Related Experiment Video
Updated: Aug 12, 2026
12:37
Pyrosequencing for Microbial Identification and Characterization
Published on: August 22, 2013
Adenine specific DNA chemical sequencing reaction
1Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena 91125.
Nucleic Acids Research
|October 12, 1987
Summary
This study introduces a new chemical DNA sequencing method using potassium tetrachloroplatinate (K2PdCl4) for specific adenine (A) cleavage. The protocol offers a simple, selective approach for A residue analysis in DNA sequencing.
Area of Science:
- Biochemistry
- Molecular Biology
- Chemical Biology
Background:
- DNA sequencing is crucial for understanding genetic information.
- Current chemical sequencing methods offer specific base modifications but can be complex.
- A need exists for simple, selective chemical methods for DNA base analysis.
Purpose of the Study:
- To investigate the reaction of DNA with K2PdCl4 for selective cleavage.
- To characterize the mechanism of K2PdCl4-mediated DNA modification.
- To evaluate the potential of this reaction as a DNA sequencing tool.
Main Methods:
- Incubation of DNA with K2PdCl4 at pH 2.0.
- Piperidine workup to induce strand cleavage.
- Analysis of reaction products to identify cleavage sites.
- Comparison of reaction efficiency with methylated and unmethylated adenine residues.
Main Results:
- K2PdCl4 selectively induces depurination at adenine (A) residues.
- The reaction proceeds via an excision mechanism similar to established sequencing methods.
- Methylation at the N6 position of adenine reduces reaction efficiency.
- The protocol demonstrates specificity for adenine bases.
Conclusions:
- A novel, simple chemical method for selective adenine cleavage in DNA has been developed.
- This K2PdCl4-based reaction is analogous to existing chemical DNA sequencing strategies.
- The method shows potential as a valuable addition to current DNA sequencing techniques, particularly for adenine-specific analysis.
Related Concept Videos
01:43Proofreading
Synthesis of new DNA molecules starts when DNA polymerase links nucleotides together in a sequence that is complementary to the template DNA strand. DNA polymerase has a higher affinity for the correct base to ensure fidelity in DNA replication. The DNA polymerase furthermore proofreads during replication, using an exonuclease domain that cuts off incorrect nucleotides from the nascent DNA strand.Errors during Replication Are Corrected by the DNA Polymerase EnzymeGenomic DNA is synthesized in...
02:27DNA Base Pairing
Erwin Chargaff’s rules on DNA equivalence paved the way for the discovery of base pairing in DNA. Chargaff’s rules state that in a double-stranded DNA molecule,
01:57Sanger 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...
03:00Next-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.
Next-Generation Sequencing Methods
Although all next-generation methods use different technologies, they all share a set of standard features.
03:21RNA-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.
Before the discovery of RNA-seq, microarray-based methods and Sanger sequencing were used for transcriptome analysis. However, while microarray-based...
Before the discovery of RNA-seq, microarray-based methods and Sanger sequencing were used for transcriptome analysis. However, while microarray-based...
01:05Maxam-Gilbert Sequencing
In the same year as the discovery of the Sanger sequencing method, another group of scientists, Allan Maxam and Walter Gilbert, demonstrated their chemical-cleavage method for DNA sequencing. The Maxam-Gilbert method relies on using different chemicals that can cleave the DNA sequence at specific sites, the separation of resulting DNA fragments of variable size using electrophoresis, and deciphering the DNA sequence from the resulting gel bands.
Challenges of the Maxam-Gilbert Method
The...
Challenges of the Maxam-Gilbert Method
The...