Video Experimental Relacionado
Updated: May 9, 2026
14:40
Expression Analysis of Mammalian Linker-histone Subtypes
Published on: March 19, 2012
Los genes alfa-globina humanos duplicados: su expresión relativa medida por análisis de ARN
Cell
|May 1, 1981
Resumen
Los investigadores identificaron distintas secuencias de ARN para los genes humanos de alfa-globina (alfa 2 y alfa 1). Esto les permitió rastrear la expresión génica durante el desarrollo y en la alfa-talasemia, revelando patrones de actividad génica.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- Genética La genética.
- Hematología Hematología.
Sus antecedentes:
- Los genes alfa-globina humanos (alfa 2 y alfa 1) codifican proteínas idénticas, pero tienen diferencias de secuencia en sus regiones 3' no traducidas.
- Estas diferencias no fueron evidentes a través del análisis estándar de ARNm y ADNc.
Objetivo del estudio:
- Desarrollar un método para distinguir y cuantificar las especies de ARNm alfa 2 y alfa 1.
- Investigar la expresión relativa de los genes alfa-globina durante el desarrollo humano.
- Para analizar la expresión génica de alfa-globina en los síndromes de alfa-talasemia.
Principales métodos:
- Utilizó el mapeo de la nucleasa S1 del ARN basado en las variaciones de secuencia de la región 3' no traducida identificadas.
- Niveles cuantificados de ARNm alfa 2 y alfa 1 en varias etapas de desarrollo y condiciones de talasemia.
Principales resultados:
- Estableció un método para detectar y cuantificar distintas especies de ARNm alfa 2 y alfa 1.
- Se observó una abundancia relativa consistente de ARN alfa 2 sobre ARN alfa 1 (60:40) en reticulocitos adultos normales y tejidos fetales.
- Se demostró que la alfa-talasemia (tipos de deleción y no deleción) involucra principalmente al ARN alfa 1, lo que permite la identificación de genes mutantes.
Conclusiones:
- El ensayo de mapeo de la nucleasa S1 diferencia y cuantifica efectivamente el ARNm alfa 2 y alfa 1.
- El patrón de expresión relativa de los genes alfa-globina se establece temprano en el desarrollo y se mantiene.
- Este método permite la identificación de defectos genéticos específicos en la alfa-talasemia, en particular las formas de no eliminación.
Videos de Conceptos Relacionados
01:57Gene Families
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...
01:58Cell Specific Gene Expression
Multicellular organisms contain a variety of structurally and functionally distinct cell types, but the DNA in all the cells originated from the same parent cells. The differences in the cells can be attributed to the differential gene expression. Liver cells, whose functions include detoxification of blood, production of bile to metabolize fats, and synthesis of proteins essential for metabolism, must express a specific set of genes to perform their functions. Gene expression also varies with...
02:37Gene Duplication and Divergence
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 characterized.
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 characterized.
02:34DNA Microarrays
Microarrays are high-throughput and relatively inexpensive assays that can be automated to analyze large quantities of data at a time. They are used in genome-wide studies to compare gene or protein expression under two varied conditions, such as healthy and diseased states. Microarrays consist of glass or silica slides on which probe molecules are covalently attached through surface functionalization. Most commonly, the slides are prepared through the chemisorption of silanes to silica...
02:24Ribosome Profiling
Ribosome profiling or ribo-sequencing is a deep sequencing technique that produces a snapshot of active translation in a cell. It selectively sequences the mRNAs protected by ribosomes to get an insight into a cell’s translation landscape at any given point in time.
Applications of ribosome profiling
Ribosome profiling has many applications, including in vivo monitoring of translation inside a particular organ or tissue type and quantifying new protein synthesis levels.
The technique helps...
Applications of ribosome profiling
Ribosome profiling has many applications, including in vivo monitoring of translation inside a particular organ or tissue type and quantifying new protein synthesis levels.
The technique helps...
01:30General Transcription Factors
Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...