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Related Concept Videos

Genetic Screens02:46

Genetic Screens

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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.
Forward genetic screens
Forward or “classical” genetic screens involve creating random mutations in an organism’s DNA using radiation, mutagens, or insertion of additional bases, which...
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Genome-wide Association Studies-GWAS01:11

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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.
GWAS does not require the identification of the target gene involved in...
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Pedigree Analysis01:35

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Incomplete Dominance01:43

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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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Karyotyping01:17

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Gene Therapy00:59

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Gene therapy is a technique where a gene is inserted into a person’s cells to prevent or treat a serious disease. The added gene may be a healthy version of the gene that is mutated in the patient, or it could be a different gene that inactivates or compensates for the patient’s disease-causing gene. For example, in patients with severe combined immunodeficiency (SCID) due to a mutation in the gene for the enzyme adenosine deaminase, a functioning version of the gene can be...
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Updated: Sep 26, 2025

Determining the Likelihood of Variant Pathogenicity Using Amino Acid-level Signal-to-Noise Analysis of Genetic Variation
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Determining the Likelihood of Variant Pathogenicity Using Amino Acid-level Signal-to-Noise Analysis of Genetic Variation

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Genetic Testing for Rare Diseases.

José M Millán1,2, Gema García-García1,2

  • 1Instituto de Investigación Sanitaria La Fe, Molecular, Cellular and Genomics Biomedicine, 46026 Valencia, Spain.

Diagnostics (Basel, Switzerland)
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Summary
This summary is machine-generated.

Rare diseases affect a small percentage of the population. Understanding rare disease prevalence is crucial for diagnosis and treatment development.

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Area of Science:

  • Epidemiology
  • Genetics
  • Public Health

Background:

  • The definition of rare diseases emerged in the 1970s based on low prevalence.
  • Rare diseases collectively impact a significant portion of the population despite individual rarity.
  • Understanding the epidemiology of rare diseases is essential for resource allocation and research prioritization.

Discussion:

  • The prevalence threshold for rare diseases varies by region (e.g., <200,000 people in the US, <1 in 2,000 in the EU).
  • Genetic factors are implicated in a majority of rare diseases, highlighting the role of genomics.
  • Challenges in rare disease research include small patient populations and diagnostic delays.

Key Insights:

  • Accurate prevalence data is fundamental for rare disease classification and epidemiological studies.
  • The collective burden of rare diseases necessitates focused research and policy interventions.
  • Advancements in genomic technologies are improving the diagnosis and understanding of rare conditions.

Outlook:

  • Future research should focus on standardizing rare disease definitions and improving data collection.
  • Enhanced collaboration between researchers, clinicians, and patient advocacy groups is vital.
  • Developing targeted therapies and improving access to care remain key objectives for the rare disease community.