Video Experimental Relacionado
Updated: Sep 8, 2025

10:17
An Allele-specific Gene Expression Assay to Test the Functional Basis of Genetic Associations
Published on: November 3, 2010
23.0K
Epistasis fantasma a través de la lente de las genealogías
Anastasia Ignatieva1, Lino A F Ferreira1
1Department of Statistics, University of Oxford, Oxford OX1 3LB, UK.
Genetics
|September 5, 2025
Resumen
La epistasis fantasma, una falsa señal de interacción entre genes, se puede detectar utilizando datos genealógicos. Nuestro nuevo método distingue verdaderos efectos biológicos de señales espurias, incluso para variantes genéticas cercanas.
Área de la Ciencia:
- La genética
- La bioinformática
- Estadística genómica
Sus antecedentes:
- La epistasis fantasma puede conducir a una interpretación errónea de las interacciones entre genes.
- Distinguir la epistasis verdadera de la epistasis fantasma es un desafío, especialmente para los polimorfismos de nucleótido único (SNP) vinculados.
Objetivo del estudio:
- Desarrollar un nuevo método para detectar la epistasis fantasma utilizando información genealógica.
- Para diferenciar las señales espurias de interacción gen-gen de los efectos biológicos genuinos.
Principales métodos:
- Utilizando gráficos de recombinación ancestral para analizar la evidencia genealógica de la epistasis fantasma.
- Desarrollo de un método para cuantificar la evidencia genealógica de la epistasis fantasma, aplicable a diferentes distancias genéticas.
- El uso de simulaciones y análisis de datos reales para validar el rendimiento del método.
Principales resultados:
- El método propuesto identifica eficazmente la epistasis fantasma.
- Se observó un alto rendimiento incluso a distancias genéticas bajas (aprox. 0, 5 cm) en el mismo lugar.
- Demostró la utilidad del método en datos genéticos del mundo real.
Conclusiones:
- Los datos genealógicos proporcionan una herramienta poderosa para detectar la epistasis fantasma.
- Este método permite una distinción precisa entre las interacciones genéticas verdaderas y espurias.
- Abre posibilidades para un análisis fiable de la interacción cis en estudios genéticos.
Videos de Conceptos Relacionados
Epistasis Analysis
5.2K
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...
5.2K
Epistasis
47.6K
In addition to multiple alleles at the same locus influencing traits, numerous genes or alleles at different locations may interact and influence phenotypes in a phenomenon called epistasis. For example, rabbit fur can be black or brown depending on whether the animal is homozygous dominant or heterozygous at a TYRP1 locus. However, if the rabbit is also homozygous recessive at a locus on the tyrosinase gene (TYR), it will have an unshaded coat that appears white, regardless of its TYRP1...
47.6K
Gene Families
9.1K
Gene families consist of groups of genes proposed to have originated from a common ancestor. Typically these arise through events in which a gene or genes are mistakenly duplicated during cell division. Unlike their parent genes (which are subject to selection pressure to maintain function), these gene copies do not need to preserve their sequences and may evolve at a relatively faster rate.
Occasionally these regions can be adapted to take on new roles within the organism, becoming novel genes...
Occasionally these regions can be adapted to take on new roles within the organism, becoming novel genes...
9.1K
Gene Duplication and Divergence
6.3K
The seminal work of Ohno in 1970 popularized the idea of gene duplication and divergence. DNA sequence comparison studies reveal that a large portion of the genes in bacteria, archaebacteria, and eukaryotes was generated by gene duplication and divergence, indicating its critical role in evolution.
The duplicated copies of the gene are called Paralogs. Paralogs with similar sequences and functions form a gene family. Across several species, a large number of gene families are...
The duplicated copies of the gene are called Paralogs. Paralogs with similar sequences and functions form a gene family. Across several species, a large number of gene families are...
6.3K
Pedigree Analysis
85.1K
Overview
85.1K
Trihybrid Crosses
23.7K
Trihybrid Crosses
Some of Mendel’s crosses examined three pairs of contrasting characteristics. Such a cross is called a trihybrid cross. A trihybrid cross is a combination of three individual monohybrid crosses. For example, plant height (tall vs. short), seed shape (round vs. wrinkled), and seed color (yellow vs. green).
The F1 generation plants of a trihybrid cross are heterozygous for all three traits and produce eight gametes. Upon self-fertilization, these gametes have an equal...
Some of Mendel’s crosses examined three pairs of contrasting characteristics. Such a cross is called a trihybrid cross. A trihybrid cross is a combination of three individual monohybrid crosses. For example, plant height (tall vs. short), seed shape (round vs. wrinkled), and seed color (yellow vs. green).
The F1 generation plants of a trihybrid cross are heterozygous for all three traits and produce eight gametes. Upon self-fertilization, these gametes have an equal...
23.7K

