Video Experimental Relacionado
Updated: Nov 18, 2025
07:55
Generation of Escape Variants of Neutralizing Influenza Virus Monoclonal Antibodies
Published on: August 29, 2017
12.0K
Las deleciones recurrentes en el escape de anticuerpos del pico de glicoproteína del SARS-CoV-2
Kevin R McCarthy1,2,3, Linda J Rennick4,2, Sham Nambulli4,2
1Center for Vaccine Research, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA. krm@pitt.edu pduprex@pitt.edu.
Science (New York, N.Y.)
|February 4, 2021
Resumen
Las deleciones recurrentes en las proteínas del pico del SARS-CoV-2 ayudan a los virus a evadir las respuestas inmunes. Estas deleciones aceleran la evolución y adaptación viral, ayudando a la propagación de nuevos linajes.
Área de la Ciencia:
- Virología
- Inmunología
- Biología evolutiva
Sus antecedentes:
- Las pandemias zoonóticas, como la causada por el síndrome respiratorio agudo severo coronavirus 2 (SARS-CoV-2), surgen cuando los virus animales infectan a las poblaciones humanas.
- Los virus se adaptan a los huéspedes humanos, desarrollando mecanismos para evadir la presión del sistema inmunológico.
- Los coronavirus muestran una tasa de sustitución más lenta en comparación con otros virus de ARN.
Objetivo del estudio:
- Para investigar cómo los coronavirus, específicamente el SARS-CoV-2, superan su tasa de sustitución lenta.
- Identificar los mecanismos que impulsan la adaptación viral y la evasión inmune en el SARS-CoV-2.
- Comprender el papel de las deleciones en la glicoproteína de punta del SARS-CoV-2.
Principales métodos:
- Análisis de las secuencias genéticas virales para identificar las deleciones recurrentes en la glicoproteína de punta.
- Mapeo de las deleciones a epítopos de anticuerpos y regiones de deleción recurrente (RDR).
- Evaluar la eficiencia de transmisión y la prevalencia de las variantes de eliminación en los linajes globales de SARS-CoV-2.
Principales resultados:
- Se encontró que las deleciones recurrentes en la glicoproteína del pico del SARS-CoV-2 contrarrestan la tasa de sustitución lenta del virus.
- Estas variantes de eliminación surgen en diversas poblaciones, se transmiten de manera eficiente y se encuentran en linajes significativos a nivel mundial.
- Las deleciones dentro de los RDR, que corresponden a epítopos de anticuerpos, confieren resistencia a los anticuerpos neutralizantes.
Conclusiones:
- Las deleciones en las glicoproteínas de picos del SARS-CoV-2 parecen acelerar la evolución antigénica.
- Estas deleciones pueden desempeñar un papel más amplio en la conducción de la evolución adaptativa del SARS-CoV-2.
- Comprender estos mecanismos de eliminación es crucial para manejar la evolución viral y las amenazas pandémicas.
Más Videos Relacionados
14:23A Restriction Enzyme Based Cloning Method to Assess the In vitro Replication Capacity of HIV-1 Subtype C Gag-MJ4 Chimeric Viruses
Published on: August 31, 2014
15.9K
08:07Author Spotlight: Advancing Antiviral Strategies Through Novel Immunocapture and Mass Spectrometry Techniques
Published on: January 12, 2024
1.0K
Videos de Conceptos Relacionados
00:36Viral Mutations
37.5K
A mutation is a change in the sequence of bases of DNA or RNA in a genome. Some mutations occur during replication of the genome due to errors made by the polymerase enzymes that replicate DNA or RNA. Unlike DNA polymerase, RNA polymerase is prone to errors because it is not capable of “proofreading” its work. Viruses with RNA-based genomes, like HIV, therefore accrue mutations faster than viruses with DNA-based genomes. Because mutation and recombination provide the raw material...
37.5K
02:28Leaky Scanning
5.4K
During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA. Marilyn Kozak discovered that the sequence RCCAUGG (where R...
5.4K
01:05Single Nucleotide Polymorphisms-SNPs
17.3K
A single nucleotide polymorphism or SNP is a single nucleotide variation at a specific genomic position in a large population. It is the most prevalent type of sequence variation found in the human genome. Point mutations that occur in more than 1% of the population qualify as SNPs. These are present once every 1000 nucleotides on an average in the human genome. Replacement of a purine with another purine (A/G) or a pyrimidine with another pyrimidine (C/T) is known as a transition. In contrast,...
17.3K
02:50Conjugated Proteins
23.9K
Simple proteins and protein complexes contain only amino acids. In contrast, many other proteins, called conjugated proteins, covalently bond with non-protein moieties.
Nucleoproteins are protein complexes that contain nucleic acids, categorized as deoxyribonucleoproteins (DNPs) or ribonucleoproteins (RNPs) respectively. The nucleosome is a typical example of a DNP where nuclear DNA is associated with histone proteins. The major antigen for the Covid-19 virus SARS-CoV is an RNP that is critical...
Nucleoproteins are protein complexes that contain nucleic acids, categorized as deoxyribonucleoproteins (DNPs) or ribonucleoproteins (RNPs) respectively. The nucleosome is a typical example of a DNP where nuclear DNA is associated with histone proteins. The major antigen for the Covid-19 virus SARS-CoV is an RNP that is critical...
23.9K
00:57Viral Recombination
24.4K
Cells are sometimes infected by more than one virus at once. When two viruses disassemble to expose their genomes for replication in the same cell, similar regions of their genomes can pair together and exchange sequences in a process called recombination. Alternatively, viruses with segmented genomes can swap segments in a process called reassortment.
24.4K