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Proc Natl Acad Sci U S A. 2011 Nov 22;108(47):19018-23. doi: 10.1073/pnas.1111008108. Epub 2011 Nov 9.

Detection of β cell death in diabetes using differentially methylated circulating DNA.

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  • 1Department of Immunobiology and Internal Medicine, Yale University School of Medicine, New Haven, CT 06511, USA.

Abstract

In diabetes mellitus, β cell destruction is largely silent and can be detected only after significant loss of insulin secretion capacity. We have developed a method for detecting β cell death in vivo by amplifying and measuring the proportion of insulin 1 DNA from β cells in the serum. By using primers that are specific for DNA methylation patterns in β cells, we have detected circulating copies of β cell-derived demethylated DNA in serum of mice by quantitative PCR. Accordingly, we have identified a relative increase of β cell-derived DNA after induction of diabetes with streptozotocin and during development of diabetes in nonobese diabetic mice. We have extended the use of this assay to measure β cell-derived insulin DNA in human tissues and serum. We found increased levels of demethylated insulin DNA in subjects with new-onset type 1 diabetes compared with age-matched control subjects. Our method provides a noninvasive approach for detecting β cell death in vivo that may be used to track the progression of diabetes and guide its treatment.

PMID:
22074781
[PubMed - indexed for MEDLINE]
PMCID:
PMC3223447
Free PMC Article

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