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Modified Yeast-Two-Hybrid System to Identify Proteins Interacting with the Growth Factor Progranulin
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Gene expression study on peripheral blood identifies progranulin mutations.

Giovanni Coppola1, Anna Karydas, Rosa Rademakers

  • 1Department of Neurology, Program in Neurogenetics, David Geffen School of Medicine, University of California at Los Angeles, Los Angeles, CA 90095, USA.

Annals of Neurology
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Peripheral blood progranulin (PGRN) levels can help screen for PGRN mutations. Higher PGRN messenger RNA in Alzheimer's patients suggests PGRN’s role in the disease.

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Area of Science:

  • Neuroscience
  • Genetics
  • Biochemistry

Background:

  • Peripheral blood offers a noninvasive method for screening various medical conditions.
  • Progranulin (PGRN) is a protein with potential implications in neurodegenerative diseases.

Purpose of the Study:

  • To evaluate total-blood progranulin (PGRN) levels as a potential diagnostic marker.
  • To investigate the association between PGRN levels, PGRN gene mutations, and Alzheimer's disease.

Main Methods:

  • Screening of total-blood PGRN levels in 107 patients with neurodegenerative dementias and 36 controls.
  • Confirmation of PGRN gene mutations via direct sequencing in subjects with reduced PGRN levels.
  • Quantification of PGRN messenger RNA (mRNA) levels.

Main Results:

  • High progranulin expression levels were confirmed in peripheral blood.
  • Two subjects exhibited reduced PGRN levels and confirmed PGRN gene mutations.
  • Elevated PGRN mRNA levels were observed in patients clinically diagnosed with Alzheimer's disease.

Conclusions:

  • Peripheral blood PGRN quantification serves as a proof-of-principle for screening PGRN mutations.
  • Progranulin may play a significant role in the pathogenesis of Alzheimer's disease.
  • This study supports exploring blood PGRN levels for neurodegenerative disease diagnostics.