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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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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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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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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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Genetic screens are tools used to identify genes and mutations responsible for phenotypes of interest. Genetic screens help identify individuals or a group of people at risk of developing  genetic diseases and help them with early intervention, targeted therapy, and reproductive options.
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Polygenic Risk Scores and Genetically Complex Eye Disease.

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Polygenic risk scores (PRSs) show promise for predicting complex eye diseases using genome-wide association study data. However, challenges remain in their clinical implementation and equitable application across diverse populations.

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Area of Science:

  • Ophthalmology
  • Genetics
  • Bioinformatics

Background:

  • Genome-wide association studies (GWASs) have identified genetic variants linked to complex eye diseases.
  • Polygenic risk scores (PRSs) are emerging tools to assess genetic predisposition to disease.
  • PRSs leverage GWAS data to quantify an individual's genetic liability.

Purpose of the Study:

  • To review the development and application of PRSs for common eye diseases.
  • To evaluate the predictive accuracy and clinical utility of PRSs.
  • To discuss challenges and future directions for PRS implementation in ophthalmology.

Main Methods:

  • Literature review of studies on PRSs in eye diseases.
  • Analysis of PRS prediction accuracy and risk stratification capabilities.
  • Examination of barriers to clinical translation and future research needs.

Main Results:

  • PRSs demonstrate potential in predicting risk and stratifying patients for certain eye conditions.
  • Current clinical implementation of PRSs is uncertain, especially where treatment options are limited.
  • Significant challenges exist in translating PRSs into practice, including issues with diverse ancestry groups and risk communication.

Conclusions:

  • PRSs are a valuable tool for understanding genetic risk in eye diseases.
  • Further research is needed to overcome implementation barriers and ensure equitable use of PRSs.
  • Future advancements may enhance the clinical utility of PRSs in ophthalmology.