Construction of Whole Genomes from Scaffolds Using Single Cell Strand-Seq Data

Area of Science:

• Genomics
• Molecular Biology
• Bioinformatics

Background:

• High-quality reference genomes are crucial for molecular biology and genomics research.
• Accurate genome assembly relies on correctly organizing DNA fragments like contigs and scaffolds.
• Previous work identified misoriented regions in human and mouse genomes using Strand-seq.

Purpose of the Study:

• To demonstrate Strand-seq's capability in building and correcting full-length chromosomes.
• To identify scaffolds belonging to the same chromosome and determine their order and orientation.
• To improve genome assembly quality without relying on overlapping sequences.

Main Methods:

• Utilizing Strand-seq, a single-cell sequencing technique preserving DNA directionality.
• Applying genetic mapping principles based on template strand inheritance.
• Clustering and ordering DNA scaffolds solely based on DNA strand directionality.

Main Results:

• Strand-seq effectively maps assembly fragments into chromosome-sized clusters.
• The method accurately determines scaffold order and orientation without new assembly data.
• Improved genome assemblies were generated for ferret, pig, Xenopus, zebrafish, Tasmanian devil, and Guinea pig.

Conclusions:

• Strand-seq is a powerful tool for constructing and correcting chromosome-level genome assemblies.
• The technique enables precise ordering and orientation of DNA fragments based on strand inheritance.
• This approach significantly enhances the accuracy and completeness of reference genomes.