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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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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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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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Mice have long served as models for studying human biology and pathology because of their phylogenetic and physiological similarity with humans. They are also easy to maintain and breed in the laboratory, and hence, many inbred strains are now available for research. Studies on mice have contributed immeasurably to our understanding of cancer biology.
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Although the genetic makeup of an organism plays a major role in determining the phenotype, there are also several environmental factors, such as temperature, oxygen availability, presence of mutagens, that can alter an organism’s phenotype.
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Diploid organisms inherit genetic material through chromosomes from both parents. Copies of the same gene are known as alleles. In most cases, both alleles are simultaneously expressed and allow various cellular processes to function optimally. If one of the alleles is missing or mutated, the expression of the other allele can compensate; however, this is not true for all genes.
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Video Experimental Relacionado

Updated: Feb 26, 2026

Microinjection of Medaka Embryos for use as a Model Genetic Organism
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Medaka: un nuevo modelo para analizar las interacciones genoma-ambiente

Kiyoshi Naruse1, Felix Loosli2, Satoshi Ansai3

  • 1Laboratory of Bioresources, National Institute for Basic Biology, Okazaki 444-8585, Japan.

Trends in genetics : TIG
|February 24, 2026
PubMed
Resumen

Los peces medaka son un modelo versátil de vertebrado para la investigación, ideal para estudiar cómo interactúan los genes y el medio ambiente. Su adaptabilidad y recursos genéticos respaldan estudios avanzados en evolución y biomedicina.

Palabras clave:
Estudios de asociación genómica completa (GWAS)mapeo de QTLinteracciones genoma-ambientemedakarecurso de genética de poblacionescepas derivadas de poblaciones silvestres

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Área de la Ciencia:

  • Sistemas modelo de vertebrados
  • Genómica y epigenética
  • Biología evolutiva

Sus antecedentes:

  • Medaka (pez) es un modelo bien establecido para la investigación biológica y biomédica.
  • Posee una adaptabilidad ecológica única (4-40 °C, salinidades variables) y es experimentalmente manejable.
  • Alta tolerancia a la endogamia permite la creación de paneles de investigación genéticamente uniformes.

Objetivo del estudio:

  • Destacar la idoneidad de medaka para estudiar las interacciones genoma-ambiente.
  • Mostrar la utilidad de diversas cepas de medaka y herramientas genéticas avanzadas.
  • Posicionar medaka como un marco para integrar la investigación genética, ambiental y epigenética.

Principales métodos:

  • Utilización del panel Medaka Inbred Kiyosu-Karlsruhe (80 líneas casi isogénicas).
  • Análisis de más de 100 cepas de medaka derivadas de poblaciones silvestres y completamente secuenciadas.
  • Aplicación de métodos de cuantificación avanzados para estudios de asociación genómica completa (GWAS) y mapeo de locus de rasgos cuantitativos (QTL).
  • Empleo de la edición génica CRISPR/Cas9 (Clustered Regularly Interspaced Short Palindromic Repeats) y perfilado epigenómico.

Principales resultados:

  • Medaka exhibe baja variación intra-cepa pero alta variabilidad inter-cepa (tasas de SNP >4%).
  • El sistema admite análisis genéticos avanzados como GWAS y mapeo de QTL.
  • La edición CRISPR/Cas9 y el perfilado epigenómico facilitan la validación causal y el descubrimiento de mecanismos reguladores.

Conclusiones:

  • Medaka proporciona un marco de vertebrado sin igual para integrar genética, ambiente y epigenética.
  • Este sistema modelo une perspectivas de investigación evolutiva, biomédica y a nivel de población.
  • Sus características únicas permiten estudios exhaustivos de interacciones biológicas complejas.