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Human genetics as a tool to identify progranulin regulators.

Alexandra M Nicholson1, NiCole A Finch, Rosa Rademakers

  • 1Department of Neuroscience, Mayo Clinic, 4500 San Pablo Road, Jacksonville, FL 32224, USA.

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Genetic studies reveal key regulators of progranulin, essential for treating frontotemporal lobar degeneration (FTLD). Understanding these genetic factors offers new therapeutic avenues for FTLD-TDP and related progranulin-dependent diseases.

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Area of Science:

  • Neuroscience
  • Genetics
  • Molecular Biology

Background:

  • Frontotemporal lobar degeneration (FTLD) is a prevalent neurodegenerative disorder affecting individuals under 65.
  • FTLD with TAR DNA-binding protein 43 inclusions (FTLD-TDP) is the most common pathological subtype.
  • Genetic factors significantly contribute to FTLD, with approximately 50% of cases having a family history.

Purpose of the Study:

  • To review the role of genetic studies in identifying progranulin regulators.
  • To highlight the importance of progranulin in FTLD-TDP pathogenesis.
  • To emphasize the need for further research into genetic and cellular mechanisms for FTLD treatment.

Main Methods:

  • Review of genetic studies, including pathogenic GRN mutations and risk variants.
  • Analysis of genetic variants in transmembrane protein 106B (TMEM106B) and their association with FTLD-TDP risk.
  • Identification of sortilin as a potential progranulin receptor.

Main Results:

  • Mutations in the progranulin gene (GRN) cause FTLD-TDP via progranulin haploinsufficiency.
  • Genetic variants, such as those in TMEM106B, are linked to FTLD-TDP risk, potentially by modulating progranulin levels.
  • Sortilin has been identified as a potential receptor involved in progranulin regulation.

Conclusions:

  • Genetic studies are crucial for understanding progranulin's role in FTLD.
  • Identifying progranulin regulators is essential for developing novel therapies for FTLD and related disorders.
  • Continued genetic and cell biology research is vital for finding cures for progranulin-related diseases.