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A single nucleotide polymorphism or SNP is a single nucleotide variation at a specific genomic position in a large population. It is the most prevalent type of sequence variation found in the human genome. Point mutations that occur in more than 1% of the population qualify as SNPs. These are present once every 1000 nucleotides on an average in the human genome. Replacement of a purine with another purine (A/G) or a pyrimidine with another pyrimidine (C/T) is known as a transition. In contrast,...
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Sequencing of the human genome has opened up several best-kept secrets of the genome. Scientists have identified thousands of genome variations that exist within a population. These variations can be a single nucleotide or a larger chromosomal variation.
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Genome-wide association studies or GWAS are used to identify whether common SNPs are associated with certain diseases. Suppose specific SNPs are more frequently observed in individuals with a particular disease than those without the disease. In that case, those SNPs are said to be associated with the disease. Chi-square analysis is performed to check the probability of the allele likely to be associated with the disease.
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Polymorphisms CYP2R1 rs10766197 and CYP27B1 rs10877012 in Multiple Sclerosis: A Case-Control Study.

A Martinez-Hernandez1, E E Perez-Guerrero2, M A Macias-Islas3

  • 1Programa de Doctorado en Farmacología, Departamento de Fisiología, Centro Universitario de Ciencias de la Salud, Universidad de Guadalajara, Guadalajara, Mexico.

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|January 3, 2022
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Summary
This summary is machine-generated.

Low vitamin D levels are linked to multiple sclerosis (MS) risk. The CYP2R1 gene rs10766197 polymorphism, specifically GA/AA genotypes, increases MS risk in Mexican Mestizo individuals. Vitamin D levels and these gene variants do not predict MS severity.

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Area of Science:

  • Neuroimmunology
  • Genetics
  • Endocrinology

Background:

  • Multiple sclerosis (MS) is a chronic autoimmune disease where low vitamin D levels are a potential risk factor.
  • Genetic variations may also play a role in MS susceptibility and progression.
  • This study investigates the association between specific gene polymorphisms and MS in a Mexican Mestizo population.

Purpose of the Study:

  • To evaluate the association of MS with rs10766197 polymorphism in the CYP2R1 gene and rs10877012 polymorphism in the CYP27B1 gene.
  • To determine if these polymorphisms correlate with the severity of MS progression.
  • To compare serum 25-hydroxyvitamin D levels between MS patients and healthy controls.

Main Methods:

  • A case-control study involving 116 MS patients and 226 controls of Mexican Mestizo ethnicity.
  • MS diagnosis confirmed using McDonald criteria (2017).
  • Genotyping of CYP2R1 rs10766197 and CYP27B1 rs10877012 polymorphisms via real-time PCR; serum 25(OH) vitamin D levels measured by ELISA.

Main Results:

  • MS patients exhibited lower serum 25(OH) vitamin D levels compared to controls (p=0.009).
  • The A allele frequency of CYP2R1 rs10766197 was higher in MS patients (p=0.05).
  • Carriers of GA + AA genotypes of CYP2R1 rs10766197 showed an increased risk of MS (p=0.03).
  • No significant differences in vitamin D levels or allele/genotype frequencies were found concerning MS progression severity.
  • CYP27B1 rs10877012 polymorphism showed no association with MS risk or severity.

Conclusions:

  • Lower serum 25(OH) vitamin D levels are associated with MS, but not disease severity.
  • The CYP2R1 rs10766197 polymorphism (GA/AA genotypes) is linked to an increased risk of developing MS.
  • Neither CYP2R1 rs10766197 nor CYP27B1 rs10877012 polymorphisms are associated with severe MS progression.