Video Experimental Relacionado
Updated: Jul 6, 2026

10:17
An Allele-specific Gene Expression Assay to Test the Functional Basis of Genetic Associations
Published on: November 3, 2010
Transformación homeótica de la identidad de los romómeros después de la expresión localizada de Hoxb1 localizada
E Bell1, R J Wingate, A Lumsden
1Department of Developmental Neurobiology, King's College London, Guy's Hospital, London SE1 9RT, UK.
Resumen
Se cree que los genes Hox de los vertebrados identifican segmentos embrionarios. La mala expresión del gen Hoxb1 en embriones de pollo causó una transformación homeótica de segmentos del cerebro posterior, confirmando su papel en la identidad del segmento.
Área de la Ciencia:
- Biología del desarrollo Biología del desarrollo.
- Genética molecular genética molecular.
- La neurociencia es la neurociencia.
Sus antecedentes:
- La segmentación de la cabeza en los vertebrados involucra el cerebro posterior y las regiones branquiales.
- La expresión anidada de los genes Hox es crucial para este proceso de segmentación.
- Se supone que los genes Hox actúan como identificadores de segmentos.
Objetivo del estudio:
- Para probar la hipótesis de que los genes Hox funcionan como identificadores de segmentos.
- Investigar el papel de los genes Hox en la mediación del registro entre elementos embrionarios.
Principales métodos:
- Utilizó la expresión errónea retroviral y el injerto ortotópico en embriones de pollo.
- Creó un desajuste en la codificación del gen Hox entre los segmentos del cerebro posterior (rombómeros) y los arcos branquiales.
- Centrado en la expresión errónea del gen Hoxb1.
Principales resultados:
- La expresión errónea restringida por los rombomeros de Hoxb1 indujo una transformación homeótica.
- Esta transformación fue evidenciada por proyecciones alteradas del axón motor.
- Demostró un papel funcional para un solo gen Hox en la identidad del segmento.
Conclusiones:
- El estudio proporciona evidencia experimental que apoya el papel de los genes Hox como identificadores de segmentos.
- La expresión errónea de Hoxb1 altera la identidad del segmento del cerebro posterior y las conexiones neuronales asociadas.
- Confirma la función conservada de los genes Hox en el desarrollo de la cabeza de los vertebrados.
Videos de Conceptos Relacionados
Mismatch Repair
Overview
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...
Cis-regulatory Sequences
Cis-regulatory sequences are short fragments of non-coding DNA that are present on the same chromosomes as the genes that they regulate. These fragments serve as binding sites for transcriptional regulators, proteins that are responsible for controlling gene transcription and differential gene expression across cell types in eukaryotes. Cis-regulatory sequences can be close to the gene of interest or thousands of bases away in the DNA sequence; however, those sequences that are further away are...
Exon Recombination
The evolution of new genes is critical for speciation. Exon recombination, also known as exon shuffling or domain shuffling, is an important means of new gene formation. It is observed across vertebrates, invertebrates, and in some plants such as potatoes and sunflowers. During exon recombination, exons from the same or different genes recombine and produce new exon-intron combinations, which might evolve into new genes.
Exon shuffling follows “splice frame rules.” Each exon has three reading...
Exon shuffling follows “splice frame rules.” Each exon has three reading...
Mismatch Repair
Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...
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...

