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Annotation

Kaminsky ZA, Tang T, Wang SC, Ptak C, Oh GH, Wong AH, Feldcamp LA, Virtanen C, Halfvarson J, Tysk C, McRae AF, Visscher PM, Montgomery GW, Gottesman II, Martin NG, Petronis A. DNA methylation profiles in monozygotic and dizygotic twins. Nat Genet . 2009 Jan 18 ; PubMed Abstract

Comments on Paper and Primary News
Primary News: Epigenetic Forces May Blaze Divergent Heritable Paths From Same DNA

Comment by:  Shiva SinghRichard O'Reilly
Submitted 2 February 2009 Posted 3 February 2009

The methylation difference between twins is clearly demonstrated using newer methods in this publication. However, conceptually it’s an old story now. A quick PubMed search for "monozygotic twins and non-identical" yielded a total of 7,653 publications. There is no doubt that the more we look, the more difference we will find between monozygotic twins. Also, monozygotic twin differences in methylation and gene expression are expected to increase with age. It is also affected by a variety of genetic and environmental factors. We have come a long way in genetic research on twins and the time has come to modify our thinking about monozygotic twins as "non-identical but closest possible" rather than as "identical." They started from a single zygote, but have diverged during development and differentiation including upbringing.

The implication of the published results is that the methylation (epigenetic) differences (in monozygotic twins) will be powerful in any genetic analysis of disease(s). Once again, it is probably more problematic than usually assumed. Also, it is...  Read more


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