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Genome comparison is one of the excellent ways to interpret the evolutionary relationships between organisms. The basic principle of genome comparison is that if two species share a common feature, it is likely encoded by the DNA sequence conserved between both species. The advent of genome sequencing technologies in the late 20th century enabled scientists to understand the concept of conservation of domains between species and helped them to deduce evolutionary relationships across diverse...
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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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Detection of Rare Mutations in CtDNA Using Next Generation Sequencing
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Defining a tandem repeat catalog and variation clusters for genome-wide analyses and population databases.

Ben Weisburd1, Egor Dolzhenko2, Mark F Bennett3

  • 1Program in Medical and Population Genetics, Broad Center for Mendelian Genomics, Broad Institute of MIT and Harvard, Cambridge, MA, USA; Center for Genomic Medicine, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA.

American Journal of Human Genetics
|April 23, 2026
PubMed
Summary
This summary is machine-generated.

A new tandem repeat (TR) catalog addresses inconsistencies in genomic analysis by providing a unified, annotated resource. This catalog distinguishes between isolated repeats and variation clusters for improved genotyping and sequence-level studies.

Keywords:
HiFiSTRsVNTRslong readsequencingshort readtandem repeat catalogstandem repeats

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Area of Science:

  • Genomics
  • Bioinformatics
  • Population Genetics

Background:

  • Tandem repeat (TR) catalogs are crucial for repeat genotyping, defining genomic locations and motifs.
  • Existing TR catalogs vary significantly in size and locus definitions, risking data fragmentation.
  • Divergent catalogs can lead to confusion and incompatibility across population genetics resources.

Purpose of the Study:

  • To compare existing TR catalogs and identify features of a comprehensive genome-wide catalog.
  • To present a new, richly annotated TR catalog for genome-wide and population analyses.
  • To stratify TRs into distinct types for tailored analytical approaches.

Main Methods:

  • Comparison of existing tandem repeat catalogs.
  • Development of a new, annotated genome-wide TR catalog.
  • Algorithm leveraging long-read HiFi sequencing data to stratify TRs.
  • Annotation and sharing of TR catalog, variation clusters, and annotations via the TRExplorer portal.

Main Results:

  • A new, comprehensive, and richly annotated TR catalog has been developed.
  • TRs are stratified into isolated repeats and variation clusters using long-read sequencing data.
  • The TRExplorer portal provides access to the catalog and associated data for analysis support.

Conclusions:

  • A unified TR catalog is essential to mitigate fragmentation and incompatibility in genomic studies.
  • The new catalog and stratification method enhance the analysis of TR variation in population datasets.
  • The TRExplorer portal facilitates the selection and interpretation of TR loci in genetic analyses.