Abstract
The imprinted H19 gene produces a noncoding RNA of unknown function. Targeted and transgenic mouse mutations have shown that this RNA can be deleted and overexpressed without adverse effect. Yet one mutation of the H19 gene displayed an embryonic lethal phenotype in the mouse—the expression of an RNA modified by a short insertion near the 5′ end of the transcript (H19Xba allele). Expression of this RNA in transgenic mice conferred lethality at day 14 of development. The potential for this mutant to elucidate the function of the H19 RNA supported further investigation of the H19Xba phenotype. Since all H19Xba transgenic founders died as embryos, an experiment was designed to generate H19Xba-expressing mice that could be maintained as an established line. This strategy took advantage of the maternal-specific expression of H19, passing an H19Xba knockin allele silently through males and transferring it to females only to generate animals for study. Surprisingly, H19Xba knockin mice are fully viable, whether the H19Xba allele is inherited paternally or maternally. Experiments to reproduce the original transgene-based lethality were also performed and yielded live-born transgene-expressing animals. These data demonstrate that, contrary to published reports, expression of the H19Xba RNA does not cause embryonic lethality in mice.
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Notes
By convention, when superscripts are used to indicate the two alleles of a heterozygous animal, the maternally inherited allele is listed first.
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Acknowledgments
The authors thank Shirley Tilghman, Mary Brunkow, Angela Tyner, and Teresa Orenic for comments on the manuscript, and Roberta Franks and Melissa Kaczmarczyk of the UIC Transgenic Production Service for transgene injections. This research was supported by a Kimmel Scholar Award from the Sidney Kimmel Foundation for Cancer Research, and by grant HD042013 from the National Institutes of Health, both to JVS.
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Carr, M.S., Getek, K.A., Levorse, J.M. et al. Expression of a modified H19 RNA does not cause embryonic lethality in mice. Mamm Genome 17, 5–13 (2006). https://doi.org/10.1007/s00335-005-0092-1
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DOI: https://doi.org/10.1007/s00335-005-0092-1