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Circulating Differentially Methylated Amylin DNA as a Biomarker of β-Cell Loss in Type 1 Diabetes

John A Olsen1, Lauren A Kenna1, Michael G Spelios1

  • 1Research Institute, Islet Biology, Winthrop-University Hospital, Mineola, NY, United States of America.

Plos One
|April 26, 2016
PubMed

Insights

Demethylated amylin circulating DNA (cfDNA) shows promise as a biomarker for detecting silent beta-cell loss in type 1 diabetes (T1D). This novel biomarker may detect cell death when insulin markers are undetectable.

Area of Science:

  • Endocrinology
  • Molecular Biology
  • Genetics

Background:

  • Type 1 diabetes (T1D) involves silent beta-cell destruction, necessitating reliable biomarkers for disease monitoring.
  • Current biomarkers may not fully capture the extent of beta-cell loss during T1D progression.

Purpose of the Study:

  • To investigate demethylated circulating free amylin DNA (cfDNA) as a specific biomarker for beta-cell death in T1D.
  • To evaluate the utility of amylin cfDNA in detecting beta-cell loss, potentially complementing existing markers like insulin cfDNA.

Main Methods:

  • Utilized methylation-sensitive quantitative real-time PCR (qPCR) with methylation-specific primers.
  • Analyzed DNA from murine and human islets, enriched beta-cells, and sera from non-obese diabetic (NOD) mice and T1D patients.
  • Compared amylin cfDNA levels with insulin cfDNA and controls.

Main Results:

  • Identified unique methylation patterns in the amylin coding region of beta-cells.
  • Demonstrated high levels of demethylated amylin DNA in isolated human and murine beta-cells.
  • Observed increased demethylated amylin cfDNA in NOD mice during T1D progression and in recent-onset T1D patients compared to controls.
  • Showed that amylin cfDNA levels did not correlate directly with insulin cfDNA, suggesting independent detection capabilities.

Conclusions:

  • Demethylated amylin cfDNA is a sensitive indicator of beta-cell-derived DNA, reflecting beta-cell death in T1D.
  • Amylin cfDNA serves as a valuable biomarker for detecting beta-cell loss, especially when insulin markers are low or undetectable.
  • Combining amylin and insulin cfDNA assays offers a comprehensive multi-gene approach for assessing beta-cell loss in T1D.

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