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CTLA-4 gene polymorphisms (-318C/T, +49A/G, +6230A/G) in Iranian patients with multiple sclerosis
Abolfazl Heidari1, Mohammad Reza Noori Daloii, Mohammad Keramatipour
1Department of Medical Genetics, Faculty of Medicine, Tehran University of Medical Sciences and Health Services, Tehran, Iran.
Abstract:
Multiple sclerosis (MS) is a disease of the central nervous system (CNS) characterized by multiple regions of demyelination and inflammation along axons with a T cell-mediated autoimmune etiology. While the cytotoxic T lymphocyte antigen 4 (CTLA-4) gene seems to be a strong candidate gene in autoimmune diseases, we investigated its association with a group of patients with MS. One hundred and thirty five patients with relapsing-remitting form of MS and 135 healthy subjects were enrolled in this study. Three single nucleotide polymorphisms (SNPs) (-318C/T, +49A/G, +6230A/G) of the CTLA-4 gene were assessed using PCR-RFLP method. The genotypes -318 CC (82.9% in patients vs. 76.2% in controls) and +49 AA (31.1% in patients vs. 28.1% in controls) were overrepresented in the patient group; however, these differences were not statistically significant. In spite of some previous reports, this study did not confirm any significant association with alleles and genotypes of SNPs of the CTLA4 in Iranian MS patients. Such disparity could be due to genetic background, ethnicity and different forms of the disease.
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Translation
Translation is the process of synthesizing proteins from the genetic information carried by messenger RNA (mRNA). Following transcription, it constitutes the final step in the expression of genes. This process is carried out by ribosomes, complexes of protein and specialized RNA molecules. Ribosomes, transfer RNA (tRNA), and other proteins produce a chain of amino acids—the polypeptide—as the end product of translation.
Translation Produces the Building Blocks of Life

