A Knock-In Tristetraprolin (TTP) Zinc Finger Point Mutation in Mice: Comparison with Complete TTP Deficiency
| Autor: | Deborah J. Stumpo, Roberta Faccio, Perry J. Blackshear, Lian-Qun Qiu, Wi S. Lai |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
0301 basic medicine
RNA Stability Mutant Tristetraprolin RNA-binding protein Biology 03 medical and health sciences Mice 0302 clinical medicine hemic and lymphatic diseases Animals Humans Point Mutation Amino Acid Sequence Gene Knock-In Techniques RNA Messenger Molecular Biology AU-rich element Zinc finger AU Rich Elements Mice Knockout Messenger RNA RNA Zinc Fingers Cell Biology respiratory system Molecular biology Mice Inbred C57BL 030104 developmental biology 030220 oncology & carcinogenesis Knockout mouse Mutation Research Article |
| Popis: | Tristetraprolin (TTP) is a tandem CCCH zinc finger protein that can bind to AU-rich element-containing mRNAs and promote their decay. TTP knockout mice develop a severe inflammatory syndrome, largely due to excess tumor necrosis factor (TNF), whose mRNA is a direct target of TTP binding and destabilization. TTP's RNA binding activity and its ability to promote mRNA decay are lost when one of the zinc-coordinating residues of either zinc finger is mutated. To address several long-standing questions about TTP activity in intact animals, we developed a knock-in mouse with a cysteine-to-arginine mutation within the first zinc finger. Homozygous knock-in mice developed a severe inflammatory syndrome that was essentially identical to that of complete TTP deficiency, suggesting that TTP's critical anti-inflammatory role in mammalian physiology is secondary to its ability to bind RNA. In addition, there was no evidence for a "dominant-negative" effect of the mutant allele in heterozygotes, as suggested by previous experiments. Finally, mRNA decay experiments in mutant macrophages demonstrated that TTP can regulate the stability of its own mRNA, albeit to a minor extent. These studies suggest that RNA binding is an essential first step in the physiological activities of members of this protein family. |
| Databáze: | OpenAIRE |
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