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Comparing Copy Number Variations and SNPs02:26

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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.
Copy number variations or CNVs are the structural variations that cover more than 1kb of DNA sequence. The single nucleotide polymorphism (SNP), on the other hand, is a single nucleotide change or a point mutation that is found in more than 1%...
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Incomplete Dominance01:43

Incomplete Dominance

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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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Genetic Variation01:25

Genetic Variation

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Genetic variation is the diversity in DNA sequences found among individuals of the same species. This diversity is crucial for a species' survival because it helps organisms adapt to environmental changes. Genetic variation begins with fertilization, where an egg and sperm cell merge. Each of these cells carries 23 chromosomes, up to 46 in the fertilized egg. Chromosomes are long DNA strands that contain genes, the basic units of heredity.
Genes exist in different versions called alleles,...
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Epistasis Analysis01:09

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Although Mendel chose seven unrelated traits in peas to study gene segregation, most traits involve multiple gene interactions that create a spectrum of phenotypes. When the interaction of various genes or alleles at different locations influences a phenotype, this is called epistasis. Epistasis often involves one gene masking or interfering with the expression of another (antagonistic epistasis). Epistasis often occurs when different genes are part of the same biochemical pathway. The...
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Single Nucleotide Polymorphisms-SNPs01:05

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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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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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Updated: Sep 10, 2025

Screening for Functional Non-coding Genetic Variants Using Electrophoretic Mobility Shift Assay EMSA and DNA-affinity Precipitation Assay DAPA
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Variantes estructurales: Mecanismos, mapeo e interpretación en la genética humana

Shruti Pande1, Moez Dawood1,2,3, Christopher M Grochowski1,2

  • 1Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX 77030, USA.

Genes
|August 28, 2025
PubMed
Resumen

Las variaciones estructurales (SV) son cambios genómicos que afectan a los rasgos y enfermedades. Los avances en la secuenciación mejoran la detección de SV, pero comprender su impacto funcional y sus mecanismos sigue siendo crucial para la investigación genómica.

Palabras clave:
Las llamadas SVMecanismos de mutagénesis de la SVmultiómicasecuenciación de próxima generaciónVariaciones estructurales (SV)

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Mapping Alzheimer's Disease Variants to Their Target Genes Using Computational Analysis of Chromatin Configuration
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Área de la Ciencia:

  • La genómica
  • Biología molecular
  • La bioinformática

Sus antecedentes:

  • Las variaciones estructurales (SV) implican la ruptura y la reunificación del ADN, que afectan la dosificación y los reordenamientos de los genes.
  • Los SV están implicados en rasgos físicos, trastornos genómicos y rasgos complejos.

Objetivo del estudio:

  • Proporcionar una visión general de las variaciones estructurales.
  • Para discutir sus mecanismos de mutagénesis y detección en la era de la genómica.

Principales métodos:

  • Revisión de los avances recientes en las tecnologías de secuenciación.
  • Análisis de las herramientas bioinformáticas para la detección e interpretación de SV.

Principales resultados:

  • La secuenciación y la bioinformática han mejorado significativamente la resolución y la escala de detección de SV.
  • El impacto funcional y los mecanismos de los SV en rasgos complejos son áreas de investigación activas.

Conclusiones:

  • A pesar de los avances tecnológicos, persisten los desafíos en la detección de SV, la anotación y la interpretación funcional.
  • Las futuras direcciones de investigación se centran en la comprensión de los mecanismos de SV y su importancia biológica.