Video Experimental Relacionado

Updated: Feb 11, 2026

Identification of Mouse and Human Antibody Repertoires by Next-Generation Sequencing

Identification of Mouse and Human Antibody Repertoires by Next-Generation Sequencing

Published on: March 15, 2019

Una reorganización inusual del gen de la inmunoglobulina conduce a la sustitución de las secuencias de señales

E Morzycka-Wroblewska¹, F E Lee, S V Desiderio

¹Howard Hughes Medical Institute Laboratory of Genetics, Johns Hopkins University School of Medicine, Baltimore, MD 21205.

Science (New York, N.Y.)

|October 14, 1988

Resumen

Se descubrió una nueva reorganización del gen de la inmunoglobulina, el reemplazo de la secuencia de señales. Este proceso fusiona secuencias de señales con segmentos de genes, aumentando potencialmente la diversidad de anticuerpos y alterando la orientación de los genes.

Área de la Ciencia:

Inmunología Inmunología.
Biología Molecular Biología Molecular
Genética La genética.

Sus antecedentes:

La reorganización genética de las inmunoglobulinas es crucial para la inmunidad adaptativa.
El proceso de recombinación V(D) J genera diversidad de anticuerpos.
Comprender los nuevos mecanismos de reorganización es clave para descifrar la complejidad del sistema inmunológico.

Objetivo del estudio:

Identificar y caracterizar un mecanismo de reordenamiento genético de inmunoglobulinas no reconocido anteriormente.
Investigar las implicaciones de este nuevo mecanismo en la orientación de genes de anticuerpos y la diversidad.
Para dilucidar los eventos moleculares subyacentes a esta vía de recombinación alternativa.

Principales métodos:

Análisis de los reordenamientos genéticos de las inmunoglobulinas.
La clonación molecular y la secuenciación de segmentos de genes reordenados.
Análisis bioinformático de los intermediarios y resultados de la recombinación.

Principales resultados:

Observó un nuevo reordenamiento denominado "reemplazo de secuencia de señal".
Fusión demostrada de secuencias de señales recombinantes intactas a los elementos DJH.
Identificó la pérdida potencial de nucleótidos de las secuencias de codificación DJH.
Resolución alternativa propuesta de los intermediarios de recombinación como el mecanismo.

Conclusiones:

La sustitución de la secuencia de señales ofrece un nuevo mecanismo para alterar la orientación del gen de la inmunoglobulina.
Esta vía proporciona un nuevo medio para generar diversidad de anticuerpos in vivo.
Los hallazgos amplían nuestra comprensión de la base molecular de la inmunidad adaptativa.

Más Videos Relacionados

Immunoglobulin Gene Sequence Analysis In Chronic Lymphocytic Leukemia: From Patient Material To Sequence Interpretation

Immunoglobulin Gene Sequence Analysis In Chronic Lymphocytic Leukemia: From Patient Material To Sequence Interpretation

Published on: November 26, 2018

VDJ-Seq: Deep Sequencing Analysis of Rearranged Immunoglobulin Heavy Chain Gene to Reveal Clonal Evolution Patterns of B Cell Lymphoma

VDJ-Seq: Deep Sequencing Analysis of Rearranged Immunoglobulin Heavy Chain Gene to Reveal Clonal Evolution Patterns of B Cell Lymphoma

Published on: December 28, 2015

Videos de Conceptos Relacionados

Unusual Results

Unusual Results

Unusual results are those that have a very low chance of occurring. Unusual results can be identified using probabilities and the range rule of thumb. In problems involving probability, unusual results can be observed in 2 instances – an unusually high number of successes or an unusually low number of successes.
According to the range rule of thumb, any value above or below two standard deviations, 2σ from the mean, μ is considered unusual.
Maximum unusual value =...

Recombinant DNA

Recombinant DNA

Signal Sequences and Sorting Receptors

Signal Sequences and Sorting Receptors

Signal sequences are short amino acid sequences that guide newly synthesized proteins to their proper location within the cell. Classical signal sequences are fifteen to sixty amino acids long and present at the N-terminus of a polypeptide chain. Each signal sequence has a conserved segment of basic residues towards their N terminus, a hydrophobic core, and a C-terminus rich in polar residues. The C-terminus also contains a signal cleavage site and features a -3 -1 sequence motif. The -3-1...

Export of Mitochondrial and Chloroplast Genes

Export of Mitochondrial and Chloroplast Genes

A eukaryotic cell can have up to three different types of genetic systems: nuclear, mitochondrial, and chloroplast. During evolution, organelles have exported many genes to the nucleus; this transfer is still ongoing in some plant species. Approximately 18% of the Arabidopsis thaliana nuclear genome is thought to be derived from the chloroplast’s cyanobacterial ancestor, and around 75% of the yeast genome derived from the mitochondria’s bacterial ancestor. This export has occurred...

Overview of Transposition and Recombination

Overview of Transposition and Recombination

Transposons make up a significant part of genomes of various organisms. Therefore, it is believed that transposition played a major evolutionary role in speciation by changing genome sizes and modifying gene expression patterns. For example, in bacteria, transposition can lead to conferring antibiotic resistance. Movement of transposable elements within the genetic pool of pathogenic bacteria can aid in transfer of antibiotic-resistant genetic elements. In eukaryotes, transposons can carry out...

z Scores and Unusual Values

z Scores and Unusual Values

The z score is one of the three measures of relative standing. It describes the location of a value in a dataset relative to the mean. z scores are obtained after the standardization of the values in a dataset. The z score for the mean is 0.
This score indicates how far a value is from the mean in terms of standard deviation. For example, if a data value has a z score of +1, the researcher can infer that the particular data value is one standard deviation above the mean. If another data...