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Mitochondrial DNA G15927A and G15928A variations in patients with multiple sclerosis.
Multiple Sclerosis and related Disorders 2018 September 8
BACKGROUND: Modern genetics has offered a fresh perspective on the pathology of Multiple Sclerosis (MS). As mitochondrial DNA (mtDNA) variations are held to be potential contributors to the complex pathobiology of MS, the present study tests the claim that mtDNA G15927A or G15928A variations, or both, are associated with MS in an Iranian population.
MATERIALS AND METHODS: Following DNA extraction from blood samples of 100 subjects with relapsing-remitting MS, and 100 healthy unrelated control subjects, PCR-RFLP analyses was carried out by HpaII restriction enzyme reaction. Electrophoresis was then performed with 3% Agarose gel. As the restriction enzyme did not differentiate between two neighboring nucleotide positions (G15927A and G15928A), all PCR products with a variant allele were sequenced to determine the exact position of the variation.
RESULTS: The MtDNA G15927A or G15928A variations were observed in 11 of all 100 cases of MS (11%) and in 7 of 100 healthy control subjects (7%) (P = 0.3, OR = 1.6, 95% CI = 0.5-5.2). Having sequenced all the PCR products with the variant allele (11 cases and 7 controls), the mtDNA G15927A variation was found in one of the 100 cases (1%) and 3 of 100 controls (3%) (P = 0.3, OR = 0.3, 95% CI = 0.0-4.1). Therefore, the mtDNA G15928A variation was present in 10 of the 100 cases (10%) and in 4 of 100 controls (4%) (P = 0.09, OR = 2.6, 95% CI = 0.7-12.0).
CONCLUSION: Neither mtDNA variation, G15927A or G15928A, was associated with MS in the studied Iranian population. There was a non-significant association of the G15927A and the G15928A variations separately with MS.
MATERIALS AND METHODS: Following DNA extraction from blood samples of 100 subjects with relapsing-remitting MS, and 100 healthy unrelated control subjects, PCR-RFLP analyses was carried out by HpaII restriction enzyme reaction. Electrophoresis was then performed with 3% Agarose gel. As the restriction enzyme did not differentiate between two neighboring nucleotide positions (G15927A and G15928A), all PCR products with a variant allele were sequenced to determine the exact position of the variation.
RESULTS: The MtDNA G15927A or G15928A variations were observed in 11 of all 100 cases of MS (11%) and in 7 of 100 healthy control subjects (7%) (P = 0.3, OR = 1.6, 95% CI = 0.5-5.2). Having sequenced all the PCR products with the variant allele (11 cases and 7 controls), the mtDNA G15927A variation was found in one of the 100 cases (1%) and 3 of 100 controls (3%) (P = 0.3, OR = 0.3, 95% CI = 0.0-4.1). Therefore, the mtDNA G15928A variation was present in 10 of the 100 cases (10%) and in 4 of 100 controls (4%) (P = 0.09, OR = 2.6, 95% CI = 0.7-12.0).
CONCLUSION: Neither mtDNA variation, G15927A or G15928A, was associated with MS in the studied Iranian population. There was a non-significant association of the G15927A and the G15928A variations separately with MS.
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