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Antibodies, also known as immunoglobulins (Ig), are essential players of the adaptive immune system. These antigen-binding proteins are produced by B cells and make up 20 percent of the total blood plasma by weight. In mammals, antibodies fall into five different classes, which each elicits a different biological response upon antigen binding.
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Antibodies, or immunoglobulins, are critical players in the immune system's arsenal against invading pathogens. Produced by B cells and plasma cells, their primary role is to detect and bind to specific antigens, molecules found on the surface of pathogens like bacteria or viruses. Beyond antigen recognition, antibodies perform several vital functions that contribute to immune defense.
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Los anticuerpos funcionales muestran coherencia de cadena ligera

David B Jaffe1, Payam Shahi2, Bruce A Adams2

  • 110x Genomics, Pleasanton, CA, USA. 99.david.b.jaffe@gmail.com.

Nature
|October 26, 2022
PubMed
Resumen
Este resumen es generado por máquina.

Los anticuerpos funcionales exhiben "coherencia de cadena ligera", donde las cadenas pesadas determinan predominantemente el uso de cadenas ligeras, a diferencia de los anticuerpos ingenuos que se repiten por casualidad. Esto revela procesos deterministas en la inmunidad adaptativa.

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Área de la Ciencia:

  • Inmunología
  • La genética
  • Biología molecular

Sus antecedentes:

  • El sistema inmune adaptativo genera diversidad de anticuerpos a través de la recombinación V(D) J.
  • Los anticuerpos consisten en cadenas pesadas y ligeras, cada una con regiones determinantes de complementariedad (CDR) cruciales para la unión al antígeno.
  • Los clonotipos públicos, células B que comparten cadenas pesadas idénticas y secuencias CDRH3, se encuentran en todos los individuos.

Objetivo del estudio:

  • Investigar la asociación entre el uso de genes de cadena pesada y ligera en tipos de clonación públicos.
  • Determinar si el estado funcional del anticuerpo (ingenuo frente a la memoria) influye en la selección de la cadena ligera.
  • Explorar las implicaciones de los patrones observados para la recombinación de V (D) J y la selección inmune.

Principales métodos:

  • Análisis del uso de genes de cadena pesada y ligera en tipos de clonación públicos de diferentes donantes.
  • Comparación de la probabilidad de uso de genes de cadena ligera entre anticuerpos de células B ingenuos y de memoria.
  • Examen de la recurrencia de la cadena pesada en los donantes individuales.

Principales resultados:

  • Los anticuerpos ingenuos muestran una baja probabilidad (~10%) de compartir el mismo gen de cadena ligera V dentro de los clonotipos públicos.
  • Los anticuerpos de memoria (funcionales) muestran una alta probabilidad (~80%) de compartir el mismo gen de cadena ligera V, denominado "coherencia de cadena ligera".
  • Esta coherencia también se observa con cadenas pesadas similares recurrentes dentro de un solo donante.

Conclusiones:

  • La recurrencia de anticuerpos ingenuos parece estocástica, mientras que los anticuerpos funcionales muestran un determinismo significativo.
  • La coherencia de la cadena ligera en los anticuerpos funcionales sugiere una fuerte influencia de la cadena pesada en la selección de la cadena ligera.
  • Estos hallazgos ponen de relieve las limitaciones y los factores deterministas en los procesos de recombinación y selección inmune adaptativa de V ((D) J.