46 research outputs found

    Generation of a fluorescent PI(3,4,5)P3 sensorΒ C. elegans

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    The role of RNA quality control via nonsense-mediated mRNA decay in longevity of C. elegans

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    Doctorλ…Έν™”κ°€ μ§„ν–‰λœ 개체의 경우 DNA와 λ‹¨λ°±μ§ˆμ— 변이가 μƒκΈ°κ±°λ‚˜ κ·Έ κΈ°λŠ₯이 μ €ν•˜λ˜μ–΄ μžˆλ‹€. 그리고 DNA와 λ‹¨λ°±μ§ˆμ˜ μƒνƒœκ°€ λ‚˜λΉ μ§€λŠ” 것 λ˜ν•œ λ…Έν™”λ₯Ό μ΄‰μ§„ν•˜κ±°λ‚˜ μ§ˆλ³‘μ„ μ•ΌκΈ°ν•œλ‹€λŠ” 것이 잘 μ•Œλ €μ Έ μžˆμ—ˆλ‹€. ν•˜μ§€λ§Œ RNA의 ν’ˆμ§ˆμ΄ 노화에 따라 λ³€ν•˜λŠ”μ§€, ν˜Ήμ€ RNA ν’ˆμ§ˆ μœ μ§€κ΄€λ¦¬κ°€ 노화에 영ν–₯을 λΌμΉ˜λŠ”μ§€λŠ” 잘 μ•Œλ €μ Έ μžˆμ§€ μ•Šμ•˜λ‹€. μƒνƒœκ°€ λ‚˜λΉ μ§„ RNAλ‚˜ 잘λͺ» μƒμ„±λœ RNAλŠ” nonsense-mediated mRNA decay (NMD) μž‘μš©μ„ 톡해 λΆ„ν•΄λ˜μ–΄ μ—†μ–΄μ§μœΌλ‘œμ¨ RNA의 항상성이 μœ μ§€λœλ‹€. λ³Έ μ—°κ΅¬μ—μ„œλŠ” RNA μœ μ§€κ΄€λ¦¬μ— μ€‘μš”ν•œ NMD μž‘μš©μ΄ μ˜ˆμœκΌ¬λ§ˆμ„ μΆ©μ˜ μž₯수 λͺ¨λΈμΈ DAF-2/인슐린 수용체 λŒμ—°λ³€μ΄μ˜ 수λͺ…증가에 ν•„μˆ˜μ μ΄λΌλŠ” 것을 μƒˆλ‘­κ²Œ λ°ν˜”λ‹€. DAF-2의 κΈ°λŠ₯이 μ €ν•˜λμ„ λ•Œ NMD의 ν™œμ„±μ΄ μ¦κ°€ν•˜μ˜€κ³ , 이λ₯Ό 톡해 ν•΄λ‘œμšΈ 수 μžˆλŠ” 잘λͺ»λœ RNAκ°€ λΆ„ν•΄λ˜μ–΄ μ—†μ–΄μ‘Œλ‹€. λ˜ν•œ, NMD 볡합체λ₯Ό κ΅¬μ„±ν•˜λŠ” μ€‘μš”ν•œ λ‹¨λ°±μ§ˆμΈ SMG-2/UPF1이 DAF-2/인슐린 수용체 λŒμ—°λ³€μ΄λΏλ§Œ μ•„λ‹ˆλΌ λ‹€λ₯Έ μž₯수 λͺ¨λΈ κΌ¬λ§ˆμ„ μΆ©μ˜ 수λͺ…μ—°μž₯에 ν•„μš”ν•˜λ‹€λŠ” 것을 μ•Œμ•„λƒ„μœΌλ‘œμ¨ SMG/UPF1을 ν†΅ν•œ NMDκ°€ λ‹€μ–‘ν•œ 방법을 ν†΅ν•œ 수λͺ… μ—°μž₯에 μ€‘μš”ν•œ 역할을 ν•  수 μžˆλ‹€λŠ” 것을 μ•Œμ•„λƒˆλ‹€. λ”λΆˆμ–΄, 특히 μ‹ κ²½μ„Έν¬μ˜ NMDκ°€ 수λͺ…에 μ€‘μš”ν•œ κ²ƒμœΌλ‘œ λ‚˜νƒ€λ‚¬κ³ , NMD 타깃인 YARS-2/tyrosyl tRNA synthetase RNA의 양이 μ€„μ–΄λ“œλŠ” 것이 DAF-2/인슐린 수용체 λŒμ—°λ³€μ΄μ˜ μž₯μˆ˜μ— ν•„μˆ˜μ μ΄λΌλŠ” 것을 λ³΄μ˜€λ‹€. 이 μ—°κ΅¬λŠ” NMDλ₯Ό ν†΅ν•œ RNA ν•­μƒμ„±μ‘°μ ˆμ΄ DAF-2/인슐린 수용체 λŒμ—°λ³€μ΄μ˜ μž₯μˆ˜μ— μ€‘μš”ν•˜λ‹€λŠ” 것을 처음으둜 λ°ν˜”μœΌλ©°, 고등동물도 NMD μž‘μš©μ„ 가지고 μžˆλ‹€λŠ” μ‚¬μ‹€λ‘œ λ³Ό λ•Œ, NMDλ₯Ό ν†΅ν•œ RNA의 질적 μœ μ§€κ΄€λ¦¬κ°€ μΈκ°„μ˜ μž₯μˆ˜μ—λ„ μ€‘μš”ν•œ 역할을 ν•  수 μžˆλ‹€λŠ” κ°€λŠ₯성을 μ œμ‹œν•˜μ˜€λ‹€.The requirement for protein and DNA homeostasis in longevity is well known. However, the role of RNA quality control in aging remains unexplored. Here, we show that nonsense-mediated mRNA decay (NMD), which degrades abnormal transcripts as well as some normal transcripts, promotes longevity by enhancing RNA surveillance in C. elegans. We found that long-lived daf-2/insulin/insulin-like growth factor 1 (IGF-1) receptor mutants displayed enhanced NMD activity and reduced levels of potentially aberrant transcripts. NMD components, including smg-2/UPF1, were required for the long lifespan of daf-2 mutants. In addition, smg-2/UPF1 was required for dietary restriction (eat-2), germline loss (glp-1), and mitochondrial mutant (isp-1) longevity, suggesting that NMD is generally important for maintenance of biological function with age. NMD in the nervous system of the animals was particularly important for RNA homeostasis to promote longevity. We propose that up-regulation of NMD activity contributes to long lifespan caused by reduced insulin/IGF-1 signaling, and that NMD-mediated RNA surveillance is a crucial homeostatic process that contributes to organismal longevity

    Fluorescent sensor that monitors subcellular localization of PI(3,4,5)P3 in C. elegans

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