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Single Nucleotide Polymorphisms-SNPs01:05

Single Nucleotide Polymorphisms-SNPs

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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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Human Genetics01:28

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Human genetics provides a profound framework for understanding the interplay between genetic predispositions and human psychology. At the heart of this discipline lies the study of how genes influence physical traits, behaviors, and susceptibility to diseases. Each person carries a unique genetic code that subtly or significantly shapes their psychological and behavioral landscape.
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Pleiotropy01:33

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Pleiotropy is the phenomenon in which a single gene impacts multiple, seemingly unrelated phenotypic traits. For example, defects in the SOX10 gene cause Waardenburg Syndrome Type 4, or WS4, which can cause defects in pigmentation, hearing impairments, and an absence of intestinal contractions necessary for elimination. This diversity of phenotypes results from the expression pattern of SOX10 in early embryonic and fetal development. SOX10 is found in neural crest cells that form melanocytes,...
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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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Gene expression is a dynamic process that is significantly influenced by environmental factors. This interaction underlies the complex nature of biological development and the phenotypic differences observed among individuals, even among those with identical genetic makeups. Factors such as radiation, temperature, behavior, nutrition, and stress play pivotal roles in determining how genes are expressed. The concept of the reaction range is central to understanding this interaction. It posits...
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Gregor Mendel's work (1822 - 1884) was primarily focused on pea plants. Through his initial experiments, he determined that every gene in a diploid cell has two variants called alleles inherited from each parent. He suggested that amongst these two alleles, one allele is dominant in character and the other recessive. The combination of alleles determines the phenotype of a gene in an organism.
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Sex-Specific Association Between XPC rs2228001 Polymorphism and Parkinson's Disease Risk in a Mexican Population: A

Karla Mariana Alvarado-Retana1, Daniel Francisco Ramos-Rosales1, Elizabeth Irasema Antuna-Salcido1

  • 1Instituto de Investigación Científica, Universidad Juárez del Estado de Durango, Durango 34000, Mexico.

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|September 27, 2025
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Summary

Parkinson's disease (PD) risk may be linked to specific DNA repair gene variants, especially in males exposed to pesticides. The XPC rs2228001 variant showed a sex-specific association with PD susceptibility.

Keywords:
Parkinson’s diseaseXPCnucleotide excision repairrs2228001

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Area of Science:

  • Neuroscience
  • Genetics
  • Environmental Health

Background:

  • Parkinson's disease (PD) pathogenesis is increasingly linked to impaired DNA repair mechanisms.
  • Oxidative stress and environmental factors are implicated in PD development.
  • Nucleotide excision repair (NER) pathways play a crucial role in maintaining genomic stability.

Purpose of the Study:

  • To investigate the association between polymorphisms in five NER pathway genes and PD susceptibility.
  • To examine potential sex-specific genetic contributions to PD risk.
  • To explore the role of environmental factors like pesticide exposure in PD.

Main Methods:

  • A case-control study involving 137 PD patients and 137 controls from northern Mexico.
  • Genotyping of five NER gene polymorphisms (ERCC1, ERCC2, XPA, XPC, XPF) using TaqMan real-time PCR.
  • Logistic regression analysis adjusted for age, sex, and pesticide exposure.

Main Results:

  • Pesticide exposure was significantly higher in PD patients (OR 2.08).
  • The XPC rs2228001 C/C genotype was associated with increased PD risk in males (OR 3.25), independent of other factors.
  • Male PD patients had lower serum uric acid levels, suggesting increased oxidative stress.

Conclusions:

  • The XPC rs2228001 variant may confer a sex-specific genetic risk for PD, particularly with pesticide exposure.
  • DNA repair pathways are relevant to PD pathogenesis.
  • Integrated models considering genetic and environmental factors are crucial for understanding PD.