RepeatOBserver: Tandem Repeat Visualisation and Putative Centromere Detection.

Area of Science:

• Genomics
• Bioinformatics
• Molecular Biology

Background:

• Tandem repeats are crucial for centromere structure, gene regulation, and genome stability.
• Identifying centromere locations is vital for accurate genome annotation but remains challenging.

Purpose of the Study:

• To introduce RepeatOBserver, a novel computational tool for visualizing DNA repeat patterns.
• To enable the identification of putative centromere locations in genome assemblies.

Main Methods:

• Utilized Fourier transform of DNA walks to analyze repeat distribution.
• Developed RepeatOBserver for visualizing perfect and imperfect repeats (3-5000 bp) without prior sequence knowledge.
• Applied genomic Shannon diversity index and repeat abundance sum for centromere prediction based on repeat types.

Main Results:

• RepeatOBserver heatmaps effectively distinguish between tandem and retrotransposon repeats.
• 93% of tandem repeat centromeres and 97% of retrotransposon centromeres were accurately predicted in analyzed chromosomes.
• The tool identified other genomic regions like neocentromeres and gene copy variations.

Conclusions:

• RepeatOBserver is a flexible and effective tool for comprehensive repeat pattern characterization in genome assemblies.
• It facilitates the visualization and identification of centromeres and other regions of interest.
• The tool aids in understanding the role of repeats in genome structure and function.