Allele-specific methylation at the promoter-associated CpG island of mouse Copg2

Allele-specific methylation at the promoter-associated CpG island of mouse Copg2 We previously reported that the mouse Copg2 (Coatomer Protein Subunit Gamma 2) gene was imprinted in the intraspecific F1 hybrid mice between C57BL/6 and M. m. molossinus. In this study, methylation status at the promoter-associated CpG island and allele-specific expression pattern of Copg2 were investigated in the interspecific F1 hybrid (C57BL/6 × M. spretus). We found that Copg2 was biallelically expressed in the interspecific F1 hybrid, despite the presence of a differentially methylated region (DMR) in the CpG island. Therefore, paternalspecific methylation at the CpG island of Copg2 is not accompanied by allele-specific expression of Copg2 in the F1 hybrid (C57BL/6 × M. spretus). The results suggest that the imprinted pattern of Copg2 expression is subject to variable epigenetic control systems of different mouse species. In addition, we identified a novel antisense transcript, Copg2AS2, at the Copg2 promoter region. The antisense transcript was expressed monoallelically, indicating that the differential expression of the antisense transcript is correlated with the differential methylation at the CpG island of Copg2. Mammalian Genome Springer Journals

Allele-specific methylation at the promoter-associated CpG island of mouse Copg2

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Copyright © 2003 by Springer-Verlag
Life Sciences; Cell Biology; Anatomy; Zoology
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