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From The Cover
BIOLOGICAL SCIENCES / GENETICS
Germ-line epigenetic modification of the murine A^vy allele by nutritional supplementation

Jennifer E. Cropley^*,, Catherine M. Suter^*,, Kenneth B. Beckman, and David I. K. Martin^*,,,¶

*Victor Chang Cardiac Research Institute, 384 Victoria Street, Darlinghurst 2010, Sydney, Australia; School of Biotechnology and Biomolecular Sciences and Faculty of Medicine, University of New South Wales, Anzac Parade, Kensington 2033, Sydney, Australia; and Children's Hospital Oakland Research Institute, 5700 Martin Luther King Junior Way, Oakland, CA 94609

Edited by Mark T. Groudine, Fred Hutchinson Cancer Research Center, Seattle, WA, and approved September 27, 2006 (received for review August 16, 2006)

Environmental effects on phenotype can be mediated by epigenetic modifications. The epigenetic state of the murine A^vy allele is highly variable, and determines phenotypic effects that vary in a mosaic spectrum that can be shifted by in utero exposure to methyl donor supplementation. We have asked if methyl donor supplementation affects the germ-line epigenetic state of the A^vy allele. We find that the somatic epigenetic state of A^vy is affected by in utero methyl donor supplementation only when the allele is paternally contributed. Exposure to methyl donor supplementation during midgestation shifts A^vy phenotypes not only in the mice exposed as fetuses, but in their offspring. This finding indicates that methyl donors can change the epigenetic state of the A^vy allele in the germ line, and that the altered state is retained through the epigenetic resetting that takes place in gametogenesis and embryogenesis. Thus a mother's diet may have an enduring influence on succeeding generations, independent of later changes in diet. Although other reports have suggested such heritable epigenetic changes, this study demonstrates that a specific mammalian gene can be subjected to germ-line epigenetic change.

agouti | inheritance

The authors declare no conflict of interest.

See Commentary on page 17071.

This article is a PNAS direct submission.

^¶To whom correspondence should be addressed. E-mail: dimartin{at}chori.org

© 2006 by The National Academy of Sciences of the USA

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Related Commentary in PNAS:

Germ cells carry the epigenetic benefits of grandmother's diet

Craig A. Cooney
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