Video Experimental Relacionado
Updated: Aug 2, 2026

06:45
Transmembrane Domain Oligomerization Propensity determined by ToxR Assay
Published on: May 26, 2011
Mutantes constitutivos en la respuesta feromónica de la levadura: función ordenada de los productos génicos
D Blinder1, S Bouvier, D D Jenness
1Department of Molecular Genetics and Microbiology, University of Massachusetts Medical School, Worcester 01655.
Cell
|February 10, 1989
Resumen
Los investigadores identificaron mutantes de levadura con una vía de respuesta de feromonas constantemente activa. Este estudio revela nuevos conocimientos sobre los roles de los genes SCG1 y STE4 en la división y señalización de las células de levadura.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- Biología celular Biología celular.
- Genética de la levadura Genética de la levadura
Sus antecedentes:
- La feromona del factor alfa es crucial para la regulación de la división celular de la levadura.
- Comprender la vía de respuesta de las feromonas es clave para el control del ciclo celular de la levadura.
Objetivo del estudio:
- Desarrollar un método para aislar mutantes de levadura con respuesta feromónica constitutiva.
- Para identificar genes involucrados en la vía de señalización de feromonas de levadura.
Principales métodos:
- Aislamiento de mutantes de levadura utilizando un método de cribado general.
- Análisis genético de mutantes dobles que involucran a STE4 y SCG1.1.
Principales resultados:
- Se identificaron un alelo STE4 dominante y mutaciones recesivas de SCG1.
- SCG1 y STE4 codifican los homólogos G alfa y G beta, respectivamente.
- STE4 funciona aguas abajo de SCG1 pero aguas arriba de STE5 en la vía.
Conclusiones:
- El estudio proporciona un método para sondear la respuesta de las feromonas de la levadura.
- Elucida la función secuencial de SCG1 y STE4 en la señalización de la levadura.
Videos de Conceptos Relacionados
Mutations
Overview
Law of Segregation
When crossing pea plants, Mendel noticed that one of the parental traits would sometimes disappear in the first generation of offspring, called the F1 generation, and could reappear in the next generation (F2). He concluded that one of the traits must be dominant over the other, thereby causing masking of one trait in the F1 generation. When he crossed the F1 plants, he found that 75% of the offspring in the F2 generation had the dominant phenotype, while 25% had the recessive phenotype.
Position-effect Variegation
In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
Gene Conversion
Other than maintaining genome stability via DNA repair, homologous recombination plays an important role in diversifying the genome. In fact, the recombination of sequences forms the molecular basis of genomic evolution. Random and non-random permutations of genomic sequences create a library of new amalgamated sequences. These newly formed genomes can determine the fitness and survival of cells. In bacteria, homologous and non-homologous types of recombination lead to the evolution of new...
Trihybrid Crosses
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 chance to...
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 chance to...
Genetic Variation
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, which...
Genes exist in different versions called alleles, which...

