Related Experiment Video
Updated: Aug 10, 2025

10:34
Ultra-long Read Sequencing for Whole Genomic DNA Analysis
Published on: March 15, 2019
22.9K
A Guide to Sequencing for Long Repetitive Regions
1Institute for Advanced Biosciences, Keio University, Tsuruoka City, Yamagata, Japan. ciconia@sfc.keio.ac.jp.
Methods in Molecular Biology (Clifton, N.J.)
|February 13, 2023
Summary
Analyzing genes with repetitive DNA sequences is difficult due to assembly and accuracy issues. This study presents a novel strategy combining overlap-layout-consensus and long-read scaffolding to accurately determine the full length of these challenging repeats.
Area of Science:
- Genomics
- Bioinformatics
- Computational Biology
Background:
- Analyzing genes with highly repetitive sequences presents significant challenges in genomics.
- Short-read assembly methods, like the de Bruijn graph, struggle to differentiate adjacent repeat units.
- Long-read sequencing accuracy remains insufficient for precise identification of individual repeat units.
Purpose of the Study:
- To present a strategy for overcoming challenges in analyzing genes with highly repetitive sequences.
- To achieve full-length determination of long repeats.
- To improve the accuracy of genome assembly for repetitive regions.
Main Methods:
- Combining extraction and assembly of repeat units using overlap-layout-consensus (OLC).
- Utilizing long reads for scaffolding to reconstruct the full repeat structure.
- Integrating short-read and long-read data for enhanced accuracy.
Main Results:
- Successfully obtained the full length of long repeats in challenging genomic regions.
- Demonstrated the effectiveness of the combined OLC and long-read scaffolding approach.
- Overcame limitations of traditional de Bruijn graph assembly for repetitive sequences.
Conclusions:
- The presented strategy effectively addresses the limitations of current assembly algorithms and sequencing accuracy for repetitive DNA.
- This approach enables accurate full-length analysis of genes with highly repetitive sequences.
- The findings contribute to improved genome assembly and analysis of complex genomic structures.
Related Concept Videos
Next-generation Sequencing
91.9K
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....
91.9K
RNA-seq
10.2K
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...
Before the discovery of RNA-seq, microarray-based methods and Sanger sequencing were used for transcriptome analysis. However, while...
10.2K
Sanger Sequencing
755.6K
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...
755.6K
Maxam-Gilbert Sequencing
11.3K
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...
11.3K

