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Molecular and Cellular Biology, May 2004, p. 3588-3595, Vol. 24, No. 9
0270-7306/04/$08.00+0     DOI: 10.1128/MCB.24.9.3588-3595.2004

The H19 Differentially Methylated Region Marks the Parental Origin of a Heterologous Locus without Gametic DNA Methylation

Kye-Yoon Park, Elizabeth A. Sellars, Alexander Grinberg, Sing-Ping Huang, and Karl Pfeifer*

Laboratory of Mammalian Genes and Development, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland 20892

Received 18 November 2003/ Returned for modification 24 December 2003/ Accepted 30 January 2004

Igf2 and H19 are coordinately regulated imprinted genes physically linked on the distal end of mouse chromosome 7. Genetic analyses demonstrate that the differentially methylated region (DMR) upstream of the H19 gene is necessary for three distinct functions: transcriptional insulation of the maternal Igf2 allele, transcriptional silencing of paternal H19 allele, and marking of the parental origin of the two chromosomes. To test the sufficiency of the DMR for the third function, we inserted DMR at two heterologous positions in the genome, downstream of H19 and at the alpha-fetoprotein locus on chromosome 5. Our results demonstrate that the DMR alone is sufficient to act as a mark of parental origin. Moreover, this activity is not dependent on germ line differences in DMR methylation. Thus, the DMR can mark its parental origin by a mechanism independent of its own DNA methylation.

* Corresponding author. Mailing address: Laboratory of Mammalian Genes and Development, NICHD/NIH, Building 6B, Room 2B206, 9000 Rockville Pike, Bethesda MD 20892. Phone: (301) 402-0676. Fax: (301) 402-0543. E-mail: kpfeifer{at}helix.nih.gov.

Molecular and Cellular Biology, May 2004, p. 3588-3595, Vol. 24, No. 9
0022-538X/04/$08.00+0     DOI: 10.1128/MCB.24.9.3588-3595.2004




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