1. Abnormal nuclear morphology is independent of longevity in a zmpste24-deficient fish model of Hutchinson-Gilford progeria syndrome (HGPS).
- Author
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Tonoyama Y, Shinya M, Toyoda A, Kitano T, Oga A, Nishimaki T, Katsumura T, Oota H, Wan MT, Yip BWP, Helen MOL, Chisada S, Deguchi T, Au DWT, Naruse K, Kamei Y, and Taniguchi Y
- Subjects
- Animal Fins enzymology, Animal Fins pathology, Animal Fins radiation effects, Animals, Animals, Genetically Modified, Cell Nucleus enzymology, Cell Nucleus radiation effects, Cell Nucleus Shape radiation effects, Cells, Cultured, Codon, Nonsense, Female, Fish Proteins chemistry, Fish Proteins genetics, Fish Proteins metabolism, Gene Knockout Techniques, Green Fluorescent Proteins chemistry, Green Fluorescent Proteins genetics, Green Fluorescent Proteins metabolism, Heterozygote, Male, Membrane Proteins genetics, Membrane Proteins metabolism, Metalloendopeptidases genetics, Metalloendopeptidases metabolism, Oryzias metabolism, Progeria enzymology, Progeria genetics, Radiation Tolerance, Recombinant Fusion Proteins chemistry, Recombinant Fusion Proteins genetics, Recombinant Fusion Proteins metabolism, Survival Analysis, Telomere Shortening radiation effects, Cell Nucleus pathology, Disease Models, Animal, Fish Proteins deficiency, Membrane Proteins deficiency, Metalloendopeptidases deficiency, Oryzias genetics, Progeria pathology
- Abstract
Lamin is an intermediate protein underlying the nuclear envelope and it plays a key role in maintaining the integrity of the nucleus. A defect in the processing of its precursor by a metalloprotease, ZMPSTE24, results in the accumulation of farnesylated prelamin in the nucleus and causes various diseases, including Hutchinson-Gilford progeria syndrome (HGPS). However, the role of lamin processing is unclear in fish species. Here, we generated zmpste24-deficient medaka and evaluated their phenotype. Unlike humans and mice, homozygous mutants did not show growth defects or lifespan shortening, despite lamin precursor accumulation. Gonadosomatic indices, blood glucose levels, and regenerative capacity of fins were similar in 1-year-old mutants and their wild-type (WT) siblings. Histological examination showed that the muscles, subcutaneous fat tissues, and gonads were normal in the mutants at the age of 1 year. However, the mutants showed hypersensitivity to X-ray irradiation, although p53target genes, p21 and mdm2, were induced 6 h after irradiation. Immunostaining of primary cultured cells from caudal fins and visualization of nuclei using H2B-GFP fusion proteins revealed an abnormal nuclear shape in the mutants both in vitro and in vivo. The telomere lengths were significantly shorter in the mutants compared to WT. Taken together, these results suggest that zmpste24-deficient medaka phenocopied HGPS only partially and that abnormal nuclear morphology and lifespan shortening are two independent events in vertebrates., (Copyright © 2018 The Author(s). Published by Elsevier Inc. All rights reserved.)
- Published
- 2018
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