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- W2139797302 abstract "Zmpste24 is a metalloproteinase required for the processing of prelamin A to lamin A, a structural component of the nuclear lamina. Zmpste24 deficiency results in the accumulation of prelamin A within cells, a complete loss of mature lamin A, and misshapen nuclear envelopes. Zmpste24 -deficient ( Zmpste24 –/– ) mice exhibit retarded growth, alopecia, micrognathia, dental abnormalities, osteolytic lesions in bones, and osteoporosis, which are phenotypes shared with Hutchinson–Gilford progeria syndrome, a human disease caused by the synthesis of a mutant prelamin A that cannot undergo processing to lamin A. Zmpste24 –/– mice also develop muscle weakness. We hypothesized that prelamin A might be toxic and that its accumulation in Zmpste24 –/– mice is responsible for all of the disease phenotypes. We further hypothesized that Zmpste24 –/– mice with half-normal levels of prelamin A ( Zmpste24 –/– mice with one Lmna knockout allele) would be subjected to less toxicity and be protected from disease. Thus, we bred and analyzed Zmpste24 –/– Lmna +/– mice. As expected, prelamin A levels in Zmpste24 –/– Lmna +/– cells were significantly reduced. Zmpste24 –/– Lmna +/– mice were entirely normal, lacking all disease phenotypes, and misshapen nuclei were less frequent in Zmpste24 –/– Lmna +/– cells than in Zmpste24 –/– cells. These data suggest that prelamin A is toxic and that reducing its levels by as little as 50% provides striking protection from disease." @default.
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- W2139797302 date "2004-12-17" @default.
- W2139797302 modified "2023-10-06" @default.
- W2139797302 title "Heterozygosity for <i>Lmna</i> deficiency eliminates the progeria-like phenotypes in <i>Zmpste24</i> -deficient mice" @default.
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- W2139797302 doi "https://doi.org/10.1073/pnas.0408558102" @default.
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