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Next-generation Sequencing03:00

Next-generation Sequencing

The first human genome sequencing project cost $2.7 billion and was declared complete in 2003, after 15 years of international cooperation and collaboration between several research teams and funding agencies. Today, with the advent of next-generation sequencing technologies, the cost and time of sequencing a human genome have dropped over 100 fold.
Next-Generation Sequencing Methods
Although all next-generation methods use different technologies, they all share a set of standard features.
Sanger Sequencing01:57

Sanger Sequencing

DNA sequencing is a fundamental technique that is routinely used in the biological sciences. This method can be applied to a range of questions at different scales - from the sequencing of a cloned DNA fragment or the study of a mutation in a gene up to whole-genome sequencing. However, despite the widespread use of sequencing today, it was not until 1977 that Fredrick Sanger and his collaborators developed the chain-termination method to decode DNA sequences. It relies on the separation of a...
RNA-seq03:21

RNA-seq

RNA sequencing, or RNA-Seq, is a high-throughput sequencing technology used to study the transcriptome of a cell. Transcriptomics helps to interpret the functional elements of a genome and identify the molecular constituents of an organism. Additionally, it also helps in understanding the development of an organism and the occurrence of diseases. 
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The Replisome03:01

The Replisome

DNA replication is carried out by a large complex of proteins that act in a coordinated matter to achieve high-fidelity DNA replication. Together this complex is known as the DNA replication machinery or the replisome.
The synthesis of the leading and lagging strands is a highly coordinated process. To explain this, the “Trombone model” was proposed by Bruce Alberts in 1980. The DNA loop formation starts when a primer is synthesized on the parent lagging strand. The loop grows with the...
Lagging Strand Synthesis01:59

Lagging Strand Synthesis

During replication, the complementary strands in double-stranded DNA are synthesized at different rates. Replication first begins on the leading strand. Replication starts later, occurs more slowly, and proceeds discontinuously on the lagging strand.
There are several major differences between synthesis of the leading strand and synthesis of the lagging strand. 1) Leading strand synthesis happens in the direction of replication fork opening, whereas lagging strand synthesis happens in the...
Real Time RT-PCR02:57

Real Time RT-PCR

Real-time reverse transcription-polymerase chain reaction, or Real-time RT-PCR, is an analytical tool used to determine the expression level of target genes. The method involves converting mRNA to complementary DNA with the help of an enzyme known as reverse transcriptase, followed by the PCR amplification of the cDNA. These two processes can be performed simultaneously in a single tube or separately as a two-step reaction.
The real-time quantification of the number of amplified products is...

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Updated: Jun 27, 2026

Single-Molecule Fluorescence Visualization of DNA Polymerase Dynamics at G-Quadruplexes
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Single-Molecule Fluorescence Visualization of DNA Polymerase Dynamics at G-Quadruplexes

Published on: April 4, 2025

Secuenciación de ADN en tiempo real de moléculas de una sola polimerasa.

John Eid1, Adrian Fehr, Jeremy Gray

  • 1Pacific Biosciences, 1505 Adams Drive, Menlo Park, CA 94025, USA.

Science (New York, N.Y.)
|November 22, 2008
PubMed
Resumen

Este estudio demuestra la secuenciación de ADN en tiempo real utilizando nucleótidos y nanoestructuras etiquetados con fluorescencia. El método logra una alta precisión, revelando la dinámica de la polimerasa y las estructuras secundarias del ADN durante la síntesis.

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Last Updated: Jun 27, 2026

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Área de la Ciencia:

  • La bioquímica es la bioquímica.
  • Biología Molecular Biología Molecular
  • La genómica es la genómica.

Sus antecedentes:

  • La secuenciación precisa del ADN es crucial para comprender los procesos biológicos y las enfermedades.
  • Los métodos anteriores se enfrentaban a limitaciones en la observación y precisión en tiempo real.

Objetivo del estudio:

  • Desarrollar un método de secuenciación de ADN en tiempo real de una sola molécula.
  • Para analizar la dinámica de la ADN polimerasa e identificar las características dependientes de la secuencia.

Principales métodos:

  • Utilizó matrices de nanoestructura de guía de onda de modo cero para la detección paralela de una sola molécula.
  • Se emplean trifosfatos de desoxirribonucleósidos (dNTP) con etiqueta fluorescente conjugados con fosfatos terminales.
  • Monitoreo de la incorporación enzimática en tiempo real en miles de bases.

Principales resultados:

  • Se logró la observación continua de la síntesis de ADN sin obstáculo estérico.
  • Identificó distintos estados de polimerasa y sitios de pausa vinculados a las estructuras secundarias del ADN.
  • Se generaron secuencias de consenso con una precisión media del 99,3%.

Conclusiones:

  • Este nuevo enfoque de secuenciación proporciona información directa sobre la cinética de la polimerasa.
  • El método determina con precisión las secuencias de ADN y revela los parámetros biofísicos de la polimerización.
  • Se ha demostrado una alta precisión y potencial para identificar errores específicos de la secuencia.