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Native functions of short tandem repeats.

Shannon E Wright1,2,3, Peter K Todd1,4

  • 1Department of Neurology, University of Michigan-Ann Arbor, Ann Arbor, United States.

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Short tandem repeats (STRs) are crucial for gene regulation, not just disease. Understanding their normal functions offers new insights into neurological diseases and neuronal function.

Keywords:
Fragile Xautismdisease mechanismgene expressiongeneticsgenomic instabilitygenomicsneurodegeneration

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Area of Science:

  • Genomics
  • Molecular Biology
  • Neuroscience

Background:

  • Over a third of the human genome consists of repetitive sequences, including millions of short tandem repeats (STRs).
  • Pathologic consequences of repeat expansions causing human diseases are well-studied, but native functions of STRs are often overlooked.
  • STRs play a significant role in regulating gene expression.

Purpose of the Study:

  • To summarize research on the normal biological functions of repetitive genomic elements, focusing on STRs.
  • To propose a new perspective on repeat expansion disorders as disruptions of normal gene regulation.
  • To predict broader roles for STRs in neuronal function and common neurological diseases.

Main Methods:

  • Literature review and synthesis of current research on repetitive elements and STRs.
  • Analysis of existing studies on gene expression regulation by STRs.
  • Conceptual framework development for understanding repeat expansions.

Main Results:

  • STRs are integral to normal biological functions, particularly in regulating gene expression.
  • Existing research supports the role of STRs in various cellular processes.
  • A paradigm shift is needed to view pathogenic repeat expansions as dysregulation of normal STR functions.

Conclusions:

  • STRs have critical native functions, especially in gene regulation.
  • Reconceptualizing repeat expansions as regulatory aberrations opens new research avenues.
  • STRs are likely to be implicated in broader aspects of neuronal function and common neurological disease risk.