Epigenetic and phenotypic consequences of a truncation disrupting the imprinted domain on distal mouse chromosome 7

Rosemary Oh, Rita Ho, Lynn Mar, Marina Gertsenstein, Jana Paderova, John Hsien, Jeremy A. Squire, Michael J. Higgins, Andras Nagy, Louis Lefebvre

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13 Citations (Scopus)

Abstract

The distal end of mouse chromosome 7 (Chr 7) contains a large cluster of imprinted genes. In this region two ds-acting imprinting centers, IC1 (H19 DMR) and IC2 (KvDMR1), define proximal and distal subdo mains, respectively. To assess the functional independence of IC1 in the context of Chr 7, we developed a recombinase-mediated chromosome truncation strategy in embryonic stem cells and generated a terminal deletion allele, DelTel7, with a breakpoint in between the two subdomains. We obtained germ line transmission of the truncated Chr 7 and viable paternal heterozygotes, confirming the absence of developmentally required paternally expressed genes distal of Ins2. Conversely, maternal transmission of DelTel7 causes a midgesta tional lethality, consistent with loss of maternally expressed genes in the IC2 subdomain. Expression and DNA methylation analyses on DelTel7 heterozygotes demonstrate the independent imprinting of IC1 in absence of the entire IC2 subdomain. The evolutionarily conserved linkage between the subdomains is therefore not required for IC1 imprinting on Chr 7. Importantly, the developmental phenotype of maternal heterozygotes is rescued fully by a paternally inherited deletion of IC2. Thus, all the imprinted genes located in the region and required for normal development are silenced by an IC2-dependent mechanism on the paternal allele.

Original languageEnglish
Pages (from-to)1092-1103
Number of pages12
JournalMolecular and Cellular Biology
Volume28
Issue number3
DOIs
Publication statusPublished - Feb 2008
Externally publishedYes

Cite this

Oh, R., Ho, R., Mar, L., Gertsenstein, M., Paderova, J., Hsien, J., Squire, J. A., Higgins, M. J., Nagy, A., & Lefebvre, L. (2008). Epigenetic and phenotypic consequences of a truncation disrupting the imprinted domain on distal mouse chromosome 7. Molecular and Cellular Biology, 28(3), 1092-1103. https://doi.org/10.1128/MCB.01019-07