Epigenetic clocks based on tissue DNA methylation analysis have emerged as robust and powerful biomarkers of aging.  This technology has allowed scientists to investigate how diseases affect the aging process, to evaluate the effectiveness of therapeutic aging interventions, and to correlate age with overall health among the general public. Today you can even purchase test kits online that enable you to measure your own biological age.  However, despite the growing use of epigenetic clocks in research, surprisingly little is known about the aging clock’s cellular underpinnings. For example, it remains unclear whether all cells within a tissue exhibit the same epigenetic age, and whether age-related cellular heterogeneity within a tissue affects the epigenetic clock. This is particularly relevant in regenerative tissues maintained by a hierarchy of stem, progenitor, and differentiated cells, all of which may change their frequencies within a tissue with age. The guests on today’s podcast tackle this important question through analyses of immature and mature cell populations from muscle, blood, and epithelia, using three different epigenetic clocks widely used in the field. They discuss their results, and the implications for the interpretation of existing clocks, and the development of more sensitive and accurate clocks. 

Guests
Konrad Hochedlinger, PhD, Massachusetts General Hospital and Harvard Stem Cell Institute, MA, USA

Rebecca Gorelov, PhD, Harvard Medical School, USA

Host
Martin Pera, Editor-in-Chief, Stem Cell Reports and The Jackson Laboratory
X: @martinperaJAX

Supporting Paper
Dissecting the impact of differentiation stage, replicative history, and cell type composition in epigenetic clocks, Stem Cell Reports

 About Stem Cell Reports
Stem Cell Reports is the open access, peer-reviewed journal of the International Society for Stem Cell Research (ISSCR) for communicating basic discoveries in stem cell research, in addition to translational and clinical studies. Stem Cell Reports focuses on original research with conceptual or practical advances that are of broad interest to stem cell biologists and clinicians.
X: @StemCellReports

About ISSCR
With nearly 5,000 members from 75+ countries, the International Society for Stem Cell Research (@ISSCR) is the preeminent global, cross-disciplinary, science-based organization dedicated to stem cell research and its translation to the clinic. The ISSCR mission is to promote excellence in stem cell science and applications to human health.

ISSCR Staff
Keith Alm, Chief Executive Officer
Yvonne Fisher, Managing Editor, Stem Cell Reports
Kym Kilbourne, Director of Media and Strategic Communications
Jack Mosher, Scientific Advisor

Voice Work
Ben Snitkoff