Video Experimental Relacionado
Updated: Jul 8, 2026

08:12
Assessing Somatic Hypermutation in Ramos B Cells after Overexpression or Knockdown of Specific Genes
Published on: November 1, 2011
Las proteínas E2A son necesarias para el desarrollo adecuado de las células B y el inicio de los reordenamientos de
G Bain1, E C Maandag, D J Izon
1Department of Biology, University of California, San Diego, La Jolla 92130.
Cell
|December 2, 1994
Resumen
Los factores de transcripción E2A son cruciales para el desarrollo de las células B. Los ratones sin E2A carecen de células B maduras, lo que indica E2A.
Área de la Ciencia:
- Inmunología Inmunología.
- Biología Molecular Biología Molecular
- Genética La genética.
Sus antecedentes:
- E12 y E47 son factores de transcripción helix-loop-helix derivados del gen E2A.
- Se sabe que estos factores regulan la expresión génica de las inmunoglobulinas.
- El papel preciso de E2A en la diferenciación temprana de las células B sigue sin estar claro.
Objetivo del estudio:
- Investigar la función de los factores de transcripción E2A en el desarrollo de las células B.
- Para determinar el impacto de la deficiencia de E2A en la maduración de las células B y la expresión génica de las inmunoglobulinas.
Principales métodos:
- Generación de ratones mutantes E2A-nulo utilizando la orientación genética.
- Análisis de las etapas de desarrollo de las células B en ratones mutantes homocigotos.
- Evaluación cuantitativa de la inmunoglobulina y las transcripciones genéticas relacionadas (RAG-1, mb-1, CD19, lambda 5, B29, mu grados, Pax-5) en el hígado fetal.
Principales resultados:
- Los ratones mutantes sin E2A muestran un fracaso completo para generar células B maduras.
- La detención del desarrollo de las células B se produce en una etapa temprana, antes de la reorganización de la inmunoglobulina DJ.
- Reducción significativa en las transcripciones de la línea germinal I mu, RAG-1, mb-1, CD19 y lambda 5.
- Reducido, pero detectable, los niveles de B29 y mu grados transcripciones.
- Los niveles de transcripción de Pax-5 disminuyeron notablemente en los hígados fetales de E2A (-/-) ratones.
Conclusiones:
- Los productos E2A juegan un papel crítico y central en las primeras etapas de la diferenciación de las células B.
- E2A es esencial para la expresión adecuada de los genes clave necesarios para el desarrollo de las células B.
- La ausencia de E2A conduce a un profundo bloqueo en la maduración de las células B, impactando en múltiples vías de desarrollo.
Videos de Conceptos Relacionados
Eukaryotic RNA Polymerases
RNA Polymerase (RNAP) is conserved in all animals, with bacterial, archaeal, and eukaryotic RNAPs sharing significant sequence, structural, and functional similarities. Among the three eukaryotic RNAPs, RNA Polymerase II is most similar to bacterial RNAP in terms of both structural organization and folding topologies of the enzyme subunits. However, these similarities are not reflected in their mechanism of action.
All three eukaryotic RNAPs require specific transcription factors, of which the...
All three eukaryotic RNAPs require specific transcription factors, of which the...
Initiation of Translation
Initiating translation is complex because it involves multiple molecules. Initiator tRNA, ribosomal subunits, and eukaryotic initiation factors (eIFs) are all required to assemble on the initiation codon of mRNA. This process consists of several steps that are mediated by different eIFs.
First, the initiator tRNA must be selected from the pool of elongator tRNAs by eukaryotic initiation factor 2 (eIF2). The initiator tRNA (Met-tRNAi) has conserved sequence elements including modified bases at...
First, the initiator tRNA must be selected from the pool of elongator tRNAs by eukaryotic initiation factor 2 (eIF2). The initiator tRNA (Met-tRNAi) has conserved sequence elements including modified bases at...
Immunoglobulin-like Cell Adhesion Molecules
Immunoglobulin-like cell adhesion molecules or Ig-CAMs are a versatile group of cell surface glycoproteins belonging to the immunoglobulin protein superfamily. Ig-CAMs possess the characteristic immunoglobulin protein domains and other domains such as the fibronectin type III domain. The Ig domains are glycosylated to varying degrees in different Ig-CAMs.
Ig-CAMs exhibit either homophilic binding (to other Ig-CAMs) or heterophilic binding (to other ligands such as integrins). While most Ig-CAMs...
Ig-CAMs exhibit either homophilic binding (to other Ig-CAMs) or heterophilic binding (to other ligands such as integrins). While most Ig-CAMs...
Role of Ephrin-Eph Signalling in Intestinal Stem Cell Renewal
Erythropoietin-producing hepatocellular carcinoma receptor (Eph) and its ligand, Eph receptor-interacting protein (Ephrin) were first discovered in the human carcinoma cell line, hence the name. Ephrin-Eph interaction guides cells to reach their appropriate location in adult tissues. They also play an essential role in the immune system by helping in immune cell migration, adhesion, and activation. Based on their structure and function, Eph is divided into two classes — EphA and EphB.
Diversity of Antigen Receptors
Antigen receptors are essential components of the immune system crucial in defending the body against foreign invaders. These receptors are present on the surface of B and T cells, enabling them to recognize antigens and mount an appropriate immune response.
Before encountering any antigen, lymphocytes express these receptors. On B cells, the antigen receptor is a membrane-bound antibody molecule called BCR; on T cells, it is a T cell receptor or TCR. B and T cell receptors are composed of two...
Before encountering any antigen, lymphocytes express these receptors. On B cells, the antigen receptor is a membrane-bound antibody molecule called BCR; on T cells, it is a T cell receptor or TCR. B and T cell receptors are composed of two...
B Cell Activation and Differentiation
The adaptive immune response, a sophisticated defense mechanism, relies on the activation and differentiation of B lymphocytes, or B cells. These processes enable our bodies to mount a tailored response against specific pathogens such as bacteria, free virus particles, toxins, and parasites.
When naive B cells encounter a specific antigen that can bind to the B cell receptor (BCR) on their surface, they undergo sensitization to respond to the antigen's presence. Sensitization begins with...
When naive B cells encounter a specific antigen that can bind to the B cell receptor (BCR) on their surface, they undergo sensitization to respond to the antigen's presence. Sensitization begins with...

