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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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Related Experiment Video

Updated: May 4, 2026

Ultra-long Read Sequencing for Whole Genomic DNA Analysis

Ultra-long Read Sequencing for Whole Genomic DNA Analysis

Published on: March 15, 2019

Reconstructing complex regions of genomes using long-read sequencing technology.

John Huddleston¹, Swati Ranade, Maika Malig

¹Department of Genome Sciences, University of Washington, Seattle, Washington 98195, USA;

Genome Research

|January 15, 2014

Summary

Long-read single molecule, real-time (SMRT) sequencing resolves complex genomic regions efficiently. This cost-effective method improves genome assembly quality, overcoming limitations of previous technologies.

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Amplicon Sequencing using the Long-Read Sequencing Technologies

Amplicon Sequencing using the Long-Read Sequencing Technologies

Published on: August 29, 2025

Area of Science:

Genomics and Bioinformatics
Molecular Biology

Background:

Achieving high-quality genome assemblies, particularly in complex duplicated regions, remains a significant challenge.
Traditional methods like Sanger sequencing for genome finishing are costly, laborious, and largely abandoned.
Next-generation sequencing hybrid approaches often leave complex regions unresolved.

Purpose of the Study:

To demonstrate the efficacy of long-read single molecule, real-time (SMRT) sequencing for resolving complex genomic regions.
To evaluate the cost-effectiveness and speed of SMRT sequencing compared to traditional methods for genome finishing.

Main Methods:

Utilized Pacific Biosciences (PacBio) SMRT sequencing technology to analyze bacterial artificial chromosome (BAC) clones.
Sequenced and assembled a 1.3-Mbp complex region on human chromosome 17q21.31.
Applied Illumina sequencing to validate variants and targeted a duplicated region in the chimpanzee genome.

Main Results:

Achieved high sequence continuity and 99.994% identity to Sanger assemblies for the human chromosome 17 region.
PacBio and Sanger assemblies showed comparable numbers of validated variants, with different sequence context biases.
Successfully resolved a complex 766-kbp duplicated region in the chimpanzee genome at reduced cost and time.

Conclusions:

Long-read SMRT sequencing provides a cost-effective and efficient solution for resolving complex genomic regions.
This technology offers a viable path to upgrade existing genome assemblies to a higher finished state.
PacBio sequencing facilitates accurate genome finishing, overcoming limitations of previous sequencing technologies.