Liver growth in the embryo and during liver regeneration in zebrafish requires the cell cycle regulator, uhrf1.
In contrast to the deregulated hepatocellular division that is a feature of many hepatic diseases and malignancies, physiologic liver growth during embryonic development and after partial hepatectomy (PH) in adults is characterized by tightly controlled cell proliferation. We used forward genetic screening in zebrafish to test the hypothesis that a similar genetic program governs physiologic liver growth during hepatogenesis and regeneration after PH. We identified the uhrf1 gene, a cell cycle regulator and transcriptional activator of top2a expression, as required for hepatic outgrowth and embryonic survival. By developing a methodology to perform PH on adult zebrafish, we found that liver regeneration inuhrf1+/- adult animals is impaired.uhrf1 transcript levels dramatically increase after PH in both mice, and zebrafish and top2a is not up-regulated in uhrf1+/- livers after PH. This indicates that uhrf1 is required for physiologic liver growth in both embryos and adults and illustrates that zebrafish livers regenerate.
Sadler
Kirsten C
KC
Division of Gastroenterology, Department of Medicine, Brigham and Women's Hospital, Boston, MA 02115, USA. kirsten.edepli@mssm.edu
Krahn
Katherine N
KN
Gaur
Naseem A
NA
Ukomadu
Chinweike
C
D000818:Animals; D030801:Animals, Genetically Modified; D022762:CCAAT-Enhancer-Binding Proteins / Q000378:metabolism / Q000502:physiology*; D002453:Cell Cycle; D049109:Cell Proliferation; D019925:Cyclin A / Q000502:physiology; D056751:Cyclin A2; D018507:Gene Expression Regulation, Developmental; D017403:In Situ Hybridization; D008099:Liver / Q000033:anatomy & histology / Q000196:embryology* / Q000378:metabolism / Q000502:physiology*; D008115:Liver Regeneration; D051379:Mice; D009154:Mutation; D013997:Time Factors; D015534:Trans-Activators / Q000096:biosynthesis* / Q000502:physiology*; D015027:Zebrafish; D029961:Zebrafish Proteins / Q000096:biosynthesis* / Q000502:physiology*
D022762:CCAAT-Enhancer-Binding Proteins; D019925:Cyclin A; D056751:Cyclin A2; D015534:Trans-Activators; C517793:Uhrf1 protein, zebrafish; D029961:Zebrafish Proteins; C503723:ccna2 protein, zebrafish