 variant is present in 10-15% of north Europeans but is rarely encountered among Africans. This study aims to identify the prevalence of some CCR5 variants in two geographically distant Arab populations (namely Emiratis and Tunisians). Methodology: The prevalence of CCR5 gene variants including CCR5{increment}32, FS299, C101X, A29S and C178R has been determined using PCR and direct DNA sequencing. A total of 403 unrelated healthy individuals (253 Emiratis and 150 Tunisians) were genotyped for the CCR5{increment}32 variant using PCR amplification and gel electrophoresis. In addition, 200 Emiratis have been screened for other SNPs using Sanger DNA sequencing. Results: Among Emiratis, the allele frequency of the CCR5{increment}32 variant has been found to be 0.002. In addition, two variants L55Q and A159 were found at a frequency of 0.002. Moreover, the prevalence of the CCR5{increment}32 variant in Tunisians was estimated to be 0.013 which is relatively higher than its frequency in Emiratis but lower than Europeans. Conclusion: We conclude that the allele frequency of the most critical CCR5 polymorphism ( {increment}32) is extremely low among Emiratis compared to other Arabs and North Europeans. In addition, very low allele frequencies of other CCR5 polymorphisms have been detected among Emiratis. •Genotyping of healthy Emiratis and Tunisians for the CCR5{increment}32 mutation•Extremely low frequency of CCR5{increment}32 variant in UAE populations•Very low frequencies for L55Q and A159 polymorphisms among Emiratis•Absence of novel CCR5 polymorphisms in 200 healthy samples from UAE. © 2013 Elsevier B.V. Source

Messedi M.,Research Unit Molecular Bases of Human Diseases | Frigui M.,Hedi Chaker Hospital | Ben Mahfoudh K.,Habib Bourguiba Hospital | Feki H.,Research Unit Molecular Bases of Human Diseases | And 4 more authors.
Archives of Medical Research | Year: 2011

Background and Aims: In this study we investigated the carotid intima-media thickness (cIMT) in Tunisian patients with Behçet's disease (BD), and we evaluated the relationship between traditional and nontraditional cardiovascular risk factors, disease manifestations, disease severity, use of immunosuppressive agents and cIMT in patients with BD. Methods: Fifty patients with BD were individually matched to 50 control subjects on the basis of age, gender and traditional cardiovascular risk factors. Subjects with diabetes mellitus, evidence of myocardial infarction or cerebrovascular disease were excluded from the study. Patients with arterial involvement were also excluded. We measured serum high-sensitivity C-reactive protein (hsCRP), fibrinogen, creatinine levels and lipid profile. We also measured serum vitamin B12, folate, total plasma homocysteine levels, and HOMA-IR values. We used B-mode ultrasonography to assess the cIMT. Results: cIMT in the BD group was significantly higher than in the control group (0.658 ± 0.112 mm vs. 0.581 ± 0.087 mm, respectively, p <10 -3). The frequency of plaques in the carotid arteries was similar between study groups. In univariate analyses, the cIMT of BD patients was correlated with age (r = 0.510, p <10 -3), male gender (p = 0.032), and creatinine clearance (r = -0.421, p = 0.003). It was inversely correlated with HOMA-IR values and serum vitamin B12 level. cIMT values were independent of disease manifestations, disease duration, or corticoid therapy. In the multivariate analysis, only male gender and creatinine clearance remained significantly associated with cIMT. Conclusions: Our data indicate morphologic evidence of subclinical atherosclerosis in patients with BD. Increased arterial wall thickness was not associated with the disease duration, clinical manifestations and immunosuppressive therapy. © 2011 IMSS. Source

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