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Related Concept Videos

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Genome Annotation and Assembly

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The genome refers to all of the genetic material in an organism. It can range from a few million base pairs in microbial cells to several billion base pairs in many eukaryotic organisms. Genome assembly refers to the process of taking the DNA sequencing data and putting it all back together in a correct order to create a close representation of the original genome. This is followed by the identification of functional elements on the newly assembled genome, a process called genome annotation.
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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.
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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...
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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.
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Related Experiment Video

Updated: Apr 18, 2026

Novel Sequence Discovery by Subtractive Genomics
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Novel Sequence Discovery by Subtractive Genomics

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A fast sequence assembly method based on compressed data structures.

Peifeng Liang, Yancong Zhang, Kui Lin

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    |January 9, 2015
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    Summary
    This summary is machine-generated.

    A new genome assembly tool, FMJ-Assembler, uses FM-index and jumping extension to significantly reduce memory and CPU time for next-generation sequencing data.

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    Area of Science:

    • Bioinformatics
    • Computational Biology
    • Genomics

    Background:

    • Genome assembly from next-generation sequencing (NGS) data is computationally intensive, demanding substantial memory and processing time.
    • Existing assemblers often face limitations in scalability and efficiency when handling large datasets.

    Purpose of the Study:

    • To develop a novel genome assembler, FMJ-Assembler, that addresses the memory and time efficiency challenges in NGS data assembly.
    • To improve the performance of the JR-Assembler by integrating advanced indexing and extension techniques.

    Main Methods:

    • The FMJ-Assembler integrates an expanded FM-index and Burrows-Wheeler Transform (BWT) for efficient data compression of sequencing reads.
    • A jumping extension method is employed to accelerate the CPU time required for the assembly process.

    Main Results:

    • FMJ-Assembler demonstrates significant reductions in memory usage compared to existing assemblers.
    • The assembler achieves lower CPU time, indicating faster processing speeds.
    • Assembly quality is comparable or superior to current state-of-the-art methods.

    Conclusions:

    • FMJ-Assembler offers a memory and time-efficient solution for assembling large genomes from NGS data.
    • The developed method presents a promising advancement for the field of genomic data analysis.
    • FMJ-Assembler is poised to become a valuable tool in next-generation sequencing technologies.