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Updated: Jun 7, 2025

Observation and Quantification of Telomere and Repetitive Sequences Using Fluorescence In Situ Hybridization FISH with PNA Probes in Caenorhabditis elegans
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TeloSearchLR: an algorithm to detect novel telomere repeat motifs using long sequencing reads.

George Chung, Fabio Piano, Kristin C Gunsalus

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    Summary

    TeloSearchLR identifies novel telomeric repeat motifs (TRMs) in long DNA sequencing reads, overcoming limitations of short-read tools. This method aids in discovering new TRMs and anchoring genome assemblies.

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    Area of Science:

    • Genomics
    • Bioinformatics
    • Molecular Biology

    Background:

    • Telomeres protect eukaryotic chromosome ends but exhibit species-specific sequence variations.
    • Existing bioinformatic tools struggle to identify novel telomeric repeat motifs (TRMs) in many sequencing datasets.
    • Short DNA reads lack positional context, hindering the identification of telomeric sequences.

    Purpose of the Study:

    • To develop a novel algorithm for identifying telomeric repeat motifs (TRMs) using long sequencing reads.
    • To overcome the limitations of current short-read-based methods for TRM discovery.
    • To explore evolutionary divergence in telomeric sequences and improve genome assembly.

    Main Methods:

    • Developed the TeloSearchLR algorithm, leveraging the property that telomeric sequences appear at the ends of long reads.
    • Applied TeloSearchLR to analyze sequencing libraries where short-read tools failed to identify novel TRMs.
    • Utilized TeloSearchLR for identifying unusually long telomeric motifs and anchoring terminal scaffolds in genome assemblies.

    Main Results:

    • TeloSearchLR successfully identified novel telomeric repeat motifs (TRMs) in cases where short-read methods failed.
    • The algorithm revealed unusually long telomeric motifs not typically maintained by telomerase.
    • TeloSearchLR proved effective in anchoring terminal scaffolds for new genome assemblies.

    Conclusions:

    • TeloSearchLR is a powerful tool for discovering novel telomeric repeat motifs (TRMs) in long sequencing reads.
    • The algorithm enhances our understanding of telomere evolution and sequence divergence.
    • TeloSearchLR offers practical applications in genome assembly and the study of telomere biology.