ABSTRACT. A method for identifying single nucleotide polymorphisms of the PfMDR1 gene (A958146T, A961013G, G961625T) based on the analysis of the lengths of restriction fragments using polymerase chain reaction technology with specific primers is presented. To identify the polymorphism A958146T (amino acid substitution N86Y), it was proposed to amplify a fragment of parasitic deoxyribonucleic acid with a length of 417 bp, including the 86th codon of the PfMDR1 gene, followed by treatment of the amplicon with ApoI endonuclease, the restriction site of which includes the sequence of the analyzed mutation. With the Plasmodium falciparum genotype unchanged, the isolated deoxyribonucleic acid site is divided into two fragments of size 239 and 179 bp. In the case of an altered genotype containing a single nucleotide missense mutation A T, the original fragment 417 bp will be preserved. When designing the system to detect the amino acid substitution N1042D caused by the A961013G mutation, a pair of specific primers were selected that limit the 404 bp-long section of parasitic deoxyribonucleic acid. For restriction analysis, the most optimal was the use of AseI endonuclease, which in the case of an unchanged Plasmodium falciparum genotype divides the initial amplicon into 4 fragments (132, 116, 99 and 25 bp), and in the presence of A G mutation into 3 (248, 99, 25 bp). It was found that a fragment of the PfMDR1 gene, including the G961625T mutation leading to the amino acid substitution D1246Y, contains 1 site corresponding to the restriction site of endonuclease BglII. Therefore, in the case of the wild genotype of Plasmodium falciparum, the initial fragment of deoxyribonucleic acid is cut into 2 short sections (300 and 269 bp). With the D1246 mutation, the replacement of the nucleotide G T leads to the disappearance of the restriction site, so only one source fragment (509 bp) will be recorded on the electrophoregram. Based on the analysis of the data obtained, criteria for evaluating the drug resistance of Plasmodium falciparum have been developed. The decrease in sensitivity to mefloquine and its derivatives of pathogens of tropical malaria can be evidenced by positive results obtained using the developed methods for detecting haplotypes A T (N86Y (band 417 bp)), A G (N1042D (bands 248, 99 and 25 bp)), G T (D1246Y (509 bp)). The developed methods can be used to analyze the spread of drug-resistant tropical malaria.
A pilot study of the association of single nucleotide polymorphisms in catalase (rs7943316), glutathione peroxidase-1 (rs1050450), and transferrin (rs8177178) genes with the risk of keratoconus development was conducted in a sample of Russian patients. Genotyping was performed by analyzing the polymorphism of the lengths of restriction fragments using a polymerase chain reaction. Venous blood samples from 25 patients with keratoconus treated at the Ophthalmology Clinic of the Kirov Military medical Academy in 2019 and 2020 were examined. The control group included 20 patients who had no clinical signs of keratoconus. The effect of the single nucleotide polymorphism rs7943316 of the catalase gene on the risk of keratoconus development has not been established. The T allele of the glutathione peroxidase-1 gene containing the rs1050450 polymorphism slightly increases the risk of keratoconus compared with the C allele (odds ratio = 1.91; 95% confidence interval = 0.754.85; p = 0.17). A moderate association of the A allele of the transferrin gene containing rs8177178 polymorphism with the occurrence of keratoconus and an increase in the incidence of the disease associated with the AG genotype was revealed (odds ratio = 5.67; 95% confidence interval = 1.0730; p = 0.12). Thus, when examining a limited sample of Russian patients with keratoconus, it was not possible to identify a link between the disease and single nucleotide polymorphisms of catalase rs7943316 and glutathione peroxidase-1 rs1050450. The relationship between the polymorphism of the transferrin rs8177178 gene (allele A and genotype AG) and the risk of keratoconus development was weak and not significant. Thus, expanding the study sample and further studying the polymorphisms of the transferrin gene that affect the structure of the enzyme and reduce the effectiveness of antioxidant protection of the cornea were recommended.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
customersupport@researchsolutions.com
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.