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Identification of Mouse and Human Antibody Repertoires by Next-Generation Sequencing
Published on: March 15, 2019
Estructura de la respuesta inmune murina I-A beta locus: secuencia del gen beta I-A y un exón de segundo dominio de
Cell
|August 1, 1983
Resumen
Los investigadores identificaron el gen beta I-A completo y un exón A beta 2 separado dentro del complejo de histocompatibilidad mayor del ratón. Este hallazgo aclara la relación estructural entre las cadenas beta I-A del ratón y las cadenas beta DC humanas.
Área de la Ciencia:
- Inmunogenética La inmunogenética.
- Biología Molecular Biología Molecular
Sus antecedentes:
- La región I del complejo mayor de histocompatibilidad (MHC) murino codifica antígenos cruciales de clase II, incluidos I-A e I-E.
- Comprender la organización genética y la homología de secuencias de estos antígenos es vital para comprender las respuestas inmunes.
Objetivo del estudio:
- Para aislar y caracterizar el gen beta I-A y un exón relacionado de una biblioteca de ADN de bazo de ratón.
- Para determinar la relación estructural entre los antígenos murinos I-A y las cadenas beta humanas de clase II.
Principales métodos:
- Cribado de un bazo de ratón Biblioteca de ADN cosmida (haplotipo b).
- Aislamiento de un clon cósmido que contiene el gen beta I-A y el exón A beta 2.
- Análisis de secuencias y comparaciones de homologías de secuencias de aminoácidos traducidas.
Principales resultados:
- Se aislaron todo el gen beta I-A (más de 6 kb, seis exones) y un exón A beta 2 separado.
- La secuencia beta A traducida muestra una homología del 73% con las cadenas beta DC humanas, lo que indica una correspondencia estructural.
- La secuencia de exones A beta 2 demuestra una homología significativa con las regiones conservadas de los segundos dominios de la cadena beta de clase II en todas las especies.
Conclusiones:
- El antígeno murino I-A es estructuralmente equivalente a los antígenos humanos de clase DC II basados en la homología de la secuencia de la cadena beta.
- El exón A beta 2 representa un elemento genético distinto dentro de la región MHC clase II.
- Se necesitan más investigaciones para identificar un potencial exón de primer dominio para A beta 2.
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